[PATCH v12 00/18] kunit: introduce KUnit, the Linux kernel unit testing framework

[PATCH v12 00/18] kunit: introduce KUnit, the Linux kernel unit testing framework

[Brendan Higgins]

## TL;DR

This revision removes dependence on kunit_stream in favor of
kunit_assert, as suggested by Stephen Boyd. kunit_assert provides a more
structured interface for constructing messages and allows most required
data to be stored on the stack for most expectations until it is
determined that a failure message must be produced.

As a part of introducing kunit_assert, expectations (KUNIT_EXPECT_*) and
assertions (KUNIT_ASSERT_*) have been substantially refactored.
Nevertheless, behavior should be the same.

As this revision, adds a new patch, it, [PATCH v12 04/18], needs to be
reviewed. All other patches have appropriate reviews and acks.

I also rebased the patchset on v5.3-rc3.

## Background

This patch set proposes KUnit, a lightweight unit testing and mocking
framework for the Linux kernel.

Unlike Autotest and kselftest, KUnit is a true unit testing framework;
it does not require installing the kernel on a test machine or in a VM
(however, KUnit still allows you to run tests on test machines or in VMs
if you want[1]) and does not require tests to be written in userspace
running on a host kernel. Additionally, KUnit is fast: From invocation
to completion KUnit can run several dozen tests in about a second.
Currently, the entire KUnit test suite for KUnit runs in under a second
from the initial invocation (build time excluded).

KUnit is heavily inspired by JUnit, Python's unittest.mock, and
Googletest/Googlemock for C++. KUnit provides facilities for defining
unit test cases, grouping related test cases into test suites, providing
common infrastructure for running tests, mocking, spying, and much more.

### What's so special about unit testing?

A unit test is supposed to test a single unit of code in isolation,
hence the name. There should be no dependencies outside the control of
the test; this means no external dependencies, which makes tests orders
of magnitudes faster. Likewise, since there are no external dependencies,
there are no hoops to jump through to run the tests. Additionally, this
makes unit tests deterministic: a failing unit test always indicates a
problem. Finally, because unit tests necessarily have finer granularity,
they are able to test all code paths easily solving the classic problem
of difficulty in exercising error handling code.

### Is KUnit trying to replace other testing frameworks for the kernel?

No. Most existing tests for the Linux kernel are end-to-end tests, which
have their place. A well tested system has lots of unit tests, a
reasonable number of integration tests, and some end-to-end tests. KUnit
is just trying to address the unit test space which is currently not
being addressed.

### More information on KUnit

There is a bunch of documentation near the end of this patch set that
describes how to use KUnit and best practices for writing unit tests.
For convenience I am hosting the compiled docs here[2].

Additionally for convenience, I have applied these patches to a
branch[3]. The repo may be cloned with:
git clone https://kunit.googlesource.com/linux
This patchset is on the kunit/rfc/v5.3/v12 branch.

## Changes Since Last Version

- Dropped patch "[PATCH v11 04/18] kunit: test: add kunit_stream a
  std::stream like logger" and replaced it with "[PATCH v12 04/18]
  kunit: test: add assertion printing library", which provides a totally
  new mechanism for constructing expectation/assertion failure messages.
- Substantially refactored expectations and assertions definitions in
  [PATCH 05/18] and [PATCH 11/18] respectively.
- Rebased patchset on v5.3-rc3.
- Fixed a minor documentation bug.

[1] https://google.github.io/kunit-docs/third_party/kernel/docs/usage.html#kunit-on-non-uml-architectures
[2] https://google.github.io/kunit-docs/third_party/kernel/docs/
[3] https://kunit.googlesource.com/linux/+/kunit/rfc/v5.3/v12

-- 
2.23.0.rc1.153.gdeed80330f-goog

[PATCH v12 01/18] kunit: test: add KUnit test runner core

[Brendan Higgins]

Add core facilities for defining unit tests; this provides a common way
to define test cases, functions that execute code which is under test
and determine whether the code under test behaves as expected; this also
provides a way to group together related test cases in test suites (here
we call them test_modules).

Just define test cases and how to execute them for now; setting
expectations on code will be defined later.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
---
 include/kunit/test.h | 179 ++++++++++++++++++++++++++++++++++++++++
 kunit/Kconfig        |  17 ++++
 kunit/Makefile       |   1 +
 kunit/test.c         | 191 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 388 insertions(+)
 create mode 100644 include/kunit/test.h
 create mode 100644 kunit/Kconfig
 create mode 100644 kunit/Makefile
 create mode 100644 kunit/test.c

diff --git a/include/kunit/test.h b/include/kunit/test.h
new file mode 100644
index 0000000000000..e0b34acb9ee4e
--- /dev/null
+++ b/include/kunit/test.h
@@ -0,0 +1,179 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Base unit test (KUnit) API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#ifndef _KUNIT_TEST_H
+#define _KUNIT_TEST_H
+
+#include <linux/types.h>
+
+struct kunit;
+
+/**
+ * struct kunit_case - represents an individual test case.
+ * @run_case: the function representing the actual test case.
+ * @name: the name of the test case.
+ *
+ * A test case is a function with the signature, ``void (*)(struct kunit *)``
+ * that makes expectations (see KUNIT_EXPECT_TRUE()) about code under test. Each
+ * test case is associated with a &struct kunit_suite and will be run after the
+ * suite's init function and followed by the suite's exit function.
+ *
+ * A test case should be static and should only be created with the KUNIT_CASE()
+ * macro; additionally, every array of test cases should be terminated with an
+ * empty test case.
+ *
+ * Example:
+ *
+ * .. code-block:: c
+ *
+ *	void add_test_basic(struct kunit *test)
+ *	{
+ *		KUNIT_EXPECT_EQ(test, 1, add(1, 0));
+ *		KUNIT_EXPECT_EQ(test, 2, add(1, 1));
+ *		KUNIT_EXPECT_EQ(test, 0, add(-1, 1));
+ *		KUNIT_EXPECT_EQ(test, INT_MAX, add(0, INT_MAX));
+ *		KUNIT_EXPECT_EQ(test, -1, add(INT_MAX, INT_MIN));
+ *	}
+ *
+ *	static struct kunit_case example_test_cases[] = {
+ *		KUNIT_CASE(add_test_basic),
+ *		{}
+ *	};
+ *
+ */
+struct kunit_case {
+	void (*run_case)(struct kunit *test);
+	const char *name;
+
+	/* private: internal use only. */
+	bool success;
+};
+
+/**
+ * KUNIT_CASE - A helper for creating a &struct kunit_case
+ * @test_name: a reference to a test case function.
+ *
+ * Takes a symbol for a function representing a test case and creates a
+ * &struct kunit_case object from it. See the documentation for
+ * &struct kunit_case for an example on how to use it.
+ */
+#define KUNIT_CASE(test_name) { .run_case = test_name, .name = #test_name }
+
+/**
+ * struct kunit_suite - describes a related collection of &struct kunit_case s.
+ * @name: the name of the test. Purely informational.
+ * @init: called before every test case.
+ * @exit: called after every test case.
+ * @test_cases: a null terminated array of test cases.
+ *
+ * A kunit_suite is a collection of related &struct kunit_case s, such that
+ * @init is called before every test case and @exit is called after every test
+ * case, similar to the notion of a *test fixture* or a *test class* in other
+ * unit testing frameworks like JUnit or Googletest.
+ *
+ * Every &struct kunit_case must be associated with a kunit_suite for KUnit to
+ * run it.
+ */
+struct kunit_suite {
+	const char name[256];
+	int (*init)(struct kunit *test);
+	void (*exit)(struct kunit *test);
+	struct kunit_case *test_cases;
+};
+
+/**
+ * struct kunit - represents a running instance of a test.
+ * @priv: for user to store arbitrary data. Commonly used to pass data created
+ * in the init function (see &struct kunit_suite).
+ *
+ * Used to store information about the current context under which the test is
+ * running. Most of this data is private and should only be accessed indirectly
+ * via public functions; the one exception is @priv which can be used by the
+ * test writer to store arbitrary data.
+ */
+struct kunit {
+	void *priv;
+
+	/* private: internal use only. */
+	const char *name; /* Read only after initialization! */
+	/*
+	 * success starts as true, and may only be set to false during a test
+	 * case; thus, it is safe to update this across multiple threads using
+	 * WRITE_ONCE; however, as a consequence, it may only be read after the
+	 * test case finishes once all threads associated with the test case
+	 * have terminated.
+	 */
+	bool success; /* Read only after test_case finishes! */
+};
+
+void kunit_init_test(struct kunit *test, const char *name);
+
+int kunit_run_tests(struct kunit_suite *suite);
+
+/**
+ * kunit_test_suite() - used to register a &struct kunit_suite with KUnit.
+ * @suite: a statically allocated &struct kunit_suite.
+ *
+ * Registers @suite with the test framework. See &struct kunit_suite for more
+ * information.
+ *
+ * NOTE: Currently KUnit tests are all run as late_initcalls; this means that
+ * they cannot test anything where tests must run at a different init phase. One
+ * significant restriction resulting from this is that KUnit cannot reliably
+ * test anything that is initialize in the late_init phase; another is that
+ * KUnit is useless to test things that need to be run in an earlier init phase.
+ */
+#define kunit_test_suite(suite)						       \
+		/*
+		 * TODO(brendanhiggins@google.com): Don't run all KUnit tests as
+		 * late_initcalls.  I have some future work planned to dispatch
+		 * all KUnit tests from the same place, and at the very least to
+		 * do so after everything else is definitely initialized.
+		 */							       \
+		static int kunit_suite_init##suite(void)		       \
+		{							       \
+			return kunit_run_tests(&suite);			       \
+		}							       \
+		late_initcall(kunit_suite_init##suite)
+
+void __printf(3, 4) kunit_printk(const char *level,
+				 const struct kunit *test,
+				 const char *fmt, ...);
+
+/**
+ * kunit_info() - Prints an INFO level message associated with the current test.
+ * @test: The test context object.
+ * @fmt: A printk() style format string.
+ *
+ * Prints an info level message associated with the test suite being run. Takes
+ * a variable number of format parameters just like printk().
+ */
+#define kunit_info(test, fmt, ...) \
+		kunit_printk(KERN_INFO, test, fmt, ##__VA_ARGS__)
+
+/**
+ * kunit_warn() - Prints a WARN level message associated with the current test.
+ * @test: The test context object.
+ * @fmt: A printk() style format string.
+ *
+ * Prints a warning level message.
+ */
+#define kunit_warn(test, fmt, ...) \
+		kunit_printk(KERN_WARNING, test, fmt, ##__VA_ARGS__)
+
+/**
+ * kunit_err() - Prints an ERROR level message associated with the current test.
+ * @test: The test context object.
+ * @fmt: A printk() style format string.
+ *
+ * Prints an error level message.
+ */
+#define kunit_err(test, fmt, ...) \
+		kunit_printk(KERN_ERR, test, fmt, ##__VA_ARGS__)
+
+#endif /* _KUNIT_TEST_H */
diff --git a/kunit/Kconfig b/kunit/Kconfig
new file mode 100644
index 0000000000000..330ae83527c23
--- /dev/null
+++ b/kunit/Kconfig
@@ -0,0 +1,17 @@
+#
+# KUnit base configuration
+#
+
+menu "KUnit support"
+
+config KUNIT
+	bool "Enable support for unit tests (KUnit)"
+	help
+	  Enables support for kernel unit tests (KUnit), a lightweight unit
+	  testing and mocking framework for the Linux kernel. These tests are
+	  able to be run locally on a developer's workstation without a VM or
+	  special hardware when using UML. Can also be used on most other
+	  architectures. For more information, please see
+	  Documentation/dev-tools/kunit/.
+
+endmenu
diff --git a/kunit/Makefile b/kunit/Makefile
new file mode 100644
index 0000000000000..5efdc4dea2c08
--- /dev/null
+++ b/kunit/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_KUNIT) +=			test.o
diff --git a/kunit/test.c b/kunit/test.c
new file mode 100644
index 0000000000000..d302cff0f1dc7
--- /dev/null
+++ b/kunit/test.c
@@ -0,0 +1,191 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Base unit test (KUnit) API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <linux/kernel.h>
+#include <kunit/test.h>
+
+static void kunit_set_failure(struct kunit *test)
+{
+	WRITE_ONCE(test->success, false);
+}
+
+static int kunit_vprintk_emit(int level, const char *fmt, va_list args)
+{
+	return vprintk_emit(0, level, NULL, 0, fmt, args);
+}
+
+static int kunit_printk_emit(int level, const char *fmt, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, fmt);
+	ret = kunit_vprintk_emit(level, fmt, args);
+	va_end(args);
+
+	return ret;
+}
+
+static void kunit_vprintk(const struct kunit *test,
+			  const char *level,
+			  struct va_format *vaf)
+{
+	kunit_printk_emit(level[1] - '0', "\t# %s: %pV", test->name, vaf);
+}
+
+static void kunit_print_tap_version(void)
+{
+	static bool kunit_has_printed_tap_version;
+
+	if (!kunit_has_printed_tap_version) {
+		kunit_printk_emit(LOGLEVEL_INFO, "TAP version 14\n");
+		kunit_has_printed_tap_version = true;
+	}
+}
+
+static size_t kunit_test_cases_len(struct kunit_case *test_cases)
+{
+	struct kunit_case *test_case;
+	size_t len = 0;
+
+	for (test_case = test_cases; test_case->run_case; test_case++)
+		len++;
+
+	return len;
+}
+
+static void kunit_print_subtest_start(struct kunit_suite *suite)
+{
+	kunit_print_tap_version();
+	kunit_printk_emit(LOGLEVEL_INFO, "\t# Subtest: %s\n", suite->name);
+	kunit_printk_emit(LOGLEVEL_INFO,
+			  "\t1..%zd\n",
+			  kunit_test_cases_len(suite->test_cases));
+}
+
+static void kunit_print_ok_not_ok(bool should_indent,
+				  bool is_ok,
+				  size_t test_number,
+				  const char *description)
+{
+	const char *indent, *ok_not_ok;
+
+	if (should_indent)
+		indent = "\t";
+	else
+		indent = "";
+
+	if (is_ok)
+		ok_not_ok = "ok";
+	else
+		ok_not_ok = "not ok";
+
+	kunit_printk_emit(LOGLEVEL_INFO,
+			  "%s%s %zd - %s\n",
+			  indent, ok_not_ok, test_number, description);
+}
+
+static bool kunit_suite_has_succeeded(struct kunit_suite *suite)
+{
+	const struct kunit_case *test_case;
+
+	for (test_case = suite->test_cases; test_case->run_case; test_case++)
+		if (!test_case->success)
+			return false;
+
+	return true;
+}
+
+static void kunit_print_subtest_end(struct kunit_suite *suite)
+{
+	static size_t kunit_suite_counter = 1;
+
+	kunit_print_ok_not_ok(false,
+			      kunit_suite_has_succeeded(suite),
+			      kunit_suite_counter++,
+			      suite->name);
+}
+
+static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
+					    size_t test_number)
+{
+	kunit_print_ok_not_ok(true,
+			      test_case->success,
+			      test_number,
+			      test_case->name);
+}
+
+void kunit_init_test(struct kunit *test, const char *name)
+{
+	test->name = name;
+	test->success = true;
+}
+
+/*
+ * Performs all logic to run a test case.
+ */
+static void kunit_run_case(struct kunit_suite *suite,
+			   struct kunit_case *test_case)
+{
+	struct kunit test;
+
+	kunit_init_test(&test, test_case->name);
+
+	if (suite->init) {
+		int ret;
+
+		ret = suite->init(&test);
+		if (ret) {
+			kunit_err(&test, "failed to initialize: %d\n", ret);
+			kunit_set_failure(&test);
+			test_case->success = test.success;
+			return;
+		}
+	}
+
+	test_case->run_case(&test);
+
+	if (suite->exit)
+		suite->exit(&test);
+
+	test_case->success = test.success;
+}
+
+int kunit_run_tests(struct kunit_suite *suite)
+{
+	struct kunit_case *test_case;
+	size_t test_case_count = 1;
+
+	kunit_print_subtest_start(suite);
+
+	for (test_case = suite->test_cases; test_case->run_case; test_case++) {
+		kunit_run_case(suite, test_case);
+		kunit_print_test_case_ok_not_ok(test_case, test_case_count++);
+	}
+
+	kunit_print_subtest_end(suite);
+
+	return 0;
+}
+
+void kunit_printk(const char *level,
+		  const struct kunit *test,
+		  const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	kunit_vprintk(test, level, &vaf);
+
+	va_end(args);
+}
-- 
2.23.0.rc1.153.gdeed80330f-goog

[PATCH v12 02/18] kunit: test: add test resource management API

[Brendan Higgins]

Create a common API for test managed resources like memory and test
objects. A lot of times a test will want to set up infrastructure to be
used in test cases; this could be anything from just wanting to allocate
some memory to setting up a driver stack; this defines facilities for
creating "test resources" which are managed by the test infrastructure
and are automatically cleaned up at the conclusion of the test.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 include/kunit/test.h | 143 +++++++++++++++++++++++++++++++++++++++++++
 kunit/test.c         |  92 ++++++++++++++++++++++++++++
 2 files changed, 235 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index e0b34acb9ee4e..d0bf112910caf 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -10,6 +10,70 @@
 #define _KUNIT_TEST_H
 
 #include <linux/types.h>
+#include <linux/slab.h>
+
+struct kunit_resource;
+
+typedef int (*kunit_resource_init_t)(struct kunit_resource *, void *);
+typedef void (*kunit_resource_free_t)(struct kunit_resource *);
+
+/**
+ * struct kunit_resource - represents a *test managed resource*
+ * @allocation: for the user to store arbitrary data.
+ * @free: a user supplied function to free the resource. Populated by
+ * kunit_alloc_resource().
+ *
+ * Represents a *test managed resource*, a resource which will automatically be
+ * cleaned up at the end of a test case.
+ *
+ * Example:
+ *
+ * .. code-block:: c
+ *
+ *	struct kunit_kmalloc_params {
+ *		size_t size;
+ *		gfp_t gfp;
+ *	};
+ *
+ *	static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
+ *	{
+ *		struct kunit_kmalloc_params *params = context;
+ *		res->allocation = kmalloc(params->size, params->gfp);
+ *
+ *		if (!res->allocation)
+ *			return -ENOMEM;
+ *
+ *		return 0;
+ *	}
+ *
+ *	static void kunit_kmalloc_free(struct kunit_resource *res)
+ *	{
+ *		kfree(res->allocation);
+ *	}
+ *
+ *	void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
+ *	{
+ *		struct kunit_kmalloc_params params;
+ *		struct kunit_resource *res;
+ *
+ *		params.size = size;
+ *		params.gfp = gfp;
+ *
+ *		res = kunit_alloc_resource(test, kunit_kmalloc_init,
+ *			kunit_kmalloc_free, &params);
+ *		if (res)
+ *			return res->allocation;
+ *
+ *		return NULL;
+ *	}
+ */
+struct kunit_resource {
+	void *allocation;
+	kunit_resource_free_t free;
+
+	/* private: internal use only. */
+	struct list_head node;
+};
 
 struct kunit;
 
@@ -109,6 +173,13 @@ struct kunit {
 	 * have terminated.
 	 */
 	bool success; /* Read only after test_case finishes! */
+	spinlock_t lock; /* Gaurds all mutable test state. */
+	/*
+	 * Because resources is a list that may be updated multiple times (with
+	 * new resources) from any thread associated with a test case, we must
+	 * protect it with some type of lock.
+	 */
+	struct list_head resources; /* Protected by lock. */
 };
 
 void kunit_init_test(struct kunit *test, const char *name);
@@ -141,6 +212,78 @@ int kunit_run_tests(struct kunit_suite *suite);
 		}							       \
 		late_initcall(kunit_suite_init##suite)
 
+/*
+ * Like kunit_alloc_resource() below, but returns the struct kunit_resource
+ * object that contains the allocation. This is mostly for testing purposes.
+ */
+struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
+						    kunit_resource_init_t init,
+						    kunit_resource_free_t free,
+						    gfp_t internal_gfp,
+						    void *context);
+
+/**
+ * kunit_alloc_resource() - Allocates a *test managed resource*.
+ * @test: The test context object.
+ * @init: a user supplied function to initialize the resource.
+ * @free: a user supplied function to free the resource.
+ * @internal_gfp: gfp to use for internal allocations, if unsure, use GFP_KERNEL
+ * @context: for the user to pass in arbitrary data to the init function.
+ *
+ * Allocates a *test managed resource*, a resource which will automatically be
+ * cleaned up at the end of a test case. See &struct kunit_resource for an
+ * example.
+ *
+ * NOTE: KUnit needs to allocate memory for each kunit_resource object. You must
+ * specify an @internal_gfp that is compatible with the use context of your
+ * resource.
+ */
+static inline void *kunit_alloc_resource(struct kunit *test,
+					 kunit_resource_init_t init,
+					 kunit_resource_free_t free,
+					 gfp_t internal_gfp,
+					 void *context)
+{
+	struct kunit_resource *res;
+
+	res = kunit_alloc_and_get_resource(test, init, free, internal_gfp,
+					   context);
+
+	if (res)
+		return res->allocation;
+
+	return NULL;
+}
+
+void kunit_free_resource(struct kunit *test, struct kunit_resource *res);
+
+/**
+ * kunit_kmalloc() - Like kmalloc() except the allocation is *test managed*.
+ * @test: The test context object.
+ * @size: The size in bytes of the desired memory.
+ * @gfp: flags passed to underlying kmalloc().
+ *
+ * Just like `kmalloc(...)`, except the allocation is managed by the test case
+ * and is automatically cleaned up after the test case concludes. See &struct
+ * kunit_resource for more information.
+ */
+void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp);
+
+/**
+ * kunit_kzalloc() - Just like kunit_kmalloc(), but zeroes the allocation.
+ * @test: The test context object.
+ * @size: The size in bytes of the desired memory.
+ * @gfp: flags passed to underlying kmalloc().
+ *
+ * See kzalloc() and kunit_kmalloc() for more information.
+ */
+static inline void *kunit_kzalloc(struct kunit *test, size_t size, gfp_t gfp)
+{
+	return kunit_kmalloc(test, size, gfp | __GFP_ZERO);
+}
+
+void kunit_cleanup(struct kunit *test);
+
 void __printf(3, 4) kunit_printk(const char *level,
 				 const struct kunit *test,
 				 const char *fmt, ...);
diff --git a/kunit/test.c b/kunit/test.c
index d302cff0f1dc7..4c178a817f2fe 100644
--- a/kunit/test.c
+++ b/kunit/test.c
@@ -122,6 +122,8 @@ static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
 
 void kunit_init_test(struct kunit *test, const char *name)
 {
+	spin_lock_init(&test->lock);
+	INIT_LIST_HEAD(&test->resources);
 	test->name = name;
 	test->success = true;
 }
@@ -153,6 +155,8 @@ static void kunit_run_case(struct kunit_suite *suite,
 	if (suite->exit)
 		suite->exit(&test);
 
+	kunit_cleanup(&test);
+
 	test_case->success = test.success;
 }
 
@@ -173,6 +177,94 @@ int kunit_run_tests(struct kunit_suite *suite)
 	return 0;
 }
 
+struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
+						    kunit_resource_init_t init,
+						    kunit_resource_free_t free,
+						    gfp_t internal_gfp,
+						    void *context)
+{
+	struct kunit_resource *res;
+	int ret;
+
+	res = kzalloc(sizeof(*res), internal_gfp);
+	if (!res)
+		return NULL;
+
+	ret = init(res, context);
+	if (ret)
+		return NULL;
+
+	res->free = free;
+	spin_lock(&test->lock);
+	list_add_tail(&res->node, &test->resources);
+	spin_unlock(&test->lock);
+
+	return res;
+}
+
+void kunit_free_resource(struct kunit *test, struct kunit_resource *res)
+{
+	lockdep_assert_held(&test->lock);
+
+	res->free(res);
+	list_del(&res->node);
+	kfree(res);
+}
+
+struct kunit_kmalloc_params {
+	size_t size;
+	gfp_t gfp;
+};
+
+static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
+{
+	struct kunit_kmalloc_params *params = context;
+
+	res->allocation = kmalloc(params->size, params->gfp);
+	if (!res->allocation)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void kunit_kmalloc_free(struct kunit_resource *res)
+{
+	kfree(res->allocation);
+}
+
+void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
+{
+	struct kunit_kmalloc_params params = {
+		.size = size,
+		.gfp = gfp
+	};
+
+	return kunit_alloc_resource(test,
+				    kunit_kmalloc_init,
+				    kunit_kmalloc_free,
+				    gfp,
+				    &params);
+}
+
+void kunit_cleanup(struct kunit *test)
+{
+	struct kunit_resource *resource, *resource_safe;
+
+	spin_lock(&test->lock);
+	/*
+	 * test->resources is a stack - each allocation must be freed in the
+	 * reverse order from which it was added since one resource may depend
+	 * on another for its entire lifetime.
+	 */
+	list_for_each_entry_safe_reverse(resource,
+					 resource_safe,
+					 &test->resources,
+					 node) {
+		kunit_free_resource(test, resource);
+	}
+	spin_unlock(&test->lock);
+}
+
 void kunit_printk(const char *level,
 		  const struct kunit *test,
 		  const char *fmt, ...)
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 02/18] kunit: test: add test resource management API

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:05)
> Create a common API for test managed resources like memory and test
> objects. A lot of times a test will want to set up infrastructure to be
> used in test cases; this could be anything from just wanting to allocate
> some memory to setting up a driver stack; this defines facilities for
> creating "test resources" which are managed by the test infrastructure
> and are automatically cleaned up at the conclusion of the test.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

[PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

A number of test features need to do pretty complicated string printing
where it may not be possible to rely on a single preallocated string
with parameters.

So provide a library for constructing the string as you go similar to
C++'s std::string. string_stream is really just a string builder,
nothing more.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 include/kunit/string-stream.h |  49 +++++++++++
 kunit/Makefile                |   3 +-
 kunit/string-stream.c         | 152 ++++++++++++++++++++++++++++++++++
 3 files changed, 203 insertions(+), 1 deletion(-)
 create mode 100644 include/kunit/string-stream.h
 create mode 100644 kunit/string-stream.c

diff --git a/include/kunit/string-stream.h b/include/kunit/string-stream.h
new file mode 100644
index 0000000000000..4fa107e38deb5
--- /dev/null
+++ b/include/kunit/string-stream.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * C++ stream style string builder used in KUnit for building messages.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#ifndef _KUNIT_STRING_STREAM_H
+#define _KUNIT_STRING_STREAM_H
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <stdarg.h>
+
+struct string_stream_fragment {
+	struct list_head node;
+	char *fragment;
+};
+
+struct string_stream {
+	size_t length;
+	struct list_head fragments;
+	/* length and fragments are protected by this lock */
+	spinlock_t lock;
+	struct kunit *test;
+	gfp_t gfp;
+};
+
+struct kunit;
+
+struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp);
+
+int string_stream_add(struct string_stream *stream, const char *fmt, ...);
+
+int string_stream_vadd(struct string_stream *stream,
+		       const char *fmt,
+		       va_list args);
+
+char *string_stream_get_string(struct string_stream *stream);
+
+int string_stream_append(struct string_stream *stream,
+			 struct string_stream *other);
+
+void string_stream_clear(struct string_stream *stream);
+
+bool string_stream_is_empty(struct string_stream *stream);
+
+#endif /* _KUNIT_STRING_STREAM_H */
diff --git a/kunit/Makefile b/kunit/Makefile
index 5efdc4dea2c08..275b565a0e81f 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1 +1,2 @@
-obj-$(CONFIG_KUNIT) +=			test.o
+obj-$(CONFIG_KUNIT) +=			test.o \
+					string-stream.o
diff --git a/kunit/string-stream.c b/kunit/string-stream.c
new file mode 100644
index 0000000000000..bcd56d6755544
--- /dev/null
+++ b/kunit/string-stream.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * C++ stream style string builder used in KUnit for building messages.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <kunit/string-stream.h>
+#include <kunit/test.h>
+
+int string_stream_vadd(struct string_stream *stream,
+		       const char *fmt,
+		       va_list args)
+{
+	struct string_stream_fragment *frag_container;
+	int len;
+	va_list args_for_counting;
+
+	/* Make a copy because `vsnprintf` could change it */
+	va_copy(args_for_counting, args);
+
+	/* Need space for null byte. */
+	len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
+
+	va_end(args_for_counting);
+
+	frag_container = kunit_kmalloc(stream->test, sizeof(*frag_container),
+				       stream->gfp);
+	if (!frag_container)
+		return -ENOMEM;
+
+	frag_container->fragment = kunit_kmalloc(stream->test, len,
+						 stream->gfp);
+	if (!frag_container->fragment)
+		return -ENOMEM;
+
+	len = vsnprintf(frag_container->fragment, len, fmt, args);
+	spin_lock(&stream->lock);
+	stream->length += len;
+	list_add_tail(&frag_container->node, &stream->fragments);
+	spin_unlock(&stream->lock);
+
+	return 0;
+}
+
+int string_stream_add(struct string_stream *stream, const char *fmt, ...)
+{
+	va_list args;
+	int result;
+
+	va_start(args, fmt);
+	result = string_stream_vadd(stream, fmt, args);
+	va_end(args);
+
+	return result;
+}
+
+void string_stream_clear(struct string_stream *stream)
+{
+	struct string_stream_fragment *frag_container, *frag_container_safe;
+
+	spin_lock(&stream->lock);
+	list_for_each_entry_safe(frag_container,
+				 frag_container_safe,
+				 &stream->fragments,
+				 node) {
+		list_del(&frag_container->node);
+	}
+	stream->length = 0;
+	spin_unlock(&stream->lock);
+}
+
+char *string_stream_get_string(struct string_stream *stream)
+{
+	struct string_stream_fragment *frag_container;
+	size_t buf_len = stream->length + 1; /* +1 for null byte. */
+	char *buf;
+
+	buf = kunit_kzalloc(stream->test, buf_len, stream->gfp);
+	if (!buf)
+		return NULL;
+
+	spin_lock(&stream->lock);
+	list_for_each_entry(frag_container, &stream->fragments, node)
+		strlcat(buf, frag_container->fragment, buf_len);
+	spin_unlock(&stream->lock);
+
+	return buf;
+}
+
+int string_stream_append(struct string_stream *stream,
+			 struct string_stream *other)
+{
+	const char *other_content;
+
+	other_content = string_stream_get_string(other);
+
+	if (!other_content)
+		return -ENOMEM;
+
+	return string_stream_add(stream, other_content);
+}
+
+bool string_stream_is_empty(struct string_stream *stream)
+{
+	return list_empty(&stream->fragments);
+}
+
+struct string_stream_alloc_context {
+	struct kunit *test;
+	gfp_t gfp;
+};
+
+static int string_stream_init(struct kunit_resource *res, void *context)
+{
+	struct string_stream *stream;
+	struct string_stream_alloc_context *ctx = context;
+
+	stream = kunit_kzalloc(ctx->test, sizeof(*stream), ctx->gfp);
+	if (!stream)
+		return -ENOMEM;
+
+	res->allocation = stream;
+	stream->gfp = ctx->gfp;
+	stream->test = ctx->test;
+	INIT_LIST_HEAD(&stream->fragments);
+	spin_lock_init(&stream->lock);
+
+	return 0;
+}
+
+static void string_stream_free(struct kunit_resource *res)
+{
+	/* Nothing to do since everything is already a KUnit managed resource */
+}
+
+struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp)
+{
+	struct string_stream_alloc_context context = {
+		.test = test,
+		.gfp = gfp
+	};
+
+	return kunit_alloc_resource(test,
+				    string_stream_init,
+				    string_stream_free,
+				    gfp,
+				    &context);
+}
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:06)
> +void string_stream_clear(struct string_stream *stream)
> +{
> +       struct string_stream_fragment *frag_container, *frag_container_safe;
> +
> +       spin_lock(&stream->lock);
> +       list_for_each_entry_safe(frag_container,
> +                                frag_container_safe,
> +                                &stream->fragments,
> +                                node) {
> +               list_del(&frag_container->node);

Shouldn't we free the allocation here? Otherwise, if some test is going
to add, add, clear, add, it's going to leak until the test is over?

> +       }
> +       stream->length = 0;
> +       spin_unlock(&stream->lock);
> +}
> +

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

On Mon, Aug 12, 2019 at 03:55:19PM -0700, Stephen Boyd wrote:
> Quoting Brendan Higgins (2019-08-12 11:24:06)
> > +void string_stream_clear(struct string_stream *stream)
> > +{
> > +       struct string_stream_fragment *frag_container, *frag_container_safe;
> > +
> > +       spin_lock(&stream->lock);
> > +       list_for_each_entry_safe(frag_container,
> > +                                frag_container_safe,
> > +                                &stream->fragments,
> > +                                node) {
> > +               list_del(&frag_container->node);
> 
> Shouldn't we free the allocation here? Otherwise, if some test is going
> to add, add, clear, add, it's going to leak until the test is over?

So basically this means I should add a kunit_kfree and
kunit_resource_destroy (respective equivalents to devm_kfree, and
devres_destroy) and use kunit_kfree here?

> > +       }
> > +       stream->length = 0;
> > +       spin_unlock(&stream->lock);
> > +}
> > +

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 16:33:36)
> On Mon, Aug 12, 2019 at 03:55:19PM -0700, Stephen Boyd wrote:
> > Quoting Brendan Higgins (2019-08-12 11:24:06)
> > > +void string_stream_clear(struct string_stream *stream)
> > > +{
> > > +       struct string_stream_fragment *frag_container, *frag_container_safe;
> > > +
> > > +       spin_lock(&stream->lock);
> > > +       list_for_each_entry_safe(frag_container,
> > > +                                frag_container_safe,
> > > +                                &stream->fragments,
> > > +                                node) {
> > > +               list_del(&frag_container->node);
> > 
> > Shouldn't we free the allocation here? Otherwise, if some test is going
> > to add, add, clear, add, it's going to leak until the test is over?
> 
> So basically this means I should add a kunit_kfree and
> kunit_resource_destroy (respective equivalents to devm_kfree, and
> devres_destroy) and use kunit_kfree here?
> 

Yes, or drop the API entirely? Does anything need this functionality?

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 16:33:36)
> > On Mon, Aug 12, 2019 at 03:55:19PM -0700, Stephen Boyd wrote:
> > > Quoting Brendan Higgins (2019-08-12 11:24:06)
> > > > +void string_stream_clear(struct string_stream *stream)
> > > > +{
> > > > +       struct string_stream_fragment *frag_container, *frag_container_safe;
> > > > +
> > > > +       spin_lock(&stream->lock);
> > > > +       list_for_each_entry_safe(frag_container,
> > > > +                                frag_container_safe,
> > > > +                                &stream->fragments,
> > > > +                                node) {
> > > > +               list_del(&frag_container->node);
> > >
> > > Shouldn't we free the allocation here? Otherwise, if some test is going
> > > to add, add, clear, add, it's going to leak until the test is over?
> >
> > So basically this means I should add a kunit_kfree and
> > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > devres_destroy) and use kunit_kfree here?
> >
>
> Yes, or drop the API entirely? Does anything need this functionality?

Drop the kunit_resource API? I would strongly prefer not to.
string_stream uses it; the expectation stuff uses it via string
stream; some of the tests in this patchset allocate memory as part of
the test setup that uses it. The intention is that we would provide a
kunit_res_* version of many (hopefully eventually most) common
resources required by tests and it would be used in the same way that
the devm_* stuff is.

Nevertheless, I am fine adding the kunit_resource_destroy, etc. I just
wanted to make sure I understood what you were asking.

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 17:41:05)
> On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > > devres_destroy) and use kunit_kfree here?
> > >
> >
> > Yes, or drop the API entirely? Does anything need this functionality?
> 
> Drop the kunit_resource API? I would strongly prefer not to.

No. I mean this API, string_stream_clear(). Does anything use it?

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 17:41:05)
> > On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > > > devres_destroy) and use kunit_kfree here?
> > > >
> > >
> > > Yes, or drop the API entirely? Does anything need this functionality?
> >
> > Drop the kunit_resource API? I would strongly prefer not to.
>
> No. I mean this API, string_stream_clear(). Does anything use it?

Oh, right. No.

However, now that I added the kunit_resource_destroy, I thought it
might be good to free the string_stream after I use it in each call to
kunit_assert->format(...) in which case I will be using this logic.

So I think the right thing to do is to expose string_stream_destroy so
kunit_do_assert can clean up when it's done, and then demote
string_stream_clear to static. Sound good?

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 22:02:59)
> On Mon, Aug 12, 2019 at 9:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 17:41:05)
> > > On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > >
> > > > > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > > > > devres_destroy) and use kunit_kfree here?
> > > > >
> > > >
> > > > Yes, or drop the API entirely? Does anything need this functionality?
> > >
> > > Drop the kunit_resource API? I would strongly prefer not to.
> >
> > No. I mean this API, string_stream_clear(). Does anything use it?
> 
> Oh, right. No.
> 
> However, now that I added the kunit_resource_destroy, I thought it
> might be good to free the string_stream after I use it in each call to
> kunit_assert->format(...) in which case I will be using this logic.
> 
> So I think the right thing to do is to expose string_stream_destroy so
> kunit_do_assert can clean up when it's done, and then demote
> string_stream_clear to static. Sound good?

Ok, sure. I don't really see how clearing it explicitly when the
assertion prints vs. never allocating it to begin with is really any
different. Maybe I've missed something though.

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

On Mon, Aug 12, 2019 at 10:30 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 22:02:59)
> > On Mon, Aug 12, 2019 at 9:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Brendan Higgins (2019-08-12 17:41:05)
> > > > On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > > >
> > > > > > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > > > > > devres_destroy) and use kunit_kfree here?
> > > > > >
> > > > >
> > > > > Yes, or drop the API entirely? Does anything need this functionality?
> > > >
> > > > Drop the kunit_resource API? I would strongly prefer not to.
> > >
> > > No. I mean this API, string_stream_clear(). Does anything use it?
> >
> > Oh, right. No.
> >
> > However, now that I added the kunit_resource_destroy, I thought it
> > might be good to free the string_stream after I use it in each call to
> > kunit_assert->format(...) in which case I will be using this logic.
> >
> > So I think the right thing to do is to expose string_stream_destroy so
> > kunit_do_assert can clean up when it's done, and then demote
> > string_stream_clear to static. Sound good?
>
> Ok, sure. I don't really see how clearing it explicitly when the
> assertion prints vs. never allocating it to begin with is really any
> different. Maybe I've missed something though.

It's for the case that we *do* print something out. Once we are doing
printing, we don't want the fragments anymore.

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Brendan Higgins]

On Tue, Aug 13, 2019 at 2:04 AM Brendan Higgins
<brendanhiggins@google.com> wrote:
>
> On Mon, Aug 12, 2019 at 10:30 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 22:02:59)
> > > On Mon, Aug 12, 2019 at 9:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > >
> > > > Quoting Brendan Higgins (2019-08-12 17:41:05)
> > > > > On Mon, Aug 12, 2019 at 4:59 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > > > >
> > > > > > > kunit_resource_destroy (respective equivalents to devm_kfree, and
> > > > > > > devres_destroy) and use kunit_kfree here?
> > > > > > >
> > > > > >
> > > > > > Yes, or drop the API entirely? Does anything need this functionality?
> > > > >
> > > > > Drop the kunit_resource API? I would strongly prefer not to.
> > > >
> > > > No. I mean this API, string_stream_clear(). Does anything use it?
> > >
> > > Oh, right. No.
> > >
> > > However, now that I added the kunit_resource_destroy, I thought it
> > > might be good to free the string_stream after I use it in each call to
> > > kunit_assert->format(...) in which case I will be using this logic.
> > >
> > > So I think the right thing to do is to expose string_stream_destroy so
> > > kunit_do_assert can clean up when it's done, and then demote
> > > string_stream_clear to static. Sound good?
> >
> > Ok, sure. I don't really see how clearing it explicitly when the
> > assertion prints vs. never allocating it to begin with is really any
> > different. Maybe I've missed something though.
>
> It's for the case that we *do* print something out. Once we are doing
> printing, we don't want the fragments anymore.

Oops, sorry fat fingered: s/doing/done

Re: [PATCH v12 03/18] kunit: test: add string_stream a std::stream like string builder

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-13 02:12:54)
> On Tue, Aug 13, 2019 at 2:04 AM Brendan Higgins
> <brendanhiggins@google.com> wrote:
> >
> > On Mon, Aug 12, 2019 at 10:30 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Brendan Higgins (2019-08-12 22:02:59)
> > > > However, now that I added the kunit_resource_destroy, I thought it
> > > > might be good to free the string_stream after I use it in each call to
> > > > kunit_assert->format(...) in which case I will be using this logic.
> > > >
> > > > So I think the right thing to do is to expose string_stream_destroy so
> > > > kunit_do_assert can clean up when it's done, and then demote
> > > > string_stream_clear to static. Sound good?
> > >
> > > Ok, sure. I don't really see how clearing it explicitly when the
> > > assertion prints vs. never allocating it to begin with is really any
> > > different. Maybe I've missed something though.
> >
> > It's for the case that we *do* print something out. Once we are doing
> > printing, we don't want the fragments anymore.
> 
> Oops, sorry fat fingered: s/doing/done

Yes, but when we print something out we've run into some sort of problem
and then the test is over. So freeing the memory when it fails vs. when
the test is over seems like a minor difference. Or is it also used to
print other informational messages while the test is running?

I'm not particularly worried here, just trying to see if less code is
possible.

[PATCH v12 04/18] kunit: test: add assertion printing library

[Brendan Higgins]

Add `struct kunit_assert` and friends which provide a structured way to
capture data from an expectation or an assertion (introduced later in
the series) so that it may be printed out in the event of a failure.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
---
 include/kunit/assert.h | 183 +++++++++++++++++++++++++++++++++++++++++
 kunit/Makefile         |   3 +-
 kunit/assert.c         | 141 +++++++++++++++++++++++++++++++
 3 files changed, 326 insertions(+), 1 deletion(-)
 create mode 100644 include/kunit/assert.h
 create mode 100644 kunit/assert.c

diff --git a/include/kunit/assert.h b/include/kunit/assert.h
new file mode 100644
index 0000000000000..55f1b88b0cb4d
--- /dev/null
+++ b/include/kunit/assert.h
@@ -0,0 +1,183 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Assertion and expectation serialization API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#ifndef _KUNIT_ASSERT_H
+#define _KUNIT_ASSERT_H
+
+#include <linux/err.h>
+#include <kunit/string-stream.h>
+
+struct kunit;
+
+enum kunit_assert_type {
+	KUNIT_ASSERTION,
+	KUNIT_EXPECTATION,
+};
+
+struct kunit_assert {
+	struct kunit *test;
+	enum kunit_assert_type type;
+	int line;
+	const char *file;
+	struct va_format message;
+	void (*format)(const struct kunit_assert *assert,
+		       struct string_stream *stream);
+};
+
+#define KUNIT_INIT_VA_FMT_NULL { .fmt = NULL, .va = NULL }
+
+#define KUNIT_INIT_ASSERT_STRUCT(kunit, assert_type, fmt) {		       \
+	.test = kunit,							       \
+	.type = assert_type,						       \
+	.file = __FILE__,						       \
+	.line = __LINE__,						       \
+	.message = KUNIT_INIT_VA_FMT_NULL,				       \
+	.format = fmt							       \
+}
+
+void kunit_base_assert_format(const struct kunit_assert *assert,
+			      struct string_stream *stream);
+
+void kunit_assert_print_msg(const struct kunit_assert *assert,
+			    struct string_stream *stream);
+
+struct kunit_fail_assert {
+	struct kunit_assert assert;
+};
+
+void kunit_fail_assert_format(const struct kunit_assert *assert,
+			      struct string_stream *stream);
+
+#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {			       \
+		.assert = KUNIT_INIT_ASSERT_STRUCT(test,		       \
+						   type,		       \
+						   kunit_fail_assert_format)   \
+}
+
+struct kunit_unary_assert {
+	struct kunit_assert assert;
+	const char *condition;
+	bool expected_true;
+};
+
+void kunit_unary_assert_format(const struct kunit_assert *assert,
+			       struct string_stream *stream);
+
+#define KUNIT_INIT_UNARY_ASSERT_STRUCT(test, type, cond, expect_true) {	       \
+	.assert = KUNIT_INIT_ASSERT_STRUCT(test,			       \
+					   type,			       \
+					   kunit_unary_assert_format),	       \
+	.condition = cond,						       \
+	.expected_true = expect_true					       \
+}
+
+struct kunit_ptr_not_err_assert {
+	struct kunit_assert assert;
+	const char *text;
+	const void *value;
+};
+
+void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert,
+				     struct string_stream *stream);
+
+#define KUNIT_INIT_PTR_NOT_ERR_STRUCT(test, type, txt, val) {		       \
+	.assert = KUNIT_INIT_ASSERT_STRUCT(test,			       \
+					   type,			       \
+					   kunit_ptr_not_err_assert_format),   \
+	.text = txt,							       \
+	.value = val							       \
+}
+
+struct kunit_binary_assert {
+	struct kunit_assert assert;
+	const char *operation;
+	const char *left_text;
+	long long left_value;
+	const char *right_text;
+	long long right_value;
+};
+
+void kunit_binary_assert_format(const struct kunit_assert *assert,
+				struct string_stream *stream);
+
+#define KUNIT_INIT_BINARY_ASSERT_STRUCT(test,				       \
+					type,				       \
+					op_str,				       \
+					left_str,			       \
+					left_val,			       \
+					right_str,			       \
+					right_val) {			       \
+	.assert = KUNIT_INIT_ASSERT_STRUCT(test,			       \
+					   type,			       \
+					   kunit_binary_assert_format),	       \
+	.operation = op_str,						       \
+	.left_text = left_str,						       \
+	.left_value = left_val,						       \
+	.right_text = right_str,					       \
+	.right_value = right_val					       \
+}
+
+struct kunit_binary_ptr_assert {
+	struct kunit_assert assert;
+	const char *operation;
+	const char *left_text;
+	const void *left_value;
+	const char *right_text;
+	const void *right_value;
+};
+
+void kunit_binary_ptr_assert_format(const struct kunit_assert *assert,
+				    struct string_stream *stream);
+
+#define KUNIT_INIT_BINARY_PTR_ASSERT_STRUCT(test,			       \
+					    type,			       \
+					    op_str,			       \
+					    left_str,			       \
+					    left_val,			       \
+					    right_str,			       \
+					    right_val) {		       \
+	.assert = KUNIT_INIT_ASSERT_STRUCT(test,			       \
+					   type,			       \
+					   kunit_binary_ptr_assert_format),    \
+	.operation = op_str,						       \
+	.left_text = left_str,						       \
+	.left_value = left_val,						       \
+	.right_text = right_str,					       \
+	.right_value = right_val					       \
+}
+
+struct kunit_binary_str_assert {
+	struct kunit_assert assert;
+	const char *operation;
+	const char *left_text;
+	const char *left_value;
+	const char *right_text;
+	const char *right_value;
+};
+
+void kunit_binary_str_assert_format(const struct kunit_assert *assert,
+				    struct string_stream *stream);
+
+#define KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(test,			       \
+					    type,			       \
+					    op_str,			       \
+					    left_str,			       \
+					    left_val,			       \
+					    right_str,			       \
+					    right_val) {		       \
+	.assert = KUNIT_INIT_ASSERT_STRUCT(test,			       \
+					   type,			       \
+					   kunit_binary_str_assert_format),    \
+	.operation = op_str,						       \
+	.left_text = left_str,						       \
+	.left_value = left_val,						       \
+	.right_text = right_str,					       \
+	.right_value = right_val					       \
+}
+
+#endif /*  _KUNIT_ASSERT_H */
diff --git a/kunit/Makefile b/kunit/Makefile
index 275b565a0e81f..6dcbe309036b8 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_KUNIT) +=			test.o \
-					string-stream.o
+					string-stream.o \
+					assert.o
diff --git a/kunit/assert.c b/kunit/assert.c
new file mode 100644
index 0000000000000..86013d4cf891c
--- /dev/null
+++ b/kunit/assert.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Assertion and expectation serialization API.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+#include <kunit/assert.h>
+
+void kunit_base_assert_format(const struct kunit_assert *assert,
+			      struct string_stream *stream)
+{
+	const char *expect_or_assert = NULL;
+
+	switch (assert->type) {
+	case KUNIT_EXPECTATION:
+		expect_or_assert = "EXPECTATION";
+		break;
+	case KUNIT_ASSERTION:
+		expect_or_assert = "ASSERTION";
+		break;
+	}
+
+	string_stream_add(stream, "%s FAILED at %s:%d\n",
+			 expect_or_assert, assert->file, assert->line);
+}
+
+void kunit_assert_print_msg(const struct kunit_assert *assert,
+			    struct string_stream *stream)
+{
+	if (assert->message.fmt)
+		string_stream_add(stream, "\n%pV", &assert->message);
+}
+
+void kunit_fail_assert_format(const struct kunit_assert *assert,
+			      struct string_stream *stream)
+{
+	kunit_base_assert_format(assert, stream);
+	string_stream_add(stream, "%pV", &assert->message);
+}
+
+void kunit_unary_assert_format(const struct kunit_assert *assert,
+			       struct string_stream *stream)
+{
+	struct kunit_unary_assert *unary_assert = container_of(
+			assert, struct kunit_unary_assert, assert);
+
+	kunit_base_assert_format(assert, stream);
+	if (unary_assert->expected_true)
+		string_stream_add(stream,
+				 "\tExpected %s to be true, but is false\n",
+				 unary_assert->condition);
+	else
+		string_stream_add(stream,
+				 "\tExpected %s to be false, but is true\n",
+				 unary_assert->condition);
+	kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert,
+				     struct string_stream *stream)
+{
+	struct kunit_ptr_not_err_assert *ptr_assert = container_of(
+			assert, struct kunit_ptr_not_err_assert, assert);
+
+	kunit_base_assert_format(assert, stream);
+	if (!ptr_assert->value) {
+		string_stream_add(stream,
+				 "\tExpected %s is not null, but is\n",
+				 ptr_assert->text);
+	} else if (IS_ERR(ptr_assert->value)) {
+		string_stream_add(stream,
+				 "\tExpected %s is not error, but is: %ld\n",
+				 ptr_assert->text,
+				 PTR_ERR(ptr_assert->value));
+	}
+	kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_assert_format(const struct kunit_assert *assert,
+				struct string_stream *stream)
+{
+	struct kunit_binary_assert *binary_assert = container_of(
+			assert, struct kunit_binary_assert, assert);
+
+	kunit_base_assert_format(assert, stream);
+	string_stream_add(stream,
+			 "\tExpected %s %s %s, but\n",
+			 binary_assert->left_text,
+			 binary_assert->operation,
+			 binary_assert->right_text);
+	string_stream_add(stream, "\t\t%s == %lld\n",
+			 binary_assert->left_text,
+			 binary_assert->left_value);
+	string_stream_add(stream, "\t\t%s == %lld",
+			 binary_assert->right_text,
+			 binary_assert->right_value);
+	kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_ptr_assert_format(const struct kunit_assert *assert,
+				    struct string_stream *stream)
+{
+	struct kunit_binary_ptr_assert *binary_assert = container_of(
+			assert, struct kunit_binary_ptr_assert, assert);
+
+	kunit_base_assert_format(assert, stream);
+	string_stream_add(stream,
+			 "\tExpected %s %s %s, but\n",
+			 binary_assert->left_text,
+			 binary_assert->operation,
+			 binary_assert->right_text);
+	string_stream_add(stream, "\t\t%s == %pK\n",
+			 binary_assert->left_text,
+			 binary_assert->left_value);
+	string_stream_add(stream, "\t\t%s == %pK",
+			 binary_assert->right_text,
+			 binary_assert->right_value);
+	kunit_assert_print_msg(assert, stream);
+}
+
+void kunit_binary_str_assert_format(const struct kunit_assert *assert,
+				    struct string_stream *stream)
+{
+	struct kunit_binary_str_assert *binary_assert = container_of(
+			assert, struct kunit_binary_str_assert, assert);
+
+	kunit_base_assert_format(assert, stream);
+	string_stream_add(stream,
+			 "\tExpected %s %s %s, but\n",
+			 binary_assert->left_text,
+			 binary_assert->operation,
+			 binary_assert->right_text);
+	string_stream_add(stream, "\t\t%s == %s\n",
+			 binary_assert->left_text,
+			 binary_assert->left_value);
+	string_stream_add(stream, "\t\t%s == %s",
+			 binary_assert->right_text,
+			 binary_assert->right_value);
+	kunit_assert_print_msg(assert, stream);
+}
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 04/18] kunit: test: add assertion printing library

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:07)
> Add `struct kunit_assert` and friends which provide a structured way to
> capture data from an expectation or an assertion (introduced later in
> the series) so that it may be printed out in the event of a failure.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

Just some minor nits below

> diff --git a/include/kunit/assert.h b/include/kunit/assert.h
> new file mode 100644
> index 0000000000000..55f1b88b0cb4d
> --- /dev/null
> +++ b/include/kunit/assert.h
> @@ -0,0 +1,183 @@
[...]
> +                           struct string_stream *stream);
> +
> +struct kunit_fail_assert {
> +       struct kunit_assert assert;
> +};
> +
> +void kunit_fail_assert_format(const struct kunit_assert *assert,
> +                             struct string_stream *stream);
> +
> +#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {                           \
> +               .assert = KUNIT_INIT_ASSERT_STRUCT(test,                       \
> +                                                  type,                       \
> +                                                  kunit_fail_assert_format)   \

This one got indented one too many times?

> +}
> +
> +struct kunit_unary_assert {
> +       struct kunit_assert assert;
> +       const char *condition;
> +       bool expected_true;
> +};
> +
> +void kunit_unary_assert_format(const struct kunit_assert *assert,
> +                              struct string_stream *stream);
> +
[...]
> +#define KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(test,                             \
> +                                           type,                              \
> +                                           op_str,                            \
> +                                           left_str,                          \
> +                                           left_val,                          \
> +                                           right_str,                         \
> +                                           right_val) {                       \
> +       .assert = KUNIT_INIT_ASSERT_STRUCT(test,                               \
> +                                          type,                               \
> +                                          kunit_binary_str_assert_format),    \
> +       .operation = op_str,                                                   \
> +       .left_text = left_str,                                                 \
> +       .left_value = left_val,                                                \
> +       .right_text = right_str,                                               \
> +       .right_value = right_val                                               \
> +}

It would be nice to have kernel doc on these macros so we know how to
use them.

Re: [PATCH v12 04/18] kunit: test: add assertion printing library

[Brendan Higgins]

On Mon, Aug 12, 2019 at 4:46 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:07)
> > Add `struct kunit_assert` and friends which provide a structured way to
> > capture data from an expectation or an assertion (introduced later in
> > the series) so that it may be printed out in the event of a failure.
> >
> > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > ---
>
> Reviewed-by: Stephen Boyd <sboyd@kernel.org>
>
> Just some minor nits below
>
> > diff --git a/include/kunit/assert.h b/include/kunit/assert.h
> > new file mode 100644
> > index 0000000000000..55f1b88b0cb4d
> > --- /dev/null
> > +++ b/include/kunit/assert.h
> > @@ -0,0 +1,183 @@
> [...]
> > +                           struct string_stream *stream);
> > +
> > +struct kunit_fail_assert {
> > +       struct kunit_assert assert;
> > +};
> > +
> > +void kunit_fail_assert_format(const struct kunit_assert *assert,
> > +                             struct string_stream *stream);
> > +
> > +#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {                           \
> > +               .assert = KUNIT_INIT_ASSERT_STRUCT(test,                       \
> > +                                                  type,                       \
> > +                                                  kunit_fail_assert_format)   \
>
> This one got indented one too many times?

Not unless I have been using the wrong formatting for multiline
macros. You can see this commit applied here:
https://kunit.googlesource.com/linux/+/870964da2990920030990dd1ffb647ef408e52df/include/kunit/assert.h#59

I have test, type, and kunit_fail_assert_format all column aligned (it
just doesn't render nicely in the patch format).

> > +}
> > +
> > +struct kunit_unary_assert {
> > +       struct kunit_assert assert;
> > +       const char *condition;
> > +       bool expected_true;
> > +};
> > +
> > +void kunit_unary_assert_format(const struct kunit_assert *assert,
> > +                              struct string_stream *stream);
> > +
> [...]
> > +#define KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(test,                             \
> > +                                           type,                              \
> > +                                           op_str,                            \
> > +                                           left_str,                          \
> > +                                           left_val,                          \
> > +                                           right_str,                         \
> > +                                           right_val) {                       \
> > +       .assert = KUNIT_INIT_ASSERT_STRUCT(test,                               \
> > +                                          type,                               \
> > +                                          kunit_binary_str_assert_format),    \
> > +       .operation = op_str,                                                   \
> > +       .left_text = left_str,                                                 \
> > +       .left_value = left_val,                                                \
> > +       .right_text = right_str,                                               \
> > +       .right_value = right_val                                               \
> > +}
>
> It would be nice to have kernel doc on these macros so we know how to
> use them.

Sounds good. Will fix.

Re: [PATCH v12 04/18] kunit: test: add assertion printing library

[Brendan Higgins]

On Mon, Aug 12, 2019 at 4:56 PM Brendan Higgins
<brendanhiggins@google.com> wrote:
>
> On Mon, Aug 12, 2019 at 4:46 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 11:24:07)
> > > Add `struct kunit_assert` and friends which provide a structured way to
> > > capture data from an expectation or an assertion (introduced later in
> > > the series) so that it may be printed out in the event of a failure.
> > >
> > > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > > ---
> >
> > Reviewed-by: Stephen Boyd <sboyd@kernel.org>
> >
> > Just some minor nits below
> >
> > > diff --git a/include/kunit/assert.h b/include/kunit/assert.h
> > > new file mode 100644
> > > index 0000000000000..55f1b88b0cb4d
> > > --- /dev/null
> > > +++ b/include/kunit/assert.h
> > > @@ -0,0 +1,183 @@
> > [...]
> > > +                           struct string_stream *stream);
> > > +
> > > +struct kunit_fail_assert {
> > > +       struct kunit_assert assert;
> > > +};
> > > +
> > > +void kunit_fail_assert_format(const struct kunit_assert *assert,
> > > +                             struct string_stream *stream);
> > > +
> > > +#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {                           \
> > > +               .assert = KUNIT_INIT_ASSERT_STRUCT(test,                       \
> > > +                                                  type,                       \
> > > +                                                  kunit_fail_assert_format)   \
> >
> > This one got indented one too many times?
>
> Not unless I have been using the wrong formatting for multiline
> macros. You can see this commit applied here:
> https://kunit.googlesource.com/linux/+/870964da2990920030990dd1ffb647ef408e52df/include/kunit/assert.h#59
>
> I have test, type, and kunit_fail_assert_format all column aligned (it
> just doesn't render nicely in the patch format).

Disregard that last comment. I just looked at the line immediately
above your comment and thought it looked correct. Sorry about that
(you were pointing out that the .assert line looked wrong, correct?).

> > > +}
> > > +
> > > +struct kunit_unary_assert {
> > > +       struct kunit_assert assert;
> > > +       const char *condition;
> > > +       bool expected_true;
> > > +};
> > > +
> > > +void kunit_unary_assert_format(const struct kunit_assert *assert,
> > > +                              struct string_stream *stream);
> > > +
> > [...]
> > > +#define KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(test,                             \
> > > +                                           type,                              \
> > > +                                           op_str,                            \
> > > +                                           left_str,                          \
> > > +                                           left_val,                          \
> > > +                                           right_str,                         \
> > > +                                           right_val) {                       \
> > > +       .assert = KUNIT_INIT_ASSERT_STRUCT(test,                               \
> > > +                                          type,                               \
> > > +                                          kunit_binary_str_assert_format),    \
> > > +       .operation = op_str,                                                   \
> > > +       .left_text = left_str,                                                 \
> > > +       .left_value = left_val,                                                \
> > > +       .right_text = right_str,                                               \
> > > +       .right_value = right_val                                               \
> > > +}
> >
> > It would be nice to have kernel doc on these macros so we know how to
> > use them.
>
> Sounds good. Will fix.

Re: [PATCH v12 04/18] kunit: test: add assertion printing library

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 21:27:05)
> On Mon, Aug 12, 2019 at 4:56 PM Brendan Higgins
> <brendanhiggins@google.com> wrote:
> >
> > On Mon, Aug 12, 2019 at 4:46 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Brendan Higgins (2019-08-12 11:24:07)
> > > > +#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {                           \
> > > > +               .assert = KUNIT_INIT_ASSERT_STRUCT(test,                       \
> > > > +                                                  type,                       \
> > > > +                                                  kunit_fail_assert_format)   \
> > >
> > > This one got indented one too many times?
> >
> > Not unless I have been using the wrong formatting for multiline
> > macros. You can see this commit applied here:
> > https://kunit.googlesource.com/linux/+/870964da2990920030990dd1ffb647ef408e52df/include/kunit/assert.h#59
> >
> > I have test, type, and kunit_fail_assert_format all column aligned (it
> > just doesn't render nicely in the patch format).
> 
> Disregard that last comment. I just looked at the line immediately
> above your comment and thought it looked correct. Sorry about that
> (you were pointing out that the .assert line looked wrong, correct?).

Yes. .assert is double tabbed?

Re: [PATCH v12 04/18] kunit: test: add assertion printing library

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:57 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 21:27:05)
> > On Mon, Aug 12, 2019 at 4:56 PM Brendan Higgins
> > <brendanhiggins@google.com> wrote:
> > >
> > > On Mon, Aug 12, 2019 at 4:46 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > >
> > > > Quoting Brendan Higgins (2019-08-12 11:24:07)
> > > > > +#define KUNIT_INIT_FAIL_ASSERT_STRUCT(test, type) {                           \
> > > > > +               .assert = KUNIT_INIT_ASSERT_STRUCT(test,                       \
> > > > > +                                                  type,                       \
> > > > > +                                                  kunit_fail_assert_format)   \
> > > >
> > > > This one got indented one too many times?
> > >
> > > Not unless I have been using the wrong formatting for multiline
> > > macros. You can see this commit applied here:
> > > https://kunit.googlesource.com/linux/+/870964da2990920030990dd1ffb647ef408e52df/include/kunit/assert.h#59
> > >
> > > I have test, type, and kunit_fail_assert_format all column aligned (it
> > > just doesn't render nicely in the patch format).
> >
> > Disregard that last comment. I just looked at the line immediately
> > above your comment and thought it looked correct. Sorry about that
> > (you were pointing out that the .assert line looked wrong, correct?).
>
> Yes. .assert is double tabbed?

Yes it is. Sorry about the confusion. Will fix.

[PATCH v12 05/18] kunit: test: add the concept of expectations

[Brendan Higgins]

Add support for expectations, which allow properties to be specified and
then verified in tests.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 include/kunit/test.h | 843 +++++++++++++++++++++++++++++++++++++++++++
 kunit/test.c         |  58 +++
 2 files changed, 901 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index d0bf112910caf..2625bcfeb19ac 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -9,8 +9,10 @@
 #ifndef _KUNIT_TEST_H
 #define _KUNIT_TEST_H
 
+#include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/slab.h>
+#include <kunit/assert.h>
 
 struct kunit_resource;
 
@@ -319,4 +321,845 @@ void __printf(3, 4) kunit_printk(const char *level,
 #define kunit_err(test, fmt, ...) \
 		kunit_printk(KERN_ERR, test, fmt, ##__VA_ARGS__)
 
+/*
+ * Generates a compile-time warning in case of comparing incompatible types.
+ */
+#define __kunit_typecheck(lhs, rhs) \
+	((void) __typecheck(lhs, rhs))
+
+/**
+ * KUNIT_SUCCEED() - A no-op expectation. Only exists for code clarity.
+ * @test: The test context object.
+ *
+ * The opposite of KUNIT_FAIL(), it is an expectation that cannot fail. In other
+ * words, it does nothing and only exists for code clarity. See
+ * KUNIT_EXPECT_TRUE() for more information.
+ */
+#define KUNIT_SUCCEED(test) do {} while (0)
+
+void kunit_do_assertion(struct kunit *test,
+			struct kunit_assert *assert,
+			bool pass,
+			const char *fmt, ...);
+
+#define KUNIT_ASSERTION(test, pass, assert_class, INITIALIZER, fmt, ...) do {  \
+	struct assert_class __assertion = INITIALIZER;			       \
+	kunit_do_assertion(test,					       \
+			   &__assertion.assert,				       \
+			   pass,					       \
+			   fmt,						       \
+			   ##__VA_ARGS__);				       \
+} while (0)
+
+
+#define KUNIT_FAIL_ASSERTION(test, assert_type, fmt, ...)		       \
+		KUNIT_ASSERTION(test,					       \
+				false,					       \
+				kunit_fail_assert,			       \
+				KUNIT_INIT_FAIL_ASSERT_STRUCT(test,	       \
+							      assert_type),    \
+				fmt,					       \
+				##__VA_ARGS__)
+
+/**
+ * KUNIT_FAIL() - Always causes a test to fail when evaluated.
+ * @test: The test context object.
+ * @fmt: an informational message to be printed when the assertion is made.
+ * @...: string format arguments.
+ *
+ * The opposite of KUNIT_SUCCEED(), it is an expectation that always fails. In
+ * other words, it always results in a failed expectation, and consequently
+ * always causes the test case to fail when evaluated. See KUNIT_EXPECT_TRUE()
+ * for more information.
+ */
+#define KUNIT_FAIL(test, fmt, ...)					       \
+		KUNIT_FAIL_ASSERTION(test,				       \
+				     KUNIT_EXPECTATION,			       \
+				     fmt,				       \
+				     ##__VA_ARGS__)
+
+#define KUNIT_UNARY_ASSERTION(test,					       \
+			      assert_type,				       \
+			      condition,				       \
+			      expected_true,				       \
+			      fmt,					       \
+			      ...)					       \
+		KUNIT_ASSERTION(test,					       \
+				!!(condition) == !!expected_true,	       \
+				kunit_unary_assert,			       \
+				KUNIT_INIT_UNARY_ASSERT_STRUCT(test,	       \
+							       assert_type,    \
+							       #condition,     \
+							       expected_true), \
+				fmt,					       \
+				##__VA_ARGS__)
+
+#define KUNIT_TRUE_MSG_ASSERTION(test, assert_type, condition, fmt, ...)       \
+		KUNIT_UNARY_ASSERTION(test,				       \
+				      assert_type,			       \
+				      condition,			       \
+				      true,				       \
+				      fmt,				       \
+				      ##__VA_ARGS__)
+
+#define KUNIT_TRUE_ASSERTION(test, assert_type, condition) \
+		KUNIT_TRUE_MSG_ASSERTION(test, assert_type, condition, NULL)
+
+#define KUNIT_FALSE_MSG_ASSERTION(test, assert_type, condition, fmt, ...)      \
+		KUNIT_UNARY_ASSERTION(test,				       \
+				      assert_type,			       \
+				      condition,			       \
+				      false,				       \
+				      fmt,				       \
+				      ##__VA_ARGS__)
+
+#define KUNIT_FALSE_ASSERTION(test, assert_type, condition) \
+		KUNIT_FALSE_MSG_ASSERTION(test, assert_type, condition, NULL)
+
+#define KUNIT_BINARY_CLASS \
+		kunit_binary_assert, KUNIT_INIT_BINARY_ASSERT_STRUCT
+#define KUNIT_BINARY_PTR_CLASS \
+		kunit_binary_ptr_assert, KUNIT_INIT_BINARY_PTR_ASSERT_STRUCT
+
+/*
+ * A factory macro for defining the assertions andexpectations for the basic
+ * comparisons defined for the built in types.
+ *
+ * Unfortunately, there is no common type that all types can be promoted to for
+ * which all the binary operators behave the same way as for the actual types
+ * (for example, there is no type that long long and unsigned long long can
+ * both be cast to where the comparison result is preserved for all values). So
+ * the best we can do is do the comparison in the original types and then coerce
+ * everything to long long for printing; this way, the comparison behaves
+ * correctly and the printed out value usually makes sense without
+ * interpretation, but can always be interpretted to figure out the actual
+ * value.
+ */
+#define KUNIT_BASE_BINARY_ASSERTION(test,				       \
+				    assert_class,			       \
+				    ASSERT_CLASS_INIT,			       \
+				    assert_type,			       \
+				    left,				       \
+				    op,					       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+do {									       \
+	typeof(left) __left = (left);					       \
+	typeof(right) __right = (right);				       \
+	__kunit_typecheck(__left, __right);				       \
+									       \
+	KUNIT_ASSERTION(test,						       \
+			__left op __right,				       \
+			assert_class,					       \
+			ASSERT_CLASS_INIT(test,				       \
+					  assert_type,			       \
+					  #op,				       \
+					  #left,			       \
+					  __left,			       \
+					  #right,			       \
+					  __right),			       \
+			fmt,						       \
+			##__VA_ARGS__);					       \
+} while (0)
+
+#define KUNIT_BINARY_ASSERTION(test, assert_type, left, op, right, fmt, ...)   \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    kunit_binary_assert,	       \
+					    KUNIT_INIT_BINARY_ASSERT_STRUCT,   \
+					    assert_type,		       \
+					    left,			       \
+					    op,				       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_EQ_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, ==, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_NE_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, !=, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_LT_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, <, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_LE_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, <=, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_GT_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, >, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BASE_GE_MSG_ASSERTION(test,				       \
+				    ASSERT_CLASS,			       \
+				    assert_type,			       \
+				    left,				       \
+				    right,				       \
+				    fmt,				       \
+				    ...)				       \
+		KUNIT_BASE_BINARY_ASSERTION(test,			       \
+					    ASSERT_CLASS,		       \
+					    assert_type,		       \
+					    left, >=, right,		       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_EQ_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_EQ_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_EQ_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_EQ_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_EQ_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_EQ_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_EQ_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_EQ_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_NE_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_NE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_NE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_NE_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_NE_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_NE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_NE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_NE_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_LT_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_LT_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_LT_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_LT_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_LT_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_LT_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_LT_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_LT_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_LE_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_LE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_LE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_LE_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_LE_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_LE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_LE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_LE_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_GT_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_GT_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_GT_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_GT_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_GT_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_GT_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_GT_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_GT_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_GE_MSG_ASSERTION(test, assert_type, left, right, fmt, ...)\
+		KUNIT_BASE_GE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_CLASS,		       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_GE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_GE_MSG_ASSERTION(test,			       \
+					      assert_type,		       \
+					      left,			       \
+					      right,			       \
+					      NULL)
+
+#define KUNIT_BINARY_PTR_GE_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BASE_GE_MSG_ASSERTION(test,			       \
+					    KUNIT_BINARY_PTR_CLASS,	       \
+					    assert_type,		       \
+					    left,			       \
+					    right,			       \
+					    fmt,			       \
+					    ##__VA_ARGS__)
+
+#define KUNIT_BINARY_PTR_GE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_PTR_GE_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_STR_ASSERTION(test,				       \
+				   assert_type,				       \
+				   left,				       \
+				   op,					       \
+				   right,				       \
+				   fmt,					       \
+				   ...)					       \
+do {									       \
+	typeof(left) __left = (left);					       \
+	typeof(right) __right = (right);				       \
+									       \
+	KUNIT_ASSERTION(test,						       \
+			strcmp(__left, __right) op 0,			       \
+			kunit_binary_str_assert,			       \
+			KUNIT_INIT_BINARY_ASSERT_STRUCT(test,		       \
+							assert_type,	       \
+							#op,		       \
+							#left,		       \
+							__left,		       \
+							#right,		       \
+							__right),	       \
+			fmt,						       \
+			##__VA_ARGS__);					       \
+} while (0)
+
+#define KUNIT_BINARY_STR_EQ_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BINARY_STR_ASSERTION(test,			       \
+					   assert_type,			       \
+					   left, ==, right,		       \
+					   fmt,				       \
+					   ##__VA_ARGS__)
+
+#define KUNIT_BINARY_STR_EQ_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_STR_EQ_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,				       \
+					  assert_type,			       \
+					  left,				       \
+					  right,			       \
+					  fmt,				       \
+					  ...)				       \
+		KUNIT_BINARY_STR_ASSERTION(test,			       \
+					   assert_type,			       \
+					   left, !=, right,		       \
+					   fmt,				       \
+					   ##__VA_ARGS__)
+
+#define KUNIT_BINARY_STR_NE_ASSERTION(test, assert_type, left, right)	       \
+		KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,			       \
+						  assert_type,		       \
+						  left,			       \
+						  right,		       \
+						  NULL)
+
+#define KUNIT_PTR_NOT_ERR_OR_NULL_MSG_ASSERTION(test,			       \
+						assert_type,		       \
+						ptr,			       \
+						fmt,			       \
+						...)			       \
+do {									       \
+	typeof(ptr) __ptr = (ptr);					       \
+									       \
+	KUNIT_ASSERTION(test,						       \
+			!IS_ERR_OR_NULL(__ptr),				       \
+			kunit_ptr_not_err_assert,			       \
+			KUNIT_INIT_PTR_NOT_ERR_STRUCT(test,		       \
+						      assert_type,	       \
+						      #ptr,		       \
+						      __ptr),		       \
+			fmt,						       \
+			##__VA_ARGS__);					       \
+} while (0)
+
+#define KUNIT_PTR_NOT_ERR_OR_NULL_ASSERTION(test, assert_type, ptr)	       \
+		KUNIT_PTR_NOT_ERR_OR_NULL_MSG_ASSERTION(test,		       \
+							assert_type,	       \
+							ptr,		       \
+							NULL)
+
+/**
+ * KUNIT_EXPECT_TRUE() - Causes a test failure when the expression is not true.
+ * @test: The test context object.
+ * @condition: an arbitrary boolean expression. The test fails when this does
+ * not evaluate to true.
+ *
+ * This and expectations of the form `KUNIT_EXPECT_*` will cause the test case
+ * to fail when the specified condition is not met; however, it will not prevent
+ * the test case from continuing to run; this is otherwise known as an
+ * *expectation failure*.
+ */
+#define KUNIT_EXPECT_TRUE(test, condition) \
+		KUNIT_TRUE_ASSERTION(test, KUNIT_EXPECTATION, condition)
+
+#define KUNIT_EXPECT_TRUE_MSG(test, condition, fmt, ...)		       \
+		KUNIT_TRUE_MSG_ASSERTION(test,				       \
+					 KUNIT_EXPECTATION,		       \
+					 condition,			       \
+					 fmt,				       \
+					 ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_FALSE() - Makes a test failure when the expression is not false.
+ * @test: The test context object.
+ * @condition: an arbitrary boolean expression. The test fails when this does
+ * not evaluate to false.
+ *
+ * Sets an expectation that @condition evaluates to false. See
+ * KUNIT_EXPECT_TRUE() for more information.
+ */
+#define KUNIT_EXPECT_FALSE(test, condition) \
+		KUNIT_FALSE_ASSERTION(test, KUNIT_EXPECTATION, condition)
+
+#define KUNIT_EXPECT_FALSE_MSG(test, condition, fmt, ...)		       \
+		KUNIT_FALSE_MSG_ASSERTION(test,				       \
+					  KUNIT_EXPECTATION,		       \
+					  condition,			       \
+					  fmt,				       \
+					  ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_EQ() - Sets an expectation that @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are
+ * equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) == (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_EQ(test, left, right) \
+		KUNIT_BINARY_EQ_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_EQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_EQ_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_PTR_EQ() - Expects that pointers @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a pointer.
+ * @right: an arbitrary expression that evaluates to a pointer.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are
+ * equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) == (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_PTR_EQ(test, left, right)				       \
+		KUNIT_BINARY_PTR_EQ_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right)
+
+#define KUNIT_EXPECT_PTR_EQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_PTR_EQ_MSG_ASSERTION(test,			       \
+						  KUNIT_EXPECTATION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_NE() - An expectation that @left and @right are not equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are not
+ * equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) != (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_NE(test, left, right) \
+		KUNIT_BINARY_NE_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_NE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_NE_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_PTR_NE() - Expects that pointers @left and @right are not equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a pointer.
+ * @right: an arbitrary expression that evaluates to a pointer.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are not
+ * equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) != (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_PTR_NE(test, left, right)				       \
+		KUNIT_BINARY_PTR_NE_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right)
+
+#define KUNIT_EXPECT_PTR_NE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_PTR_NE_MSG_ASSERTION(test,			       \
+						  KUNIT_EXPECTATION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_LT() - An expectation that @left is less than @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the value that @left evaluates to is less than the
+ * value that @right evaluates to. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) < (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_LT(test, left, right) \
+		KUNIT_BINARY_LT_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_LT_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_LT_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_LE() - Expects that @left is less than or equal to @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the value that @left evaluates to is less than or
+ * equal to the value that @right evaluates to. Semantically this is equivalent
+ * to KUNIT_EXPECT_TRUE(@test, (@left) <= (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_LE(test, left, right) \
+		KUNIT_BINARY_LE_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_LE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_LE_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_GT() - An expectation that @left is greater than @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the value that @left evaluates to is greater than
+ * the value that @right evaluates to. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) > (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_GT(test, left, right) \
+		KUNIT_BINARY_GT_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_GT_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_GT_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_GE() - Expects that @left is greater than or equal to @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an expectation that the value that @left evaluates to is greater than
+ * the value that @right evaluates to. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, (@left) >= (@right)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_GE(test, left, right) \
+		KUNIT_BINARY_GE_ASSERTION(test, KUNIT_EXPECTATION, left, right)
+
+#define KUNIT_EXPECT_GE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_GE_MSG_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_STREQ() - Expects that strings @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a null terminated string.
+ * @right: an arbitrary expression that evaluates to a null terminated string.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are
+ * equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, !strcmp((@left), (@right))). See KUNIT_EXPECT_TRUE()
+ * for more information.
+ */
+#define KUNIT_EXPECT_STREQ(test, left, right)				       \
+		KUNIT_BINARY_STR_EQ_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right)
+
+#define KUNIT_EXPECT_STREQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_STR_EQ_MSG_ASSERTION(test,			       \
+						  KUNIT_EXPECTATION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_STRNEQ() - Expects that strings @left and @right are not equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a null terminated string.
+ * @right: an arbitrary expression that evaluates to a null terminated string.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are
+ * not equal. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, strcmp((@left), (@right))). See KUNIT_EXPECT_TRUE()
+ * for more information.
+ */
+#define KUNIT_EXPECT_STRNEQ(test, left, right)				       \
+		KUNIT_BINARY_STR_NE_ASSERTION(test,			       \
+					      KUNIT_EXPECTATION,	       \
+					      left,			       \
+					      right)
+
+#define KUNIT_EXPECT_STRNEQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,			       \
+						  KUNIT_EXPECTATION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_EXPECT_NOT_ERR_OR_NULL() - Expects that @ptr is not null and not err.
+ * @test: The test context object.
+ * @ptr: an arbitrary pointer.
+ *
+ * Sets an expectation that the value that @ptr evaluates to is not null and not
+ * an errno stored in a pointer. This is semantically equivalent to
+ * KUNIT_EXPECT_TRUE(@test, !IS_ERR_OR_NULL(@ptr)). See KUNIT_EXPECT_TRUE() for
+ * more information.
+ */
+#define KUNIT_EXPECT_NOT_ERR_OR_NULL(test, ptr)				       \
+		KUNIT_PTR_NOT_ERR_OR_NULL_ASSERTION(test,		       \
+						    KUNIT_EXPECTATION,	       \
+						    ptr)
+
+#define KUNIT_EXPECT_NOT_ERR_OR_NULL_MSG(test, ptr, fmt, ...)		       \
+		KUNIT_PTR_NOT_ERR_OR_NULL_MSG_ASSERTION(test,		       \
+							KUNIT_EXPECTATION,     \
+							ptr,		       \
+							fmt,		       \
+							##__VA_ARGS__)
+
 #endif /* _KUNIT_TEST_H */
diff --git a/kunit/test.c b/kunit/test.c
index 4c178a817f2fe..e5080a2c6b29c 100644
--- a/kunit/test.c
+++ b/kunit/test.c
@@ -120,6 +120,64 @@ static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
 			      test_case->name);
 }
 
+static void kunit_print_string_stream(struct kunit *test,
+				      struct string_stream *stream)
+{
+	struct string_stream_fragment *fragment;
+	char *buf;
+
+	buf = string_stream_get_string(stream);
+	if (!buf) {
+		kunit_err(test,
+			  "Could not allocate buffer, dumping stream:\n");
+		list_for_each_entry(fragment, &stream->fragments, node) {
+			kunit_err(test, fragment->fragment);
+		}
+		kunit_err(test, "\n");
+	} else {
+		kunit_err(test, buf);
+	}
+}
+
+static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
+{
+	struct string_stream *stream;
+
+	kunit_set_failure(test);
+
+	stream = alloc_string_stream(test, GFP_KERNEL);
+	if (!stream) {
+		warn_slowpath_fmt(assert->file,
+				  assert->line,
+				  "Could not allocate stream to print failed assertion.\n");
+		return;
+	}
+
+	assert->format(assert, stream);
+
+	kunit_print_string_stream(test, stream);
+}
+
+void kunit_do_assertion(struct kunit *test,
+			struct kunit_assert *assert,
+			bool pass,
+			const char *fmt, ...)
+{
+	va_list args;
+
+	if (pass)
+		return;
+
+	va_start(args, fmt);
+
+	assert->message.fmt = fmt;
+	assert->message.va = &args;
+
+	kunit_fail(test, assert);
+
+	va_end(args);
+}
+
 void kunit_init_test(struct kunit *test, const char *name)
 {
 	spin_lock_init(&test->lock);
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 05/18] kunit: test: add the concept of expectations

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:08)
> Add support for expectations, which allow properties to be specified and
> then verified in tests.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

Just some minor nits again.

> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index d0bf112910caf..2625bcfeb19ac 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -9,8 +9,10 @@
>  #ifndef _KUNIT_TEST_H
>  #define _KUNIT_TEST_H
>  
> +#include <linux/kernel.h>
>  #include <linux/types.h>
>  #include <linux/slab.h>
> +#include <kunit/assert.h>

Can you alphabet sort these?

>  
>  struct kunit_resource;
>  
> @@ -319,4 +321,845 @@ void __printf(3, 4) kunit_printk(const char *level,
>  #define kunit_err(test, fmt, ...) \
>                 kunit_printk(KERN_ERR, test, fmt, ##__VA_ARGS__)
>  
> +/*
> + * Generates a compile-time warning in case of comparing incompatible types.
> + */
> +#define __kunit_typecheck(lhs, rhs) \
> +       ((void) __typecheck(lhs, rhs))

Is there a reason why this can't be inlined and the __kunit_typecheck()
macro can't be removed?

> +
> +/**
> + * KUNIT_SUCCEED() - A no-op expectation. Only exists for code clarity.
> + * @test: The test context object.
[...]
> + * @condition: an arbitrary boolean expression. The test fails when this does
> + * not evaluate to true.
> + *
> + * This and expectations of the form `KUNIT_EXPECT_*` will cause the test case
> + * to fail when the specified condition is not met; however, it will not prevent
> + * the test case from continuing to run; this is otherwise known as an
> + * *expectation failure*.
> + */
> +#define KUNIT_EXPECT_TRUE(test, condition) \
> +               KUNIT_TRUE_ASSERTION(test, KUNIT_EXPECTATION, condition)

A lot of these macros seem double indented.

> +
> +#define KUNIT_EXPECT_TRUE_MSG(test, condition, fmt, ...)                      \
> +               KUNIT_TRUE_MSG_ASSERTION(test,                                 \
> +                                        KUNIT_EXPECTATION,                    \
> +                                        condition,                            \
> +                                        fmt,                                  \
> +                                        ##__VA_ARGS__)
> +

Re: [PATCH v12 05/18] kunit: test: add the concept of expectations

[Brendan Higgins]

On Mon, Aug 12, 2019 at 04:57:00PM -0700, Stephen Boyd wrote:
> Quoting Brendan Higgins (2019-08-12 11:24:08)
> > Add support for expectations, which allow properties to be specified and
> > then verified in tests.
> > 
> > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> 
> Reviewed-by: Stephen Boyd <sboyd@kernel.org>
> 
> Just some minor nits again.
> 
> > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > index d0bf112910caf..2625bcfeb19ac 100644
> > --- a/include/kunit/test.h
> > +++ b/include/kunit/test.h
> > @@ -9,8 +9,10 @@
> >  #ifndef _KUNIT_TEST_H
> >  #define _KUNIT_TEST_H
> >  
> > +#include <linux/kernel.h>
> >  #include <linux/types.h>
> >  #include <linux/slab.h>
> > +#include <kunit/assert.h>
> 
> Can you alphabet sort these?

Sure. Will fix.

> >  
> >  struct kunit_resource;
> >  
> > @@ -319,4 +321,845 @@ void __printf(3, 4) kunit_printk(const char *level,
> >  #define kunit_err(test, fmt, ...) \
> >                 kunit_printk(KERN_ERR, test, fmt, ##__VA_ARGS__)
> >  
> > +/*
> > + * Generates a compile-time warning in case of comparing incompatible types.
> > + */
> > +#define __kunit_typecheck(lhs, rhs) \
> > +       ((void) __typecheck(lhs, rhs))
> 
> Is there a reason why this can't be inlined and the __kunit_typecheck()
> macro can't be removed?

No real reason anymore. I used it in multiple places before and we
weren't sure if we wanted to stick with the warnings that __typecheck
produces long term, but now that it is only used in one place, I guess
that doesn't make sense anymore. Will fix.

> > +
> > +/**
> > + * KUNIT_SUCCEED() - A no-op expectation. Only exists for code clarity.
> > + * @test: The test context object.
> [...]
> > + * @condition: an arbitrary boolean expression. The test fails when this does
> > + * not evaluate to true.
> > + *
> > + * This and expectations of the form `KUNIT_EXPECT_*` will cause the test case
> > + * to fail when the specified condition is not met; however, it will not prevent
> > + * the test case from continuing to run; this is otherwise known as an
> > + * *expectation failure*.
> > + */
> > +#define KUNIT_EXPECT_TRUE(test, condition) \
> > +               KUNIT_TRUE_ASSERTION(test, KUNIT_EXPECTATION, condition)
> 
> A lot of these macros seem double indented.

In a case you pointed out in the preceding patch, I was just keeping the
arguments column aligned.

In this case I am just indenting two tabs for a line continuation. I
thought I found other instances in the kernel that did this early on
(and that's also what the Linux kernel vim plugin wanted me to do).
After a couple of spot checks, it seems like one tab for this kind of
line continuation seems more common. I personally don't feel strongly
about any particular version. I just want to know now what the correct
indentation is for macros before I go through and change them all.

I think there are three cases:

#define macro0(param0, param1) \
		a_really_long_macro(...)

In this first case, I use two tabs for the first indent, I think you are
telling me this should be one tab.

#define macro1(param0, param1) {					       \
	statement_in_a_block0;						       \
	statement_in_a_block1;						       \
	...								       \
}

In this case, every line is in a block and is indented as it would be in
a function body. I think you are okay with this, and now that I am
thinking about it, what I think you are proposing for macro0 will make
these two cases more consistent.

#define macro2(param0,							       \
	       param1,							       \
	       param2,							       \
	       param3,							       \
	       ...,							       \
	       paramn) ...						       \

In this last case, the body would be indented as in macro0, or macro1,
but the parameters passed into the macro are column aligned, consistent
with one of the acceptable ways of formatting function parameters that
don't fit on a single line.

In all cases, I put 1 space in between the closing parameter paren and
the line continuation `\`, if only one `\` is needed. Otherwise, I align
all the `\s` to the 80th column. Is this okay, or would you prefer that
I align them all to the 80th column, or something else?

> > +
> > +#define KUNIT_EXPECT_TRUE_MSG(test, condition, fmt, ...)                      \
> > +               KUNIT_TRUE_MSG_ASSERTION(test,                                 \
> > +                                        KUNIT_EXPECTATION,                    \
> > +                                        condition,                            \
> > +                                        fmt,                                  \
> > +                                        ##__VA_ARGS__)
> > +

Re: [PATCH v12 05/18] kunit: test: add the concept of expectations

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 17:33:52)
> On Mon, Aug 12, 2019 at 04:57:00PM -0700, Stephen Boyd wrote:
> > Quoting Brendan Higgins (2019-08-12 11:24:08)
> > > + */
> > > +#define KUNIT_EXPECT_TRUE(test, condition) \
> > > +               KUNIT_TRUE_ASSERTION(test, KUNIT_EXPECTATION, condition)
> > 
> > A lot of these macros seem double indented.
> 
> In a case you pointed out in the preceding patch, I was just keeping the
> arguments column aligned.
> 
> In this case I am just indenting two tabs for a line continuation. I
> thought I found other instances in the kernel that did this early on
> (and that's also what the Linux kernel vim plugin wanted me to do).
> After a couple of spot checks, it seems like one tab for this kind of
> line continuation seems more common. I personally don't feel strongly
> about any particular version. I just want to know now what the correct
> indentation is for macros before I go through and change them all.
> 
> I think there are three cases:
> 
> #define macro0(param0, param1) \
>                 a_really_long_macro(...)
> 
> In this first case, I use two tabs for the first indent, I think you are
> telling me this should be one tab.

Yes. Should be one.

> 
> #define macro1(param0, param1) {                                               \
>         statement_in_a_block0;                                                 \
>         statement_in_a_block1;                                                 \
>         ...                                                                    \
> }
> 
> In this case, every line is in a block and is indented as it would be in
> a function body. I think you are okay with this, and now that I am
> thinking about it, what I think you are proposing for macro0 will make
> these two cases more consistent.
> 
> #define macro2(param0,                                                         \
>                param1,                                                         \
>                param2,                                                         \
>                param3,                                                         \
>                ...,                                                            \
>                paramn) ...                                                     \
> 
> In this last case, the body would be indented as in macro0, or macro1,
> but the parameters passed into the macro are column aligned, consistent
> with one of the acceptable ways of formatting function parameters that
> don't fit on a single line.
> 
> In all cases, I put 1 space in between the closing parameter paren and
> the line continuation `\`, if only one `\` is needed. Otherwise, I align
> all the `\s` to the 80th column. Is this okay, or would you prefer that
> I align them all to the 80th column, or something else?
> 

This all sounds fine and I'm not nitpicking this style. Just the double
tabs making lines longer than required.

Re: [PATCH v12 05/18] kunit: test: add the concept of expectations

[Brendan Higgins]

On Mon, Aug 12, 2019 at 10:02 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 17:33:52)
> > On Mon, Aug 12, 2019 at 04:57:00PM -0700, Stephen Boyd wrote:
> > > Quoting Brendan Higgins (2019-08-12 11:24:08)
> > > > + */
> > > > +#define KUNIT_EXPECT_TRUE(test, condition) \
> > > > +               KUNIT_TRUE_ASSERTION(test, KUNIT_EXPECTATION, condition)
> > >
> > > A lot of these macros seem double indented.
> >
> > In a case you pointed out in the preceding patch, I was just keeping the
> > arguments column aligned.
> >
> > In this case I am just indenting two tabs for a line continuation. I
> > thought I found other instances in the kernel that did this early on
> > (and that's also what the Linux kernel vim plugin wanted me to do).
> > After a couple of spot checks, it seems like one tab for this kind of
> > line continuation seems more common. I personally don't feel strongly
> > about any particular version. I just want to know now what the correct
> > indentation is for macros before I go through and change them all.
> >
> > I think there are three cases:
> >
> > #define macro0(param0, param1) \
> >                 a_really_long_macro(...)
> >
> > In this first case, I use two tabs for the first indent, I think you are
> > telling me this should be one tab.
>
> Yes. Should be one.
>
> >
> > #define macro1(param0, param1) {                                               \
> >         statement_in_a_block0;                                                 \
> >         statement_in_a_block1;                                                 \
> >         ...                                                                    \
> > }
> >
> > In this case, every line is in a block and is indented as it would be in
> > a function body. I think you are okay with this, and now that I am
> > thinking about it, what I think you are proposing for macro0 will make
> > these two cases more consistent.
> >
> > #define macro2(param0,                                                         \
> >                param1,                                                         \
> >                param2,                                                         \
> >                param3,                                                         \
> >                ...,                                                            \
> >                paramn) ...                                                     \
> >
> > In this last case, the body would be indented as in macro0, or macro1,
> > but the parameters passed into the macro are column aligned, consistent
> > with one of the acceptable ways of formatting function parameters that
> > don't fit on a single line.
> >
> > In all cases, I put 1 space in between the closing parameter paren and
> > the line continuation `\`, if only one `\` is needed. Otherwise, I align
> > all the `\s` to the 80th column. Is this okay, or would you prefer that
> > I align them all to the 80th column, or something else?
> >
>
> This all sounds fine and I'm not nitpicking this style. Just the double
> tabs making lines longer than required.

Sounds good. Will do.

[PATCH v12 06/18] kbuild: enable building KUnit

[Brendan Higgins]

KUnit is a new unit testing framework for the kernel and when used is
built into the kernel as a part of it. Add KUnit to the root Kconfig and
Makefile to allow it to be actually built.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michal Marek <michal.lkml@markovi.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
---
 Kconfig  | 2 ++
 Makefile | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/Kconfig b/Kconfig
index e10b3ee084d4d..47886dbd6c2a6 100644
--- a/Kconfig
+++ b/Kconfig
@@ -32,3 +32,5 @@ source "lib/Kconfig"
 source "lib/Kconfig.debug"
 
 source "Documentation/Kconfig"
+
+source "kunit/Kconfig"
diff --git a/Makefile b/Makefile
index 23cdf1f413646..3795d0a5d0376 100644
--- a/Makefile
+++ b/Makefile
@@ -1005,6 +1005,8 @@ PHONY += prepare0
 ifeq ($(KBUILD_EXTMOD),)
 core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
 
+core-$(CONFIG_KUNIT) += kunit/
+
 vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
 		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
 		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
-- 
2.23.0.rc1.153.gdeed80330f-goog

[PATCH v12 07/18] kunit: test: add initial tests

[Brendan Higgins]

Add a test for string stream along with a simpler example.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 kunit/Kconfig              | 21 +++++++++
 kunit/Makefile             |  4 ++
 kunit/example-test.c       | 88 ++++++++++++++++++++++++++++++++++++++
 kunit/string-stream-test.c | 74 ++++++++++++++++++++++++++++++++
 4 files changed, 187 insertions(+)
 create mode 100644 kunit/example-test.c
 create mode 100644 kunit/string-stream-test.c

diff --git a/kunit/Kconfig b/kunit/Kconfig
index 330ae83527c23..8541ef95b65ad 100644
--- a/kunit/Kconfig
+++ b/kunit/Kconfig
@@ -14,4 +14,25 @@ config KUNIT
 	  architectures. For more information, please see
 	  Documentation/dev-tools/kunit/.
 
+config KUNIT_TEST
+	bool "KUnit test for KUnit"
+	depends on KUNIT
+	help
+	  Enables the unit tests for the KUnit test framework. These tests test
+	  the KUnit test framework itself; the tests are both written using
+	  KUnit and test KUnit. This option should only be enabled for testing
+	  purposes by developers interested in testing that KUnit works as
+	  expected.
+
+config KUNIT_EXAMPLE_TEST
+	bool "Example test for KUnit"
+	depends on KUNIT
+	help
+	  Enables an example unit test that illustrates some of the basic
+	  features of KUnit. This test only exists to help new users understand
+	  what KUnit is and how it is used. Please refer to the example test
+	  itself, kunit/example-test.c, for more information. This option is
+	  intended for curious hackers who would like to understand how to use
+	  KUnit for kernel development.
+
 endmenu
diff --git a/kunit/Makefile b/kunit/Makefile
index 6dcbe309036b8..4e46450bcb3a8 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1,3 +1,7 @@
 obj-$(CONFIG_KUNIT) +=			test.o \
 					string-stream.o \
 					assert.o
+
+obj-$(CONFIG_KUNIT_TEST) +=		string-stream-test.o
+
+obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=	example-test.o
diff --git a/kunit/example-test.c b/kunit/example-test.c
new file mode 100644
index 0000000000000..f64a829aa441f
--- /dev/null
+++ b/kunit/example-test.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Example KUnit test to show how to use KUnit.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/test.h>
+
+/*
+ * This is the most fundamental element of KUnit, the test case. A test case
+ * makes a set EXPECTATIONs and ASSERTIONs about the behavior of some code; if
+ * any expectations or assertions are not met, the test fails; otherwise, the
+ * test passes.
+ *
+ * In KUnit, a test case is just a function with the signature
+ * `void (*)(struct kunit *)`. `struct kunit` is a context object that stores
+ * information about the current test.
+ */
+static void example_simple_test(struct kunit *test)
+{
+	/*
+	 * This is an EXPECTATION; it is how KUnit tests things. When you want
+	 * to test a piece of code, you set some expectations about what the
+	 * code should do. KUnit then runs the test and verifies that the code's
+	 * behavior matched what was expected.
+	 */
+	KUNIT_EXPECT_EQ(test, 1 + 1, 2);
+}
+
+/*
+ * This is run once before each test case, see the comment on
+ * example_test_suite for more information.
+ */
+static int example_test_init(struct kunit *test)
+{
+	kunit_info(test, "initializing\n");
+
+	return 0;
+}
+
+/*
+ * Here we make a list of all the test cases we want to add to the test suite
+ * below.
+ */
+static struct kunit_case example_test_cases[] = {
+	/*
+	 * This is a helper to create a test case object from a test case
+	 * function; its exact function is not important to understand how to
+	 * use KUnit, just know that this is how you associate test cases with a
+	 * test suite.
+	 */
+	KUNIT_CASE(example_simple_test),
+	{}
+};
+
+/*
+ * This defines a suite or grouping of tests.
+ *
+ * Test cases are defined as belonging to the suite by adding them to
+ * `kunit_cases`.
+ *
+ * Often it is desirable to run some function which will set up things which
+ * will be used by every test; this is accomplished with an `init` function
+ * which runs before each test case is invoked. Similarly, an `exit` function
+ * may be specified which runs after every test case and can be used to for
+ * cleanup. For clarity, running tests in a test suite would behave as follows:
+ *
+ * suite.init(test);
+ * suite.test_case[0](test);
+ * suite.exit(test);
+ * suite.init(test);
+ * suite.test_case[1](test);
+ * suite.exit(test);
+ * ...;
+ */
+static struct kunit_suite example_test_suite = {
+	.name = "example",
+	.init = example_test_init,
+	.test_cases = example_test_cases,
+};
+
+/*
+ * This registers the above test suite telling KUnit that this is a suite of
+ * tests that need to be run.
+ */
+kunit_test_suite(example_test_suite);
diff --git a/kunit/string-stream-test.c b/kunit/string-stream-test.c
new file mode 100644
index 0000000000000..9cf08f9dadf36
--- /dev/null
+++ b/kunit/string-stream-test.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for struct string_stream.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <linux/slab.h>
+#include <kunit/test.h>
+#include <kunit/string-stream.h>
+
+static void string_stream_test_empty_on_creation(struct kunit *test)
+{
+	struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+
+	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+}
+
+static void string_stream_test_not_empty_after_add(struct kunit *test)
+{
+	struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+
+	string_stream_add(stream, "Foo");
+
+	KUNIT_EXPECT_FALSE(test, string_stream_is_empty(stream));
+}
+
+static void string_stream_test_get_string(struct kunit *test)
+{
+	struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+	char *output;
+
+	string_stream_add(stream, "Foo");
+	string_stream_add(stream, " %s", "bar");
+
+	output = string_stream_get_string(stream);
+	KUNIT_EXPECT_STREQ(test, output, "Foo bar");
+}
+
+static void string_stream_test_add_and_clear(struct kunit *test)
+{
+	struct string_stream *stream = alloc_string_stream(test, GFP_KERNEL);
+	char *output;
+	int i;
+
+	for (i = 0; i < 10; i++)
+		string_stream_add(stream, "A");
+
+	output = string_stream_get_string(stream);
+	KUNIT_EXPECT_STREQ(test, output, "AAAAAAAAAA");
+	KUNIT_EXPECT_EQ(test, stream->length, (size_t)10);
+	KUNIT_EXPECT_FALSE(test, string_stream_is_empty(stream));
+
+	string_stream_clear(stream);
+
+	output = string_stream_get_string(stream);
+	KUNIT_EXPECT_STREQ(test, output, "");
+	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+}
+
+static struct kunit_case string_stream_test_cases[] = {
+	KUNIT_CASE(string_stream_test_empty_on_creation),
+	KUNIT_CASE(string_stream_test_not_empty_after_add),
+	KUNIT_CASE(string_stream_test_get_string),
+	KUNIT_CASE(string_stream_test_add_and_clear),
+	{}
+};
+
+static struct kunit_suite string_stream_test_suite = {
+	.name = "string-stream-test",
+	.test_cases = string_stream_test_cases
+};
+kunit_test_suite(string_stream_test_suite);
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 07/18] kunit: test: add initial tests

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:10)
> Add a test for string stream along with a simpler example.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

[PATCH v12 08/18] objtool: add kunit_try_catch_throw to the noreturn list

[Brendan Higgins]

Fix the following warning seen on GCC 7.3:
  kunit/test-test.o: warning: objtool: kunit_test_unsuccessful_try() falls through to next function kunit_test_catch()

kunit_try_catch_throw is a function added in the following patch in this
series; it allows KUnit, a unit testing framework for the kernel, to
bail out of a broken test. As a consequence, it is a new __noreturn
function that objtool thinks is broken (as seen above). So fix this
warning by adding kunit_try_catch_throw to objtool's noreturn list.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://www.spinics.net/lists/linux-kbuild/msg21708.html
Cc: Peter Zijlstra <peterz@infradead.org>
---
 tools/objtool/check.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 176f2f0840609..0c8e17f946cda 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -145,6 +145,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"usercopy_abort",
 		"machine_real_restart",
 		"rewind_stack_do_exit",
+		"kunit_try_catch_throw",
 	};
 
 	if (!func)
-- 
2.23.0.rc1.153.gdeed80330f-goog

[PATCH v12 09/18] kunit: test: add support for test abort

[Brendan Higgins]

Add support for aborting/bailing out of test cases, which is needed for
implementing assertions.

An assertion is like an expectation, but bails out of the test case
early if the assertion is not met. The idea with assertions is that you
use them to state all the preconditions for your test. Logically
speaking, these are the premises of the test case, so if a premise isn't
true, there is no point in continuing the test case because there are no
conclusions that can be drawn without the premises. Whereas, the
expectation is the thing you are trying to prove.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 include/kunit/test.h      |  14 +++
 include/kunit/try-catch.h |  69 +++++++++++++++
 kunit/Makefile            |   3 +-
 kunit/test.c              | 179 ++++++++++++++++++++++++++++++++++----
 kunit/try-catch.c         |  95 ++++++++++++++++++++
 5 files changed, 344 insertions(+), 16 deletions(-)
 create mode 100644 include/kunit/try-catch.h
 create mode 100644 kunit/try-catch.c

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 2625bcfeb19ac..93381f841e09f 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -13,6 +13,7 @@
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <kunit/assert.h>
+#include <kunit/try-catch.h>
 
 struct kunit_resource;
 
@@ -167,6 +168,7 @@ struct kunit {
 
 	/* private: internal use only. */
 	const char *name; /* Read only after initialization! */
+	struct kunit_try_catch try_catch;
 	/*
 	 * success starts as true, and may only be set to false during a test
 	 * case; thus, it is safe to update this across multiple threads using
@@ -176,6 +178,11 @@ struct kunit {
 	 */
 	bool success; /* Read only after test_case finishes! */
 	spinlock_t lock; /* Gaurds all mutable test state. */
+	/*
+	 * death_test may be both set and unset from multiple threads in a test
+	 * case.
+	 */
+	bool death_test; /* Protected by lock. */
 	/*
 	 * Because resources is a list that may be updated multiple times (with
 	 * new resources) from any thread associated with a test case, we must
@@ -184,6 +191,13 @@ struct kunit {
 	struct list_head resources; /* Protected by lock. */
 };
 
+static inline void kunit_set_death_test(struct kunit *test, bool death_test)
+{
+	spin_lock(&test->lock);
+	test->death_test = death_test;
+	spin_unlock(&test->lock);
+}
+
 void kunit_init_test(struct kunit *test, const char *name);
 
 int kunit_run_tests(struct kunit_suite *suite);
diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h
new file mode 100644
index 0000000000000..8a414a9af0b64
--- /dev/null
+++ b/include/kunit/try-catch.h
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * An API to allow a function, that may fail, to be executed, and recover in a
+ * controlled manner.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#ifndef _KUNIT_TRY_CATCH_H
+#define _KUNIT_TRY_CATCH_H
+
+#include <linux/types.h>
+
+typedef void (*kunit_try_catch_func_t)(void *);
+
+struct kunit;
+
+/*
+ * struct kunit_try_catch - provides a generic way to run code which might fail.
+ * @context: used to pass user data to the try and catch functions.
+ *
+ * kunit_try_catch provides a generic, architecture independent way to execute
+ * an arbitrary function of type kunit_try_catch_func_t which may bail out by
+ * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
+ * is stopped at the site of invocation and @catch is catch is called.
+ *
+ * struct kunit_try_catch provides a generic interface for the functionality
+ * needed to implement kunit->abort() which in turn is needed for implementing
+ * assertions. Assertions allow stating a precondition for a test simplifying
+ * how test cases are written and presented.
+ *
+ * Assertions are like expectations, except they abort (call
+ * kunit_try_catch_throw()) when the specified condition is not met. This is
+ * useful when you look at a test case as a logical statement about some piece
+ * of code, where assertions are the premises for the test case, and the
+ * conclusion is a set of predicates, rather expectations, that must all be
+ * true. If your premises are violated, it does not makes sense to continue.
+ */
+struct kunit_try_catch {
+	/* private: internal use only. */
+	struct kunit *test;
+	struct completion *try_completion;
+	int try_result;
+	kunit_try_catch_func_t try;
+	kunit_try_catch_func_t catch;
+	void *context;
+};
+
+void kunit_try_catch_init(struct kunit_try_catch *try_catch,
+			  struct kunit *test,
+			  kunit_try_catch_func_t try,
+			  kunit_try_catch_func_t catch);
+
+void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context);
+
+void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch);
+
+static inline int kunit_try_catch_get_result(struct kunit_try_catch *try_catch)
+{
+	return try_catch->try_result;
+}
+
+/*
+ * Exposed for testing only.
+ */
+void kunit_generic_try_catch_init(struct kunit_try_catch *try_catch);
+
+#endif /* _KUNIT_TRY_CATCH_H */
diff --git a/kunit/Makefile b/kunit/Makefile
index 4e46450bcb3a8..c9176c9c578c6 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_KUNIT) +=			test.o \
 					string-stream.o \
-					assert.o
+					assert.o \
+					try-catch.o
 
 obj-$(CONFIG_KUNIT_TEST) +=		string-stream-test.o
 
diff --git a/kunit/test.c b/kunit/test.c
index e5080a2c6b29c..995cb53fe4ee9 100644
--- a/kunit/test.c
+++ b/kunit/test.c
@@ -7,13 +7,26 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/sched/debug.h>
 #include <kunit/test.h>
+#include <kunit/try-catch.h>
 
 static void kunit_set_failure(struct kunit *test)
 {
 	WRITE_ONCE(test->success, false);
 }
 
+static bool kunit_get_death_test(struct kunit *test)
+{
+	bool death_test;
+
+	spin_lock(&test->lock);
+	death_test = test->death_test;
+	spin_unlock(&test->lock);
+
+	return death_test;
+}
+
 static int kunit_vprintk_emit(int level, const char *fmt, va_list args)
 {
 	return vprintk_emit(0, level, NULL, 0, fmt, args);
@@ -158,6 +171,21 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
 	kunit_print_string_stream(test, stream);
 }
 
+void __noreturn kunit_abort(struct kunit *test)
+{
+	kunit_set_death_test(test, true);
+
+	kunit_try_catch_throw(&test->try_catch);
+
+	/*
+	 * Throw could not abort from test.
+	 *
+	 * XXX: we should never reach this line! As kunit_try_catch_throw is
+	 * marked __noreturn.
+	 */
+	WARN_ONCE(true, "Throw could not abort from test!\n");
+}
+
 void kunit_do_assertion(struct kunit *test,
 			struct kunit_assert *assert,
 			bool pass,
@@ -176,6 +204,9 @@ void kunit_do_assertion(struct kunit *test,
 	kunit_fail(test, assert);
 
 	va_end(args);
+
+	if (assert->type == KUNIT_ASSERTION)
+		kunit_abort(test);
 }
 
 void kunit_init_test(struct kunit *test, const char *name)
@@ -184,36 +215,154 @@ void kunit_init_test(struct kunit *test, const char *name)
 	INIT_LIST_HEAD(&test->resources);
 	test->name = name;
 	test->success = true;
+	test->death_test = false;
 }
 
 /*
- * Performs all logic to run a test case.
+ * Initializes and runs test case. Does not clean up or do post validations.
  */
-static void kunit_run_case(struct kunit_suite *suite,
-			   struct kunit_case *test_case)
+static void kunit_run_case_internal(struct kunit *test,
+				    struct kunit_suite *suite,
+				    struct kunit_case *test_case)
 {
-	struct kunit test;
-
-	kunit_init_test(&test, test_case->name);
-
 	if (suite->init) {
 		int ret;
 
-		ret = suite->init(&test);
+		ret = suite->init(test);
 		if (ret) {
-			kunit_err(&test, "failed to initialize: %d\n", ret);
-			kunit_set_failure(&test);
-			test_case->success = test.success;
+			kunit_err(test, "failed to initialize: %d\n", ret);
+			kunit_set_failure(test);
 			return;
 		}
 	}
 
-	test_case->run_case(&test);
+	test_case->run_case(test);
+}
+
+static void kunit_case_internal_cleanup(struct kunit *test)
+{
+	kunit_cleanup(test);
+}
 
+/*
+ * Performs post validations and cleanup after a test case was run.
+ * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
+ */
+static void kunit_run_case_cleanup(struct kunit *test,
+				   struct kunit_suite *suite)
+{
 	if (suite->exit)
-		suite->exit(&test);
+		suite->exit(test);
+
+	kunit_case_internal_cleanup(test);
+}
+
+/*
+ * Handles an unexpected crash in a test case.
+ */
+static void kunit_handle_test_crash(struct kunit *test,
+				   struct kunit_suite *suite,
+				   struct kunit_case *test_case)
+{
+	kunit_err(test, "kunit test case crashed!");
+	/*
+	 * TODO(brendanhiggins@google.com): This prints the stack trace up
+	 * through this frame, not up to the frame that caused the crash.
+	 */
+	show_stack(NULL, NULL);
+
+	kunit_case_internal_cleanup(test);
+}
+
+struct kunit_try_catch_context {
+	struct kunit *test;
+	struct kunit_suite *suite;
+	struct kunit_case *test_case;
+};
+
+static void kunit_try_run_case(void *data)
+{
+	struct kunit_try_catch_context *ctx = data;
+	struct kunit *test = ctx->test;
+	struct kunit_suite *suite = ctx->suite;
+	struct kunit_case *test_case = ctx->test_case;
+
+	/*
+	 * kunit_run_case_internal may encounter a fatal error; if it does,
+	 * abort will be called, this thread will exit, and finally the parent
+	 * thread will resume control and handle any necessary clean up.
+	 */
+	kunit_run_case_internal(test, suite, test_case);
+	/* This line may never be reached. */
+	kunit_run_case_cleanup(test, suite);
+}
+
+static void kunit_catch_run_case(void *data)
+{
+	struct kunit_try_catch_context *ctx = data;
+	struct kunit *test = ctx->test;
+	struct kunit_suite *suite = ctx->suite;
+	struct kunit_case *test_case = ctx->test_case;
+	int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
+
+	if (try_exit_code) {
+		kunit_set_failure(test);
+		/*
+		 * Test case could not finish, we have no idea what state it is
+		 * in, so don't do clean up.
+		 */
+		if (try_exit_code == -ETIMEDOUT)
+			kunit_err(test, "test case timed out\n");
+		/*
+		 * Unknown internal error occurred preventing test case from
+		 * running, so there is nothing to clean up.
+		 */
+		else
+			kunit_err(test, "internal error occurred preventing test case from running: %d\n",
+				  try_exit_code);
+		return;
+	}
+
+	if (kunit_get_death_test(test)) {
+		/*
+		 * EXPECTED DEATH: kunit_run_case_internal encountered
+		 * anticipated fatal error. Everything should be in a safe
+		 * state.
+		 */
+		kunit_run_case_cleanup(test, suite);
+	} else {
+		/*
+		 * UNEXPECTED DEATH: kunit_run_case_internal encountered an
+		 * unanticipated fatal error. We have no idea what the state of
+		 * the test case is in.
+		 */
+		kunit_handle_test_crash(test, suite, test_case);
+		kunit_set_failure(test);
+	}
+}
+
+/*
+ * Performs all logic to run a test case. It also catches most errors that
+ * occurs in a test case and reports them as failures.
+ */
+static void kunit_run_case_catch_errors(struct kunit_suite *suite,
+					struct kunit_case *test_case)
+{
+	struct kunit_try_catch_context context;
+	struct kunit_try_catch *try_catch;
+	struct kunit test;
+
+	kunit_init_test(&test, test_case->name);
+	try_catch = &test.try_catch;
 
-	kunit_cleanup(&test);
+	kunit_try_catch_init(try_catch,
+			     &test,
+			     kunit_try_run_case,
+			     kunit_catch_run_case);
+	context.test = &test;
+	context.suite = suite;
+	context.test_case = test_case;
+	kunit_try_catch_run(try_catch, &context);
 
 	test_case->success = test.success;
 }
@@ -226,7 +375,7 @@ int kunit_run_tests(struct kunit_suite *suite)
 	kunit_print_subtest_start(suite);
 
 	for (test_case = suite->test_cases; test_case->run_case; test_case++) {
-		kunit_run_case(suite, test_case);
+		kunit_run_case_catch_errors(suite, test_case);
 		kunit_print_test_case_ok_not_ok(test_case, test_case_count++);
 	}
 
diff --git a/kunit/try-catch.c b/kunit/try-catch.c
new file mode 100644
index 0000000000000..de580f074387b
--- /dev/null
+++ b/kunit/try-catch.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * An API to allow a function, that may fail, to be executed, and recover in a
+ * controlled manner.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+
+#include <kunit/try-catch.h>
+#include <kunit/test.h>
+#include <linux/completion.h>
+#include <linux/kthread.h>
+
+void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
+{
+	try_catch->try_result = -EFAULT;
+	complete_and_exit(try_catch->try_completion, -EFAULT);
+}
+
+static int kunit_generic_run_threadfn_adapter(void *data)
+{
+	struct kunit_try_catch *try_catch = data;
+
+	try_catch->try(try_catch->context);
+
+	complete_and_exit(try_catch->try_completion, 0);
+}
+
+void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
+{
+	DECLARE_COMPLETION_ONSTACK(try_completion);
+	struct kunit *test = try_catch->test;
+	struct task_struct *task_struct;
+	int exit_code, status;
+
+	try_catch->context = context;
+	try_catch->try_completion = &try_completion;
+	try_catch->try_result = 0;
+	task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
+				  try_catch,
+				  "kunit_try_catch_thread");
+	if (IS_ERR(task_struct)) {
+		try_catch->catch(try_catch->context);
+		return;
+	}
+
+	/*
+	 * TODO(brendanhiggins@google.com): We should probably have some type of
+	 * variable timeout here. The only question is what that timeout value
+	 * should be.
+	 *
+	 * The intention has always been, at some point, to be able to label
+	 * tests with some type of size bucket (unit/small, integration/medium,
+	 * large/system/end-to-end, etc), where each size bucket would get a
+	 * default timeout value kind of like what Bazel does:
+	 * https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
+	 * There is still some debate to be had on exactly how we do this. (For
+	 * one, we probably want to have some sort of test runner level
+	 * timeout.)
+	 *
+	 * For more background on this topic, see:
+	 * https://mike-bland.com/2011/11/01/small-medium-large.html
+	 */
+	status = wait_for_completion_timeout(&try_completion,
+					     300 * MSEC_PER_SEC); /* 5 min */
+	if (status < 0) {
+		kunit_err(test, "try timed out\n");
+		try_catch->try_result = -ETIMEDOUT;
+	}
+
+	exit_code = try_catch->try_result;
+
+	if (!exit_code)
+		return;
+
+	if (exit_code == -EFAULT)
+		try_catch->try_result = 0;
+	else if (exit_code == -EINTR)
+		kunit_err(test, "wake_up_process() was never called\n");
+	else if (exit_code)
+		kunit_err(test, "Unknown error: %d\n", exit_code);
+
+	try_catch->catch(try_catch->context);
+}
+
+void kunit_try_catch_init(struct kunit_try_catch *try_catch,
+			  struct kunit *test,
+			  kunit_try_catch_func_t try,
+			  kunit_try_catch_func_t catch)
+{
+	try_catch->test = test;
+	try_catch->try = try;
+	try_catch->catch = catch;
+}
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 09/18] kunit: test: add support for test abort

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:12)
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 2625bcfeb19ac..93381f841e09f 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
> @@ -13,6 +13,7 @@
>  #include <linux/types.h>
>  #include <linux/slab.h>
>  #include <kunit/assert.h>
> +#include <kunit/try-catch.h>
>  
>  struct kunit_resource;
>  
> @@ -167,6 +168,7 @@ struct kunit {
>  
>         /* private: internal use only. */
>         const char *name; /* Read only after initialization! */
> +       struct kunit_try_catch try_catch;
>         /*
>          * success starts as true, and may only be set to false during a test
>          * case; thus, it is safe to update this across multiple threads using
> @@ -176,6 +178,11 @@ struct kunit {
>          */
>         bool success; /* Read only after test_case finishes! */
>         spinlock_t lock; /* Gaurds all mutable test state. */
> +       /*
> +        * death_test may be both set and unset from multiple threads in a test
> +        * case.
> +        */
> +       bool death_test; /* Protected by lock. */
>         /*
>          * Because resources is a list that may be updated multiple times (with
>          * new resources) from any thread associated with a test case, we must
> @@ -184,6 +191,13 @@ struct kunit {
>         struct list_head resources; /* Protected by lock. */
>  };
>  
> +static inline void kunit_set_death_test(struct kunit *test, bool death_test)
> +{
> +       spin_lock(&test->lock);
> +       test->death_test = death_test;
> +       spin_unlock(&test->lock);
> +}

These getters and setters are using spinlocks again. It doesn't make any
sense. It probably needs a rework like was done for the other bool
member, success.

> +
>  void kunit_init_test(struct kunit *test, const char *name);
>  
>  int kunit_run_tests(struct kunit_suite *suite);
> diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h
> new file mode 100644
> index 0000000000000..8a414a9af0b64
> --- /dev/null
> +++ b/include/kunit/try-catch.h
> @@ -0,0 +1,69 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * An API to allow a function, that may fail, to be executed, and recover in a
> + * controlled manner.
> + *
> + * Copyright (C) 2019, Google LLC.
> + * Author: Brendan Higgins <brendanhiggins@google.com>
> + */
> +
> +#ifndef _KUNIT_TRY_CATCH_H
> +#define _KUNIT_TRY_CATCH_H
> +
> +#include <linux/types.h>
> +
> +typedef void (*kunit_try_catch_func_t)(void *);
> +
> +struct kunit;

Forward declare struct completion?

> +
> +/*
> + * struct kunit_try_catch - provides a generic way to run code which might fail.
> + * @context: used to pass user data to the try and catch functions.
> + *
> + * kunit_try_catch provides a generic, architecture independent way to execute
> + * an arbitrary function of type kunit_try_catch_func_t which may bail out by
> + * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
> + * is stopped at the site of invocation and @catch is catch is called.
> + *
> + * struct kunit_try_catch provides a generic interface for the functionality
> + * needed to implement kunit->abort() which in turn is needed for implementing
> + * assertions. Assertions allow stating a precondition for a test simplifying
> + * how test cases are written and presented.
> + *
> + * Assertions are like expectations, except they abort (call
> + * kunit_try_catch_throw()) when the specified condition is not met. This is
> + * useful when you look at a test case as a logical statement about some piece
> + * of code, where assertions are the premises for the test case, and the
> + * conclusion is a set of predicates, rather expectations, that must all be
> + * true. If your premises are violated, it does not makes sense to continue.
> + */
> +struct kunit_try_catch {
> +       /* private: internal use only. */
> +       struct kunit *test;
> +       struct completion *try_completion;
> +       int try_result;
> +       kunit_try_catch_func_t try;
> +       kunit_try_catch_func_t catch;

Can these other variables be documented in the kernel doc? And should
context be marked as 'public'?

> +       void *context;
> +};
> +
> +void kunit_try_catch_init(struct kunit_try_catch *try_catch,
> +                         struct kunit *test,
> +                         kunit_try_catch_func_t try,
> +                         kunit_try_catch_func_t catch);
> +
> +void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context);
> +
> +void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch);
> +
> +static inline int kunit_try_catch_get_result(struct kunit_try_catch *try_catch)
> +{
> +       return try_catch->try_result;
> +}
> +
> +/*
> + * Exposed for testing only.

Ugh that's sad. I hope we don't expose more functions just for testing
in other cases.

> + */
> +void kunit_generic_try_catch_init(struct kunit_try_catch *try_catch);
> +
> +#endif /* _KUNIT_TRY_CATCH_H */
> diff --git a/kunit/test.c b/kunit/test.c
> index e5080a2c6b29c..995cb53fe4ee9 100644
> --- a/kunit/test.c
> +++ b/kunit/test.c
> @@ -7,13 +7,26 @@
>   */
>  
>  #include <linux/kernel.h>
> +#include <linux/sched/debug.h>
>  #include <kunit/test.h>
> +#include <kunit/try-catch.h>
>  
>  static void kunit_set_failure(struct kunit *test)
>  {
>         WRITE_ONCE(test->success, false);
>  }
>  
> +static bool kunit_get_death_test(struct kunit *test)
> +{
> +       bool death_test;
> +
> +       spin_lock(&test->lock);
> +       death_test = test->death_test;
> +       spin_unlock(&test->lock);
> +
> +       return death_test;
> +}
> +
>  static int kunit_vprintk_emit(int level, const char *fmt, va_list args)
>  {
>         return vprintk_emit(0, level, NULL, 0, fmt, args);
> @@ -158,6 +171,21 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
>         kunit_print_string_stream(test, stream);
>  }
>  
> +void __noreturn kunit_abort(struct kunit *test)
> +{
> +       kunit_set_death_test(test, true);
> +
> +       kunit_try_catch_throw(&test->try_catch);
> +
> +       /*
> +        * Throw could not abort from test.
> +        *
> +        * XXX: we should never reach this line! As kunit_try_catch_throw is
> +        * marked __noreturn.
> +        */
> +       WARN_ONCE(true, "Throw could not abort from test!\n");

Should this just be a BUG_ON? It's supposedly impossible.

> +}
> +
>  void kunit_do_assertion(struct kunit *test,
>                         struct kunit_assert *assert,
>                         bool pass,
> @@ -176,6 +204,9 @@ void kunit_do_assertion(struct kunit *test,
>         kunit_fail(test, assert);
>  
>         va_end(args);
> +
> +       if (assert->type == KUNIT_ASSERTION)
> +               kunit_abort(test);
>  }
>  
>  void kunit_init_test(struct kunit *test, const char *name)
> @@ -184,36 +215,154 @@ void kunit_init_test(struct kunit *test, const char *name)
>         INIT_LIST_HEAD(&test->resources);
>         test->name = name;
>         test->success = true;
> +       test->death_test = false;
>  }
>  
>  /*
> - * Performs all logic to run a test case.
> + * Initializes and runs test case. Does not clean up or do post validations.
>   */
> -static void kunit_run_case(struct kunit_suite *suite,
> -                          struct kunit_case *test_case)
> +static void kunit_run_case_internal(struct kunit *test,
> +                                   struct kunit_suite *suite,
> +                                   struct kunit_case *test_case)
>  {
> -       struct kunit test;
> -
> -       kunit_init_test(&test, test_case->name);
> -
>         if (suite->init) {
>                 int ret;
>  
> -               ret = suite->init(&test);
> +               ret = suite->init(test);
>                 if (ret) {
> -                       kunit_err(&test, "failed to initialize: %d\n", ret);
> -                       kunit_set_failure(&test);
> -                       test_case->success = test.success;
> +                       kunit_err(test, "failed to initialize: %d\n", ret);
> +                       kunit_set_failure(test);
>                         return;
>                 }
>         }
>  
> -       test_case->run_case(&test);
> +       test_case->run_case(test);
> +}
> +
> +static void kunit_case_internal_cleanup(struct kunit *test)
> +{
> +       kunit_cleanup(test);
> +}
>  
> +/*
> + * Performs post validations and cleanup after a test case was run.
> + * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
> + */
> +static void kunit_run_case_cleanup(struct kunit *test,
> +                                  struct kunit_suite *suite)
> +{
>         if (suite->exit)
> -               suite->exit(&test);
> +               suite->exit(test);
> +
> +       kunit_case_internal_cleanup(test);
> +}
> +
> +/*
> + * Handles an unexpected crash in a test case.
> + */
> +static void kunit_handle_test_crash(struct kunit *test,
> +                                  struct kunit_suite *suite,
> +                                  struct kunit_case *test_case)
> +{
> +       kunit_err(test, "kunit test case crashed!");

Does this need a newline?

> +       /*
> +        * TODO(brendanhiggins@google.com): This prints the stack trace up
> +        * through this frame, not up to the frame that caused the crash.
> +        */
> +       show_stack(NULL, NULL);
> +
> +       kunit_case_internal_cleanup(test);
> +}
> +
> +struct kunit_try_catch_context {
> +       struct kunit *test;
> +       struct kunit_suite *suite;
> +       struct kunit_case *test_case;
> +};
> +
> +static void kunit_try_run_case(void *data)
> +{
> +       struct kunit_try_catch_context *ctx = data;
> +       struct kunit *test = ctx->test;
> +       struct kunit_suite *suite = ctx->suite;
> +       struct kunit_case *test_case = ctx->test_case;
> +
> +       /*
> +        * kunit_run_case_internal may encounter a fatal error; if it does,
> +        * abort will be called, this thread will exit, and finally the parent
> +        * thread will resume control and handle any necessary clean up.
> +        */
> +       kunit_run_case_internal(test, suite, test_case);
> +       /* This line may never be reached. */
> +       kunit_run_case_cleanup(test, suite);
> +}
> +
> +static void kunit_catch_run_case(void *data)
> +{
> +       struct kunit_try_catch_context *ctx = data;
> +       struct kunit *test = ctx->test;
> +       struct kunit_suite *suite = ctx->suite;
> +       struct kunit_case *test_case = ctx->test_case;
> +       int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
> +
> +       if (try_exit_code) {
> +               kunit_set_failure(test);
> +               /*
> +                * Test case could not finish, we have no idea what state it is
> +                * in, so don't do clean up.
> +                */
> +               if (try_exit_code == -ETIMEDOUT)
> +                       kunit_err(test, "test case timed out\n");
> +               /*
> +                * Unknown internal error occurred preventing test case from
> +                * running, so there is nothing to clean up.
> +                */
> +               else
> +                       kunit_err(test, "internal error occurred preventing test case from running: %d\n",
> +                                 try_exit_code);

Nitpick: I would add braces here because you make the if statement into
multi-line arms for each case.

> +               return;
> +       }
> +
> +       if (kunit_get_death_test(test)) {
> +               /*
> +                * EXPECTED DEATH: kunit_run_case_internal encountered
> +                * anticipated fatal error. Everything should be in a safe
> +                * state.
> +                */
> +               kunit_run_case_cleanup(test, suite);
> +       } else {
> +               /*
> +                * UNEXPECTED DEATH: kunit_run_case_internal encountered an
> +                * unanticipated fatal error. We have no idea what the state of
> +                * the test case is in.
> +                */
> +               kunit_handle_test_crash(test, suite, test_case);
> +               kunit_set_failure(test);

Like was done here.

> +       }
> +}
> +
> +/*
> + * Performs all logic to run a test case. It also catches most errors that
> + * occurs in a test case and reports them as failures.

s/occurs/occur/

> + */
> +static void kunit_run_case_catch_errors(struct kunit_suite *suite,
[...]
> diff --git a/kunit/try-catch.c b/kunit/try-catch.c
> new file mode 100644
> index 0000000000000..de580f074387b
> --- /dev/null
> +++ b/kunit/try-catch.c
> @@ -0,0 +1,95 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * An API to allow a function, that may fail, to be executed, and recover in a
> + * controlled manner.
> + *
> + * Copyright (C) 2019, Google LLC.
> + * Author: Brendan Higgins <brendanhiggins@google.com>
> + */
> +
> +#include <kunit/try-catch.h>
> +#include <kunit/test.h>
> +#include <linux/completion.h>
> +#include <linux/kthread.h>
> +
> +void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
> +{
> +       try_catch->try_result = -EFAULT;
> +       complete_and_exit(try_catch->try_completion, -EFAULT);
> +}
> +
> +static int kunit_generic_run_threadfn_adapter(void *data)
> +{
> +       struct kunit_try_catch *try_catch = data;
> +
> +       try_catch->try(try_catch->context);
> +
> +       complete_and_exit(try_catch->try_completion, 0);
> +}
> +
> +void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
> +{
> +       DECLARE_COMPLETION_ONSTACK(try_completion);
> +       struct kunit *test = try_catch->test;
> +       struct task_struct *task_struct;
> +       int exit_code, status;
> +
> +       try_catch->context = context;
> +       try_catch->try_completion = &try_completion;
> +       try_catch->try_result = 0;
> +       task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
> +                                 try_catch,
> +                                 "kunit_try_catch_thread");
> +       if (IS_ERR(task_struct)) {
> +               try_catch->catch(try_catch->context);
> +               return;
> +       }
> +
> +       /*
> +        * TODO(brendanhiggins@google.com): We should probably have some type of
> +        * variable timeout here. The only question is what that timeout value
> +        * should be.
> +        *
> +        * The intention has always been, at some point, to be able to label
> +        * tests with some type of size bucket (unit/small, integration/medium,
> +        * large/system/end-to-end, etc), where each size bucket would get a
> +        * default timeout value kind of like what Bazel does:
> +        * https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
> +        * There is still some debate to be had on exactly how we do this. (For
> +        * one, we probably want to have some sort of test runner level
> +        * timeout.)
> +        *
> +        * For more background on this topic, see:
> +        * https://mike-bland.com/2011/11/01/small-medium-large.html
> +        */
> +       status = wait_for_completion_timeout(&try_completion,
> +                                            300 * MSEC_PER_SEC); /* 5 min */
> +       if (status < 0) {

wait_for_completion_timeout() doesn't return a negative value on
timeout. It returns 0. Please rename 'status' to 'time_remaining' and
test with if (!time_remaining) instead or some other suitably named
variable name indicating that the return value is the time remaining
before the timeout.

May also want to clamp this to the hung task timeout value, which is
typically less than 5 minutes. Otherwise, the hung task detector may
find the problem first before this timeout happens.

> +               kunit_err(test, "try timed out\n");
> +               try_catch->try_result = -ETIMEDOUT;
> +       }

Re: [PATCH v12 09/18] kunit: test: add support for test abort

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:22 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:12)
> > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > index 2625bcfeb19ac..93381f841e09f 100644
> > --- a/include/kunit/test.h
> > +++ b/include/kunit/test.h
> > @@ -13,6 +13,7 @@
> >  #include <linux/types.h>
> >  #include <linux/slab.h>
> >  #include <kunit/assert.h>
> > +#include <kunit/try-catch.h>
> >
> >  struct kunit_resource;
> >
> > @@ -167,6 +168,7 @@ struct kunit {
> >
> >         /* private: internal use only. */
> >         const char *name; /* Read only after initialization! */
> > +       struct kunit_try_catch try_catch;
> >         /*
> >          * success starts as true, and may only be set to false during a test
> >          * case; thus, it is safe to update this across multiple threads using
> > @@ -176,6 +178,11 @@ struct kunit {
> >          */
> >         bool success; /* Read only after test_case finishes! */
> >         spinlock_t lock; /* Gaurds all mutable test state. */
> > +       /*
> > +        * death_test may be both set and unset from multiple threads in a test
> > +        * case.
> > +        */
> > +       bool death_test; /* Protected by lock. */
> >         /*
> >          * Because resources is a list that may be updated multiple times (with
> >          * new resources) from any thread associated with a test case, we must
> > @@ -184,6 +191,13 @@ struct kunit {
> >         struct list_head resources; /* Protected by lock. */
> >  };
> >
> > +static inline void kunit_set_death_test(struct kunit *test, bool death_test)
> > +{
> > +       spin_lock(&test->lock);
> > +       test->death_test = death_test;
> > +       spin_unlock(&test->lock);
> > +}
>
> These getters and setters are using spinlocks again. It doesn't make any
> sense. It probably needs a rework like was done for the other bool
> member, success.

No, this is intentional. death_test can transition from false to true
and then back to false within the same test. Maybe that deserves a
comment?

> > +
> >  void kunit_init_test(struct kunit *test, const char *name);
> >
> >  int kunit_run_tests(struct kunit_suite *suite);
> > diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h
> > new file mode 100644
> > index 0000000000000..8a414a9af0b64
> > --- /dev/null
> > +++ b/include/kunit/try-catch.h
> > @@ -0,0 +1,69 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * An API to allow a function, that may fail, to be executed, and recover in a
> > + * controlled manner.
> > + *
> > + * Copyright (C) 2019, Google LLC.
> > + * Author: Brendan Higgins <brendanhiggins@google.com>
> > + */
> > +
> > +#ifndef _KUNIT_TRY_CATCH_H
> > +#define _KUNIT_TRY_CATCH_H
> > +
> > +#include <linux/types.h>
> > +
> > +typedef void (*kunit_try_catch_func_t)(void *);
> > +
> > +struct kunit;
>
> Forward declare struct completion?

Sure. Will do.

> > +
> > +/*
> > + * struct kunit_try_catch - provides a generic way to run code which might fail.
> > + * @context: used to pass user data to the try and catch functions.
> > + *
> > + * kunit_try_catch provides a generic, architecture independent way to execute
> > + * an arbitrary function of type kunit_try_catch_func_t which may bail out by
> > + * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
> > + * is stopped at the site of invocation and @catch is catch is called.
> > + *
> > + * struct kunit_try_catch provides a generic interface for the functionality
> > + * needed to implement kunit->abort() which in turn is needed for implementing
> > + * assertions. Assertions allow stating a precondition for a test simplifying
> > + * how test cases are written and presented.
> > + *
> > + * Assertions are like expectations, except they abort (call
> > + * kunit_try_catch_throw()) when the specified condition is not met. This is
> > + * useful when you look at a test case as a logical statement about some piece
> > + * of code, where assertions are the premises for the test case, and the
> > + * conclusion is a set of predicates, rather expectations, that must all be
> > + * true. If your premises are violated, it does not makes sense to continue.
> > + */
> > +struct kunit_try_catch {
> > +       /* private: internal use only. */
> > +       struct kunit *test;
> > +       struct completion *try_completion;
> > +       int try_result;
> > +       kunit_try_catch_func_t try;
> > +       kunit_try_catch_func_t catch;
>
> Can these other variables be documented in the kernel doc? And should
> context be marked as 'public'?

Sure, I can document them.

But I don't think context should be public; it should only be accessed
by kunit_try_catch_* functions. context should only be populated by
*_init, and will be passed into *try and *catch when they are called
internally.

> > +       void *context;
> > +};
> > +
> > +void kunit_try_catch_init(struct kunit_try_catch *try_catch,
> > +                         struct kunit *test,
> > +                         kunit_try_catch_func_t try,
> > +                         kunit_try_catch_func_t catch);
> > +
> > +void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context);
> > +
> > +void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch);
> > +
> > +static inline int kunit_try_catch_get_result(struct kunit_try_catch *try_catch)
> > +{
> > +       return try_catch->try_result;
> > +}
> > +
> > +/*
> > + * Exposed for testing only.
>
> Ugh that's sad. I hope we don't expose more functions just for testing
> in other cases.

I don't think I am in any other cases in this patchset. I agree that
it is generally bad to expose a private function for testing purposes,
but I didn't see a better way here.

> > + */
> > +void kunit_generic_try_catch_init(struct kunit_try_catch *try_catch);
> > +
> > +#endif /* _KUNIT_TRY_CATCH_H */
> > diff --git a/kunit/test.c b/kunit/test.c
> > index e5080a2c6b29c..995cb53fe4ee9 100644
> > --- a/kunit/test.c
> > +++ b/kunit/test.c
> > @@ -7,13 +7,26 @@
> >   */
> >
> >  #include <linux/kernel.h>
> > +#include <linux/sched/debug.h>
> >  #include <kunit/test.h>
> > +#include <kunit/try-catch.h>
> >
> >  static void kunit_set_failure(struct kunit *test)
> >  {
> >         WRITE_ONCE(test->success, false);
> >  }
> >
> > +static bool kunit_get_death_test(struct kunit *test)
> > +{
> > +       bool death_test;
> > +
> > +       spin_lock(&test->lock);
> > +       death_test = test->death_test;
> > +       spin_unlock(&test->lock);
> > +
> > +       return death_test;
> > +}
> > +
> >  static int kunit_vprintk_emit(int level, const char *fmt, va_list args)
> >  {
> >         return vprintk_emit(0, level, NULL, 0, fmt, args);
> > @@ -158,6 +171,21 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
> >         kunit_print_string_stream(test, stream);
> >  }
> >
> > +void __noreturn kunit_abort(struct kunit *test)
> > +{
> > +       kunit_set_death_test(test, true);
> > +
> > +       kunit_try_catch_throw(&test->try_catch);
> > +
> > +       /*
> > +        * Throw could not abort from test.
> > +        *
> > +        * XXX: we should never reach this line! As kunit_try_catch_throw is
> > +        * marked __noreturn.
> > +        */
> > +       WARN_ONCE(true, "Throw could not abort from test!\n");
>
> Should this just be a BUG_ON? It's supposedly impossible.

It should be impossible; it will only reach this line if there is a
bug in kunit_try_catch_throw. The reason I didn't use BUG_ON was
because I previously got yelled at for having BUG_ON in this code
path.

Nevertheless, I think BUG_ON is more correct, so if you will stand by
it, then that's what I will do.

> > +}
> > +
> >  void kunit_do_assertion(struct kunit *test,
> >                         struct kunit_assert *assert,
> >                         bool pass,
> > @@ -176,6 +204,9 @@ void kunit_do_assertion(struct kunit *test,
> >         kunit_fail(test, assert);
> >
> >         va_end(args);
> > +
> > +       if (assert->type == KUNIT_ASSERTION)
> > +               kunit_abort(test);
> >  }
> >
> >  void kunit_init_test(struct kunit *test, const char *name)
> > @@ -184,36 +215,154 @@ void kunit_init_test(struct kunit *test, const char *name)
> >         INIT_LIST_HEAD(&test->resources);
> >         test->name = name;
> >         test->success = true;
> > +       test->death_test = false;
> >  }
> >
> >  /*
> > - * Performs all logic to run a test case.
> > + * Initializes and runs test case. Does not clean up or do post validations.
> >   */
> > -static void kunit_run_case(struct kunit_suite *suite,
> > -                          struct kunit_case *test_case)
> > +static void kunit_run_case_internal(struct kunit *test,
> > +                                   struct kunit_suite *suite,
> > +                                   struct kunit_case *test_case)
> >  {
> > -       struct kunit test;
> > -
> > -       kunit_init_test(&test, test_case->name);
> > -
> >         if (suite->init) {
> >                 int ret;
> >
> > -               ret = suite->init(&test);
> > +               ret = suite->init(test);
> >                 if (ret) {
> > -                       kunit_err(&test, "failed to initialize: %d\n", ret);
> > -                       kunit_set_failure(&test);
> > -                       test_case->success = test.success;
> > +                       kunit_err(test, "failed to initialize: %d\n", ret);
> > +                       kunit_set_failure(test);
> >                         return;
> >                 }
> >         }
> >
> > -       test_case->run_case(&test);
> > +       test_case->run_case(test);
> > +}
> > +
> > +static void kunit_case_internal_cleanup(struct kunit *test)
> > +{
> > +       kunit_cleanup(test);
> > +}
> >
> > +/*
> > + * Performs post validations and cleanup after a test case was run.
> > + * XXX: Should ONLY BE CALLED AFTER kunit_run_case_internal!
> > + */
> > +static void kunit_run_case_cleanup(struct kunit *test,
> > +                                  struct kunit_suite *suite)
> > +{
> >         if (suite->exit)
> > -               suite->exit(&test);
> > +               suite->exit(test);
> > +
> > +       kunit_case_internal_cleanup(test);
> > +}
> > +
> > +/*
> > + * Handles an unexpected crash in a test case.
> > + */
> > +static void kunit_handle_test_crash(struct kunit *test,
> > +                                  struct kunit_suite *suite,
> > +                                  struct kunit_case *test_case)
> > +{
> > +       kunit_err(test, "kunit test case crashed!");
>
> Does this need a newline?

Yep, nice catch. I thought I grepped for all the instance a while ago,
but I apparently missed this one.

> > +       /*
> > +        * TODO(brendanhiggins@google.com): This prints the stack trace up
> > +        * through this frame, not up to the frame that caused the crash.
> > +        */
> > +       show_stack(NULL, NULL);
> > +
> > +       kunit_case_internal_cleanup(test);
> > +}
> > +
> > +struct kunit_try_catch_context {
> > +       struct kunit *test;
> > +       struct kunit_suite *suite;
> > +       struct kunit_case *test_case;
> > +};
> > +
> > +static void kunit_try_run_case(void *data)
> > +{
> > +       struct kunit_try_catch_context *ctx = data;
> > +       struct kunit *test = ctx->test;
> > +       struct kunit_suite *suite = ctx->suite;
> > +       struct kunit_case *test_case = ctx->test_case;
> > +
> > +       /*
> > +        * kunit_run_case_internal may encounter a fatal error; if it does,
> > +        * abort will be called, this thread will exit, and finally the parent
> > +        * thread will resume control and handle any necessary clean up.
> > +        */
> > +       kunit_run_case_internal(test, suite, test_case);
> > +       /* This line may never be reached. */
> > +       kunit_run_case_cleanup(test, suite);
> > +}
> > +
> > +static void kunit_catch_run_case(void *data)
> > +{
> > +       struct kunit_try_catch_context *ctx = data;
> > +       struct kunit *test = ctx->test;
> > +       struct kunit_suite *suite = ctx->suite;
> > +       struct kunit_case *test_case = ctx->test_case;
> > +       int try_exit_code = kunit_try_catch_get_result(&test->try_catch);
> > +
> > +       if (try_exit_code) {
> > +               kunit_set_failure(test);
> > +               /*
> > +                * Test case could not finish, we have no idea what state it is
> > +                * in, so don't do clean up.
> > +                */
> > +               if (try_exit_code == -ETIMEDOUT)
> > +                       kunit_err(test, "test case timed out\n");
> > +               /*
> > +                * Unknown internal error occurred preventing test case from
> > +                * running, so there is nothing to clean up.
> > +                */
> > +               else
> > +                       kunit_err(test, "internal error occurred preventing test case from running: %d\n",
> > +                                 try_exit_code);
>
> Nitpick: I would add braces here because you make the if statement into
> multi-line arms for each case.

Will do. I think it looks better with braces anyway.

> > +               return;
> > +       }
> > +
> > +       if (kunit_get_death_test(test)) {
> > +               /*
> > +                * EXPECTED DEATH: kunit_run_case_internal encountered
> > +                * anticipated fatal error. Everything should be in a safe
> > +                * state.
> > +                */
> > +               kunit_run_case_cleanup(test, suite);
> > +       } else {
> > +               /*
> > +                * UNEXPECTED DEATH: kunit_run_case_internal encountered an
> > +                * unanticipated fatal error. We have no idea what the state of
> > +                * the test case is in.
> > +                */
> > +               kunit_handle_test_crash(test, suite, test_case);
> > +               kunit_set_failure(test);
>
> Like was done here.

Sorry, like what?

> > +       }
> > +}
> > +
> > +/*
> > + * Performs all logic to run a test case. It also catches most errors that
> > + * occurs in a test case and reports them as failures.
>
> s/occurs/occur/

Damn, I should go over all these with spell check. Will fix, thanks!

> > + */
> > +static void kunit_run_case_catch_errors(struct kunit_suite *suite,
> [...]
> > diff --git a/kunit/try-catch.c b/kunit/try-catch.c
> > new file mode 100644
> > index 0000000000000..de580f074387b
> > --- /dev/null
> > +++ b/kunit/try-catch.c
> > @@ -0,0 +1,95 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * An API to allow a function, that may fail, to be executed, and recover in a
> > + * controlled manner.
> > + *
> > + * Copyright (C) 2019, Google LLC.
> > + * Author: Brendan Higgins <brendanhiggins@google.com>
> > + */
> > +
> > +#include <kunit/try-catch.h>
> > +#include <kunit/test.h>
> > +#include <linux/completion.h>
> > +#include <linux/kthread.h>
> > +
> > +void __noreturn kunit_try_catch_throw(struct kunit_try_catch *try_catch)
> > +{
> > +       try_catch->try_result = -EFAULT;
> > +       complete_and_exit(try_catch->try_completion, -EFAULT);
> > +}
> > +
> > +static int kunit_generic_run_threadfn_adapter(void *data)
> > +{
> > +       struct kunit_try_catch *try_catch = data;
> > +
> > +       try_catch->try(try_catch->context);
> > +
> > +       complete_and_exit(try_catch->try_completion, 0);
> > +}
> > +
> > +void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
> > +{
> > +       DECLARE_COMPLETION_ONSTACK(try_completion);
> > +       struct kunit *test = try_catch->test;
> > +       struct task_struct *task_struct;
> > +       int exit_code, status;
> > +
> > +       try_catch->context = context;
> > +       try_catch->try_completion = &try_completion;
> > +       try_catch->try_result = 0;
> > +       task_struct = kthread_run(kunit_generic_run_threadfn_adapter,
> > +                                 try_catch,
> > +                                 "kunit_try_catch_thread");
> > +       if (IS_ERR(task_struct)) {
> > +               try_catch->catch(try_catch->context);
> > +               return;
> > +       }
> > +
> > +       /*
> > +        * TODO(brendanhiggins@google.com): We should probably have some type of
> > +        * variable timeout here. The only question is what that timeout value
> > +        * should be.
> > +        *
> > +        * The intention has always been, at some point, to be able to label
> > +        * tests with some type of size bucket (unit/small, integration/medium,
> > +        * large/system/end-to-end, etc), where each size bucket would get a
> > +        * default timeout value kind of like what Bazel does:
> > +        * https://docs.bazel.build/versions/master/be/common-definitions.html#test.size
> > +        * There is still some debate to be had on exactly how we do this. (For
> > +        * one, we probably want to have some sort of test runner level
> > +        * timeout.)
> > +        *
> > +        * For more background on this topic, see:
> > +        * https://mike-bland.com/2011/11/01/small-medium-large.html
> > +        */
> > +       status = wait_for_completion_timeout(&try_completion,
> > +                                            300 * MSEC_PER_SEC); /* 5 min */
> > +       if (status < 0) {
>
> wait_for_completion_timeout() doesn't return a negative value on
> timeout. It returns 0. Please rename 'status' to 'time_remaining' and
> test with if (!time_remaining) instead or some other suitably named
> variable name indicating that the return value is the time remaining
> before the timeout.

Crap, I knew that. Sorry, I wasn't thinking.

> May also want to clamp this to the hung task timeout value, which is
> typically less than 5 minutes. Otherwise, the hung task detector may
> find the problem first before this timeout happens.

Makes sense. Will fix.

> > +               kunit_err(test, "try timed out\n");
> > +               try_catch->try_result = -ETIMEDOUT;
> > +       }

Re: [PATCH v12 09/18] kunit: test: add support for test abort

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 21:57:55)
> On Mon, Aug 12, 2019 at 9:22 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 11:24:12)
> > > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > > index 2625bcfeb19ac..93381f841e09f 100644
> > > --- a/include/kunit/test.h
> > > +++ b/include/kunit/test.h
> > > @@ -176,6 +178,11 @@ struct kunit {
> > >          */
> > >         bool success; /* Read only after test_case finishes! */
> > >         spinlock_t lock; /* Gaurds all mutable test state. */
> > > +       /*
> > > +        * death_test may be both set and unset from multiple threads in a test
> > > +        * case.
> > > +        */
> > > +       bool death_test; /* Protected by lock. */
> > >         /*
> > >          * Because resources is a list that may be updated multiple times (with
> > >          * new resources) from any thread associated with a test case, we must
> > > @@ -184,6 +191,13 @@ struct kunit {
> > >         struct list_head resources; /* Protected by lock. */
> > >  };
> > >
> > > +static inline void kunit_set_death_test(struct kunit *test, bool death_test)
> > > +{
> > > +       spin_lock(&test->lock);
> > > +       test->death_test = death_test;
> > > +       spin_unlock(&test->lock);
> > > +}
> >
> > These getters and setters are using spinlocks again. It doesn't make any
> > sense. It probably needs a rework like was done for the other bool
> > member, success.
> 
> No, this is intentional. death_test can transition from false to true
> and then back to false within the same test. Maybe that deserves a
> comment?

Yes. How does it transition from true to false again?

Either way, having a spinlock around a read/write API doesn't make sense
because it just makes sure that two writes don't overlap, but otherwise
does nothing to keep things synchronized. For example a set to true
after a set to false when the two calls to set true or false aren't
synchronized means they can happen in any order. So I don't see how it
needs a spinlock. The lock needs to be one level higher.

> 
> > > +
> > >  void kunit_init_test(struct kunit *test, const char *name);
> > >
> > >  int kunit_run_tests(struct kunit_suite *suite);
> > > diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h
> > > new file mode 100644
> > > index 0000000000000..8a414a9af0b64
> > > --- /dev/null
> > > +++ b/include/kunit/try-catch.h
[...]
> > > +
> > > +/*
> > > + * struct kunit_try_catch - provides a generic way to run code which might fail.
> > > + * @context: used to pass user data to the try and catch functions.
> > > + *
> > > + * kunit_try_catch provides a generic, architecture independent way to execute
> > > + * an arbitrary function of type kunit_try_catch_func_t which may bail out by
> > > + * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
> > > + * is stopped at the site of invocation and @catch is catch is called.
> > > + *
> > > + * struct kunit_try_catch provides a generic interface for the functionality
> > > + * needed to implement kunit->abort() which in turn is needed for implementing
> > > + * assertions. Assertions allow stating a precondition for a test simplifying
> > > + * how test cases are written and presented.
> > > + *
> > > + * Assertions are like expectations, except they abort (call
> > > + * kunit_try_catch_throw()) when the specified condition is not met. This is
> > > + * useful when you look at a test case as a logical statement about some piece
> > > + * of code, where assertions are the premises for the test case, and the
> > > + * conclusion is a set of predicates, rather expectations, that must all be
> > > + * true. If your premises are violated, it does not makes sense to continue.
> > > + */
> > > +struct kunit_try_catch {
> > > +       /* private: internal use only. */
> > > +       struct kunit *test;
> > > +       struct completion *try_completion;
> > > +       int try_result;
> > > +       kunit_try_catch_func_t try;
> > > +       kunit_try_catch_func_t catch;
> >
> > Can these other variables be documented in the kernel doc? And should
> > context be marked as 'public'?
> 
> Sure, I can document them.
> 
> But I don't think context should be public; it should only be accessed
> by kunit_try_catch_* functions. context should only be populated by
> *_init, and will be passed into *try and *catch when they are called
> internally.

Ok. Then I guess just document them all but keep them all marked as
private.

> 
> > > + */
> > > +void kunit_generic_try_catch_init(struct kunit_try_catch *try_catch);
> > > +
> > > +#endif /* _KUNIT_TRY_CATCH_H */
> > > diff --git a/kunit/test.c b/kunit/test.c
> > > index e5080a2c6b29c..995cb53fe4ee9 100644
> > > --- a/kunit/test.c
> > > +++ b/kunit/test.c
> > > @@ -158,6 +171,21 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
> > >         kunit_print_string_stream(test, stream);
> > >  }
> > >
> > > +void __noreturn kunit_abort(struct kunit *test)
> > > +{
> > > +       kunit_set_death_test(test, true);
> > > +
> > > +       kunit_try_catch_throw(&test->try_catch);
> > > +
> > > +       /*
> > > +        * Throw could not abort from test.
> > > +        *
> > > +        * XXX: we should never reach this line! As kunit_try_catch_throw is
> > > +        * marked __noreturn.
> > > +        */
> > > +       WARN_ONCE(true, "Throw could not abort from test!\n");
> >
> > Should this just be a BUG_ON? It's supposedly impossible.
> 
> It should be impossible; it will only reach this line if there is a
> bug in kunit_try_catch_throw. The reason I didn't use BUG_ON was
> because I previously got yelled at for having BUG_ON in this code
> path.
> 
> Nevertheless, I think BUG_ON is more correct, so if you will stand by
> it, then that's what I will do.

Yeah BUG_ON is appropriate here and self documenting so please use it.

> 
> > > +               return;
> > > +       }
> > > +
> > > +       if (kunit_get_death_test(test)) {
> > > +               /*
> > > +                * EXPECTED DEATH: kunit_run_case_internal encountered
> > > +                * anticipated fatal error. Everything should be in a safe
> > > +                * state.
> > > +                */
> > > +               kunit_run_case_cleanup(test, suite);
> > > +       } else {
> > > +               /*
> > > +                * UNEXPECTED DEATH: kunit_run_case_internal encountered an
> > > +                * unanticipated fatal error. We have no idea what the state of
> > > +                * the test case is in.
> > > +                */
> > > +               kunit_handle_test_crash(test, suite, test_case);
> > > +               kunit_set_failure(test);
> >
> > Like was done here.
> 
> Sorry, like what?

Just saying this has braces for the if-else.

Re: [PATCH v12 09/18] kunit: test: add support for test abort

[Brendan Higgins]

On Mon, Aug 12, 2019 at 10:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 21:57:55)
> > On Mon, Aug 12, 2019 at 9:22 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Brendan Higgins (2019-08-12 11:24:12)
> > > > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > > > index 2625bcfeb19ac..93381f841e09f 100644
> > > > --- a/include/kunit/test.h
> > > > +++ b/include/kunit/test.h
> > > > @@ -176,6 +178,11 @@ struct kunit {
> > > >          */
> > > >         bool success; /* Read only after test_case finishes! */
> > > >         spinlock_t lock; /* Gaurds all mutable test state. */
> > > > +       /*
> > > > +        * death_test may be both set and unset from multiple threads in a test
> > > > +        * case.
> > > > +        */
> > > > +       bool death_test; /* Protected by lock. */
> > > >         /*
> > > >          * Because resources is a list that may be updated multiple times (with
> > > >          * new resources) from any thread associated with a test case, we must
> > > > @@ -184,6 +191,13 @@ struct kunit {
> > > >         struct list_head resources; /* Protected by lock. */
> > > >  };
> > > >
> > > > +static inline void kunit_set_death_test(struct kunit *test, bool death_test)
> > > > +{
> > > > +       spin_lock(&test->lock);
> > > > +       test->death_test = death_test;
> > > > +       spin_unlock(&test->lock);
> > > > +}
> > >
> > > These getters and setters are using spinlocks again. It doesn't make any
> > > sense. It probably needs a rework like was done for the other bool
> > > member, success.
> >
> > No, this is intentional. death_test can transition from false to true
> > and then back to false within the same test. Maybe that deserves a
> > comment?
>
> Yes. How does it transition from true to false again?

The purpose is to tell try_catch that it was expected for the test to
bail out. Given the default implementation there is no way for this to
happen aside from abort() being called, but in some implementations it
is possible to implement a fault catcher which allows a test suite to
recover from an unexpected failure.

Maybe it would be best to drop this until I add one of those
alternative implementations.

> Either way, having a spinlock around a read/write API doesn't make sense
> because it just makes sure that two writes don't overlap, but otherwise
> does nothing to keep things synchronized. For example a set to true
> after a set to false when the two calls to set true or false aren't
> synchronized means they can happen in any order. So I don't see how it
> needs a spinlock. The lock needs to be one level higher.

There shouldn't be any cases where one thread is trying to set it
while another is trying to unset it. The thing I am worried about here
is making sure all the cores see the write, and making sure no reads
or writes get reordered before it. So I guess I just want a fence. So
I take it I should probably have is a WRITE_ONCE here and READ_ONCE in
the getter?

> >
> > > > +
> > > >  void kunit_init_test(struct kunit *test, const char *name);
> > > >
> > > >  int kunit_run_tests(struct kunit_suite *suite);
> > > > diff --git a/include/kunit/try-catch.h b/include/kunit/try-catch.h
> > > > new file mode 100644
> > > > index 0000000000000..8a414a9af0b64
> > > > --- /dev/null
> > > > +++ b/include/kunit/try-catch.h
> [...]
> > > > +
> > > > +/*
> > > > + * struct kunit_try_catch - provides a generic way to run code which might fail.
> > > > + * @context: used to pass user data to the try and catch functions.
> > > > + *
> > > > + * kunit_try_catch provides a generic, architecture independent way to execute
> > > > + * an arbitrary function of type kunit_try_catch_func_t which may bail out by
> > > > + * calling kunit_try_catch_throw(). If kunit_try_catch_throw() is called, @try
> > > > + * is stopped at the site of invocation and @catch is catch is called.
> > > > + *
> > > > + * struct kunit_try_catch provides a generic interface for the functionality
> > > > + * needed to implement kunit->abort() which in turn is needed for implementing
> > > > + * assertions. Assertions allow stating a precondition for a test simplifying
> > > > + * how test cases are written and presented.
> > > > + *
> > > > + * Assertions are like expectations, except they abort (call
> > > > + * kunit_try_catch_throw()) when the specified condition is not met. This is
> > > > + * useful when you look at a test case as a logical statement about some piece
> > > > + * of code, where assertions are the premises for the test case, and the
> > > > + * conclusion is a set of predicates, rather expectations, that must all be
> > > > + * true. If your premises are violated, it does not makes sense to continue.
> > > > + */
> > > > +struct kunit_try_catch {
> > > > +       /* private: internal use only. */
> > > > +       struct kunit *test;
> > > > +       struct completion *try_completion;
> > > > +       int try_result;
> > > > +       kunit_try_catch_func_t try;
> > > > +       kunit_try_catch_func_t catch;
> > >
> > > Can these other variables be documented in the kernel doc? And should
> > > context be marked as 'public'?
> >
> > Sure, I can document them.
> >
> > But I don't think context should be public; it should only be accessed
> > by kunit_try_catch_* functions. context should only be populated by
> > *_init, and will be passed into *try and *catch when they are called
> > internally.
>
> Ok. Then I guess just document them all but keep them all marked as
> private.

Will do.

> >
> > > > + */
> > > > +void kunit_generic_try_catch_init(struct kunit_try_catch *try_catch);
> > > > +
> > > > +#endif /* _KUNIT_TRY_CATCH_H */
> > > > diff --git a/kunit/test.c b/kunit/test.c
> > > > index e5080a2c6b29c..995cb53fe4ee9 100644
> > > > --- a/kunit/test.c
> > > > +++ b/kunit/test.c
> > > > @@ -158,6 +171,21 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert)
> > > >         kunit_print_string_stream(test, stream);
> > > >  }
> > > >
> > > > +void __noreturn kunit_abort(struct kunit *test)
> > > > +{
> > > > +       kunit_set_death_test(test, true);
> > > > +
> > > > +       kunit_try_catch_throw(&test->try_catch);
> > > > +
> > > > +       /*
> > > > +        * Throw could not abort from test.
> > > > +        *
> > > > +        * XXX: we should never reach this line! As kunit_try_catch_throw is
> > > > +        * marked __noreturn.
> > > > +        */
> > > > +       WARN_ONCE(true, "Throw could not abort from test!\n");
> > >
> > > Should this just be a BUG_ON? It's supposedly impossible.
> >
> > It should be impossible; it will only reach this line if there is a
> > bug in kunit_try_catch_throw. The reason I didn't use BUG_ON was
> > because I previously got yelled at for having BUG_ON in this code
> > path.
> >
> > Nevertheless, I think BUG_ON is more correct, so if you will stand by
> > it, then that's what I will do.
>
> Yeah BUG_ON is appropriate here and self documenting so please use it.

Cool, will do.

> >
> > > > +               return;
> > > > +       }
> > > > +
> > > > +       if (kunit_get_death_test(test)) {
> > > > +               /*
> > > > +                * EXPECTED DEATH: kunit_run_case_internal encountered
> > > > +                * anticipated fatal error. Everything should be in a safe
> > > > +                * state.
> > > > +                */
> > > > +               kunit_run_case_cleanup(test, suite);
> > > > +       } else {
> > > > +               /*
> > > > +                * UNEXPECTED DEATH: kunit_run_case_internal encountered an
> > > > +                * unanticipated fatal error. We have no idea what the state of
> > > > +                * the test case is in.
> > > > +                */
> > > > +               kunit_handle_test_crash(test, suite, test_case);
> > > > +               kunit_set_failure(test);
> > >
> > > Like was done here.
> >
> > Sorry, like what?
>
> Just saying this has braces for the if-else.

Ah, gotcha.

Re: [PATCH v12 09/18] kunit: test: add support for test abort

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-13 00:52:03)
> On Mon, Aug 12, 2019 at 10:56 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 21:57:55)
> > > On Mon, Aug 12, 2019 at 9:22 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > >
> > > > Quoting Brendan Higgins (2019-08-12 11:24:12)
> > > > > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > > > > index 2625bcfeb19ac..93381f841e09f 100644
> > > > > --- a/include/kunit/test.h
> > > > > +++ b/include/kunit/test.h
> > > > > @@ -184,6 +191,13 @@ struct kunit {
> > > > >         struct list_head resources; /* Protected by lock. */
> > > > >  };
> > > > >
> > > > > +static inline void kunit_set_death_test(struct kunit *test, bool death_test)
> > > > > +{
> > > > > +       spin_lock(&test->lock);
> > > > > +       test->death_test = death_test;
> > > > > +       spin_unlock(&test->lock);
> > > > > +}
> > > >
> > > > These getters and setters are using spinlocks again. It doesn't make any
> > > > sense. It probably needs a rework like was done for the other bool
> > > > member, success.
> > >
> > > No, this is intentional. death_test can transition from false to true
> > > and then back to false within the same test. Maybe that deserves a
> > > comment?
> >
> > Yes. How does it transition from true to false again?
> 
> The purpose is to tell try_catch that it was expected for the test to
> bail out. Given the default implementation there is no way for this to
> happen aside from abort() being called, but in some implementations it
> is possible to implement a fault catcher which allows a test suite to
> recover from an unexpected failure.
> 
> Maybe it would be best to drop this until I add one of those
> alternative implementations.

Ok.

> 
> > Either way, having a spinlock around a read/write API doesn't make sense
> > because it just makes sure that two writes don't overlap, but otherwise
> > does nothing to keep things synchronized. For example a set to true
> > after a set to false when the two calls to set true or false aren't
> > synchronized means they can happen in any order. So I don't see how it
> > needs a spinlock. The lock needs to be one level higher.
> 
> There shouldn't be any cases where one thread is trying to set it
> while another is trying to unset it. The thing I am worried about here
> is making sure all the cores see the write, and making sure no reads
> or writes get reordered before it. So I guess I just want a fence. So
> I take it I should probably have is a WRITE_ONCE here and READ_ONCE in
> the getter?
> 

Are the gets and sets in program order? If so, WRITE_ONCE and READ_ONCE
aren't required. Otherwise, if it's possible for one thread to write it
and another to read it but the threads are ordered with some other
barrier like a completion or lock, then again the macros aren't needed.
It would be good to read memory-barriers.txt to understand when to use
the read/write macros.

[PATCH v12 10/18] kunit: test: add tests for kunit test abort

[Brendan Higgins]

Add KUnit tests for the KUnit test abort mechanism (see preceding
commit). Add tests both for general try catch mechanism as well as
non-architecture specific mechanism.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 kunit/Makefile    |   3 +-
 kunit/test-test.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 1 deletion(-)
 create mode 100644 kunit/test-test.c

diff --git a/kunit/Makefile b/kunit/Makefile
index c9176c9c578c6..769d9402b5d3a 100644
--- a/kunit/Makefile
+++ b/kunit/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_KUNIT) +=			test.o \
 					assert.o \
 					try-catch.o
 
-obj-$(CONFIG_KUNIT_TEST) +=		string-stream-test.o
+obj-$(CONFIG_KUNIT_TEST) +=		test-test.o \
+					string-stream-test.o
 
 obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=	example-test.o
diff --git a/kunit/test-test.c b/kunit/test-test.c
new file mode 100644
index 0000000000000..88f4cdf03db2a
--- /dev/null
+++ b/kunit/test-test.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for core test infrastructure.
+ *
+ * Copyright (C) 2019, Google LLC.
+ * Author: Brendan Higgins <brendanhiggins@google.com>
+ */
+#include <kunit/test.h>
+
+struct kunit_try_catch_test_context {
+	struct kunit_try_catch *try_catch;
+	bool function_called;
+};
+
+void kunit_test_successful_try(void *data)
+{
+	struct kunit *test = data;
+	struct kunit_try_catch_test_context *ctx = test->priv;
+
+	ctx->function_called = true;
+}
+
+void kunit_test_no_catch(void *data)
+{
+	struct kunit *test = data;
+
+	KUNIT_FAIL(test, "Catch should not be called\n");
+}
+
+static void kunit_test_try_catch_successful_try_no_catch(struct kunit *test)
+{
+	struct kunit_try_catch_test_context *ctx = test->priv;
+	struct kunit_try_catch *try_catch = ctx->try_catch;
+
+	kunit_try_catch_init(try_catch,
+			     test,
+			     kunit_test_successful_try,
+			     kunit_test_no_catch);
+	kunit_try_catch_run(try_catch, test);
+
+	KUNIT_EXPECT_TRUE(test, ctx->function_called);
+}
+
+void kunit_test_unsuccessful_try(void *data)
+{
+	struct kunit *test = data;
+	struct kunit_try_catch_test_context *ctx = test->priv;
+	struct kunit_try_catch *try_catch = ctx->try_catch;
+
+	kunit_try_catch_throw(try_catch);
+	KUNIT_FAIL(test, "This line should never be reached\n");
+}
+
+void kunit_test_catch(void *data)
+{
+	struct kunit *test = data;
+	struct kunit_try_catch_test_context *ctx = test->priv;
+
+	ctx->function_called = true;
+}
+
+static void kunit_test_try_catch_unsuccessful_try_does_catch(struct kunit *test)
+{
+	struct kunit_try_catch_test_context *ctx = test->priv;
+	struct kunit_try_catch *try_catch = ctx->try_catch;
+
+	kunit_try_catch_init(try_catch,
+			     test,
+			     kunit_test_unsuccessful_try,
+			     kunit_test_catch);
+	kunit_try_catch_run(try_catch, test);
+
+	KUNIT_EXPECT_TRUE(test, ctx->function_called);
+}
+
+static int kunit_try_catch_test_init(struct kunit *test)
+{
+	struct kunit_try_catch_test_context *ctx;
+
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	test->priv = ctx;
+
+	ctx->try_catch = kunit_kmalloc(test,
+				       sizeof(*ctx->try_catch),
+				       GFP_KERNEL);
+
+	return 0;
+}
+
+static struct kunit_case kunit_try_catch_test_cases[] = {
+	KUNIT_CASE(kunit_test_try_catch_successful_try_no_catch),
+	KUNIT_CASE(kunit_test_try_catch_unsuccessful_try_does_catch),
+	{}
+};
+
+static struct kunit_suite kunit_try_catch_test_suite = {
+	.name = "kunit-try-catch-test",
+	.init = kunit_try_catch_test_init,
+	.test_cases = kunit_try_catch_test_cases,
+};
+kunit_test_suite(kunit_try_catch_test_suite);
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 10/18] kunit: test: add tests for kunit test abort

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:13)
> +
> +static int kunit_try_catch_test_init(struct kunit *test)
> +{
> +       struct kunit_try_catch_test_context *ctx;
> +
> +       ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);

Can this fail? Should return -ENOMEM in that case?

> +       test->priv = ctx;
> +
> +       ctx->try_catch = kunit_kmalloc(test,
> +                                      sizeof(*ctx->try_catch),
> +                                      GFP_KERNEL);

Re: [PATCH v12 10/18] kunit: test: add tests for kunit test abort

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:24 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:13)
> > +
> > +static int kunit_try_catch_test_init(struct kunit *test)
> > +{
> > +       struct kunit_try_catch_test_context *ctx;
> > +
> > +       ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
>
> Can this fail? Should return -ENOMEM in that case?

Yes, I should do that.

> > +       test->priv = ctx;
> > +
> > +       ctx->try_catch = kunit_kmalloc(test,
> > +                                      sizeof(*ctx->try_catch),
> > +                                      GFP_KERNEL);

Re: [PATCH v12 10/18] kunit: test: add tests for kunit test abort

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 22:06:04)
> On Mon, Aug 12, 2019 at 9:24 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Brendan Higgins (2019-08-12 11:24:13)
> > > +
> > > +static int kunit_try_catch_test_init(struct kunit *test)
> > > +{
> > > +       struct kunit_try_catch_test_context *ctx;
> > > +
> > > +       ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
> >
> > Can this fail? Should return -ENOMEM in that case?
> 
> Yes, I should do that.

Looks like it's asserted to not be an error. If it's pushed into the API
then there's nothing to do here, and you can have my reviewed-by on this
patch.

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

Re: [PATCH v12 10/18] kunit: test: add tests for kunit test abort

[Brendan Higgins]

On Mon, Aug 12, 2019 at 10:57 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 22:06:04)
> > On Mon, Aug 12, 2019 at 9:24 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > >
> > > Quoting Brendan Higgins (2019-08-12 11:24:13)
> > > > +
> > > > +static int kunit_try_catch_test_init(struct kunit *test)
> > > > +{
> > > > +       struct kunit_try_catch_test_context *ctx;
> > > > +
> > > > +       ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
> > >
> > > Can this fail? Should return -ENOMEM in that case?
> >
> > Yes, I should do that.
>
> Looks like it's asserted to not be an error. If it's pushed into the API
> then there's nothing to do here, and you can have my reviewed-by on this
> patch.
>
> Reviewed-by: Stephen Boyd <sboyd@kernel.org>

Cool, thanks!

[PATCH v12 11/18] kunit: test: add the concept of assertions

[Brendan Higgins]

Add support for assertions which are like expectations except the test
terminates if the assertion is not satisfied.

The idea with assertions is that you use them to state all the
preconditions for your test. Logically speaking, these are the premises
of the test case, so if a premise isn't true, there is no point in
continuing the test case because there are no conclusions that can be
drawn without the premises. Whereas, the expectation is the thing you
are trying to prove. It is not used universally in x-unit style test
frameworks, but I really like it as a convention.  You could still
express the idea of a premise using the above idiom, but I think
KUNIT_ASSERT_* states the intended idea perfectly.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 include/kunit/test.h       | 297 ++++++++++++++++++++++++++++++++++++-
 kunit/string-stream-test.c |  12 +-
 kunit/test-test.c          |   2 +
 3 files changed, 302 insertions(+), 9 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 93381f841e09f..dcebaca456a1f 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -86,9 +86,10 @@ struct kunit;
  * @name: the name of the test case.
  *
  * A test case is a function with the signature, ``void (*)(struct kunit *)``
- * that makes expectations (see KUNIT_EXPECT_TRUE()) about code under test. Each
- * test case is associated with a &struct kunit_suite and will be run after the
- * suite's init function and followed by the suite's exit function.
+ * that makes expectations and assertions (see KUNIT_EXPECT_TRUE() and
+ * KUNIT_ASSERT_TRUE()) about code under test. Each test case is associated with
+ * a &struct kunit_suite and will be run after the suite's init function and
+ * followed by the suite's exit function.
  *
  * A test case should be static and should only be created with the KUNIT_CASE()
  * macro; additionally, every array of test cases should be terminated with an
@@ -1176,4 +1177,294 @@ do {									       \
 							fmt,		       \
 							##__VA_ARGS__)
 
+#define KUNIT_ASSERT_FAILURE(test, fmt, ...) \
+		KUNIT_FAIL_ASSERTION(test, KUNIT_ASSERTION, fmt, ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_TRUE() - Sets an assertion that @condition is true.
+ * @test: The test context object.
+ * @condition: an arbitrary boolean expression. The test fails and aborts when
+ * this does not evaluate to true.
+ *
+ * This and assertions of the form `KUNIT_ASSERT_*` will cause the test case to
+ * fail *and immediately abort* when the specified condition is not met. Unlike
+ * an expectation failure, it will prevent the test case from continuing to run;
+ * this is otherwise known as an *assertion failure*.
+ */
+#define KUNIT_ASSERT_TRUE(test, condition) \
+		KUNIT_TRUE_ASSERTION(test, KUNIT_ASSERTION, condition)
+
+#define KUNIT_ASSERT_TRUE_MSG(test, condition, fmt, ...)		       \
+		KUNIT_TRUE_MSG_ASSERTION(test,				       \
+					 KUNIT_ASSERTION,		       \
+					 condition,			       \
+					 fmt,				       \
+					 ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_FALSE() - Sets an assertion that @condition is false.
+ * @test: The test context object.
+ * @condition: an arbitrary boolean expression.
+ *
+ * Sets an assertion that the value that @condition evaluates to is false. This
+ * is the same as KUNIT_EXPECT_FALSE(), except it causes an assertion failure
+ * (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_FALSE(test, condition)				       \
+		KUNIT_FALSE_ASSERTION(test, KUNIT_ASSERTION, condition)
+
+#define KUNIT_ASSERT_FALSE_MSG(test, condition, fmt, ...)		       \
+		KUNIT_FALSE_MSG_ASSERTION(test,				       \
+					  KUNIT_ASSERTION,		       \
+					  condition,			       \
+					  fmt,				       \
+					  ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_EQ() - Sets an assertion that @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the values that @left and @right evaluate to are
+ * equal. This is the same as KUNIT_EXPECT_EQ(), except it causes an assertion
+ * failure (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_EQ(test, left, right) \
+		KUNIT_BINARY_EQ_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_EQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_EQ_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_PTR_EQ() - Asserts that pointers @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a pointer.
+ * @right: an arbitrary expression that evaluates to a pointer.
+ *
+ * Sets an assertion that the values that @left and @right evaluate to are
+ * equal. This is the same as KUNIT_EXPECT_EQ(), except it causes an assertion
+ * failure (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_PTR_EQ(test, left, right) \
+		KUNIT_BINARY_PTR_EQ_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right)
+
+#define KUNIT_ASSERT_PTR_EQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_PTR_EQ_MSG_ASSERTION(test,			       \
+						  KUNIT_ASSERTION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_NE() - An assertion that @left and @right are not equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the values that @left and @right evaluate to are not
+ * equal. This is the same as KUNIT_EXPECT_NE(), except it causes an assertion
+ * failure (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_NE(test, left, right) \
+		KUNIT_BINARY_NE_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_NE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_NE_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_PTR_NE() - Asserts that pointers @left and @right are not equal.
+ * KUNIT_ASSERT_PTR_EQ() - Asserts that pointers @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a pointer.
+ * @right: an arbitrary expression that evaluates to a pointer.
+ *
+ * Sets an assertion that the values that @left and @right evaluate to are not
+ * equal. This is the same as KUNIT_EXPECT_NE(), except it causes an assertion
+ * failure (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_PTR_NE(test, left, right) \
+		KUNIT_BINARY_PTR_NE_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right)
+
+#define KUNIT_ASSERT_PTR_NE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_PTR_NE_MSG_ASSERTION(test,			       \
+						  KUNIT_ASSERTION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+/**
+ * KUNIT_ASSERT_LT() - An assertion that @left is less than @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the value that @left evaluates to is less than the
+ * value that @right evaluates to. This is the same as KUNIT_EXPECT_LT(), except
+ * it causes an assertion failure (see KUNIT_ASSERT_TRUE()) when the assertion
+ * is not met.
+ */
+#define KUNIT_ASSERT_LT(test, left, right) \
+		KUNIT_BINARY_LT_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_LT_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_LT_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+/**
+ * KUNIT_ASSERT_LE() - An assertion that @left is less than or equal to @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the value that @left evaluates to is less than or
+ * equal to the value that @right evaluates to. This is the same as
+ * KUNIT_EXPECT_LE(), except it causes an assertion failure (see
+ * KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_LE(test, left, right) \
+		KUNIT_BINARY_LE_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_LE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_LE_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+/**
+ * KUNIT_ASSERT_GT() - An assertion that @left is greater than @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the value that @left evaluates to is greater than the
+ * value that @right evaluates to. This is the same as KUNIT_EXPECT_GT(), except
+ * it causes an assertion failure (see KUNIT_ASSERT_TRUE()) when the assertion
+ * is not met.
+ */
+#define KUNIT_ASSERT_GT(test, left, right) \
+		KUNIT_BINARY_GT_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_GT_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_GT_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_GE() - Assertion that @left is greater than or equal to @right.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a primitive C type.
+ * @right: an arbitrary expression that evaluates to a primitive C type.
+ *
+ * Sets an assertion that the value that @left evaluates to is greater than the
+ * value that @right evaluates to. This is the same as KUNIT_EXPECT_GE(), except
+ * it causes an assertion failure (see KUNIT_ASSERT_TRUE()) when the assertion
+ * is not met.
+ */
+#define KUNIT_ASSERT_GE(test, left, right) \
+		KUNIT_BINARY_GE_ASSERTION(test, KUNIT_ASSERTION, left, right)
+
+#define KUNIT_ASSERT_GE_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_GE_MSG_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right,			       \
+					      fmt,			       \
+					      ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_STREQ() - An assertion that strings @left and @right are equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a null terminated string.
+ * @right: an arbitrary expression that evaluates to a null terminated string.
+ *
+ * Sets an assertion that the values that @left and @right evaluate to are
+ * equal. This is the same as KUNIT_EXPECT_STREQ(), except it causes an
+ * assertion failure (see KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_STREQ(test, left, right)				       \
+		KUNIT_BINARY_STR_EQ_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right)
+
+#define KUNIT_ASSERT_STREQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_STR_EQ_MSG_ASSERTION(test,			       \
+						  KUNIT_ASSERTION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_STRNEQ() - Expects that strings @left and @right are not equal.
+ * @test: The test context object.
+ * @left: an arbitrary expression that evaluates to a null terminated string.
+ * @right: an arbitrary expression that evaluates to a null terminated string.
+ *
+ * Sets an expectation that the values that @left and @right evaluate to are
+ * not equal. This is semantically equivalent to
+ * KUNIT_ASSERT_TRUE(@test, strcmp((@left), (@right))). See KUNIT_ASSERT_TRUE()
+ * for more information.
+ */
+#define KUNIT_ASSERT_STRNEQ(test, left, right)				       \
+		KUNIT_BINARY_STR_NE_ASSERTION(test,			       \
+					      KUNIT_ASSERTION,		       \
+					      left,			       \
+					      right)
+
+#define KUNIT_ASSERT_STRNEQ_MSG(test, left, right, fmt, ...)		       \
+		KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,			       \
+						  KUNIT_ASSERTION,	       \
+						  left,			       \
+						  right,		       \
+						  fmt,			       \
+						  ##__VA_ARGS__)
+
+/**
+ * KUNIT_ASSERT_NOT_ERR_OR_NULL() - Assertion that @ptr is not null and not err.
+ * @test: The test context object.
+ * @ptr: an arbitrary pointer.
+ *
+ * Sets an assertion that the value that @ptr evaluates to is not null and not
+ * an errno stored in a pointer. This is the same as
+ * KUNIT_EXPECT_NOT_ERR_OR_NULL(), except it causes an assertion failure (see
+ * KUNIT_ASSERT_TRUE()) when the assertion is not met.
+ */
+#define KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr)				       \
+		KUNIT_PTR_NOT_ERR_OR_NULL_ASSERTION(test,		       \
+						    KUNIT_ASSERTION,	       \
+						    ptr)
+
+#define KUNIT_ASSERT_NOT_ERR_OR_NULL_MSG(test, ptr, fmt, ...)		       \
+		KUNIT_PTR_NOT_ERR_OR_NULL_MSG_ASSERTION(test,		       \
+							KUNIT_ASSERTION,       \
+							ptr,		       \
+							fmt,		       \
+							##__VA_ARGS__)
+
 #endif /* _KUNIT_TEST_H */
diff --git a/kunit/string-stream-test.c b/kunit/string-stream-test.c
index 9cf08f9dadf36..fd928ab7d65a8 100644
--- a/kunit/string-stream-test.c
+++ b/kunit/string-stream-test.c
@@ -35,7 +35,7 @@ static void string_stream_test_get_string(struct kunit *test)
 	string_stream_add(stream, " %s", "bar");
 
 	output = string_stream_get_string(stream);
-	KUNIT_EXPECT_STREQ(test, output, "Foo bar");
+	KUNIT_ASSERT_STREQ(test, output, "Foo bar");
 }
 
 static void string_stream_test_add_and_clear(struct kunit *test)
@@ -48,15 +48,15 @@ static void string_stream_test_add_and_clear(struct kunit *test)
 		string_stream_add(stream, "A");
 
 	output = string_stream_get_string(stream);
-	KUNIT_EXPECT_STREQ(test, output, "AAAAAAAAAA");
-	KUNIT_EXPECT_EQ(test, stream->length, (size_t)10);
-	KUNIT_EXPECT_FALSE(test, string_stream_is_empty(stream));
+	KUNIT_ASSERT_STREQ(test, output, "AAAAAAAAAA");
+	KUNIT_ASSERT_EQ(test, stream->length, (size_t)10);
+	KUNIT_ASSERT_FALSE(test, string_stream_is_empty(stream));
 
 	string_stream_clear(stream);
 
 	output = string_stream_get_string(stream);
-	KUNIT_EXPECT_STREQ(test, output, "");
-	KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
+	KUNIT_ASSERT_STREQ(test, output, "");
+	KUNIT_ASSERT_TRUE(test, string_stream_is_empty(stream));
 }
 
 static struct kunit_case string_stream_test_cases[] = {
diff --git a/kunit/test-test.c b/kunit/test-test.c
index 88f4cdf03db2a..058f3fb37458a 100644
--- a/kunit/test-test.c
+++ b/kunit/test-test.c
@@ -78,11 +78,13 @@ static int kunit_try_catch_test_init(struct kunit *test)
 	struct kunit_try_catch_test_context *ctx;
 
 	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 	test->priv = ctx;
 
 	ctx->try_catch = kunit_kmalloc(test,
 				       sizeof(*ctx->try_catch),
 				       GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->try_catch);
 
 	return 0;
 }
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 11/18] kunit: test: add the concept of assertions

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:14)
> Add support for assertions which are like expectations except the test
> terminates if the assertion is not satisfied.
> 
> The idea with assertions is that you use them to state all the
> preconditions for your test. Logically speaking, these are the premises
> of the test case, so if a premise isn't true, there is no point in
> continuing the test case because there are no conclusions that can be
> drawn without the premises. Whereas, the expectation is the thing you
> are trying to prove. It is not used universally in x-unit style test
> frameworks, but I really like it as a convention.  You could still
> express the idea of a premise using the above idiom, but I think
> KUNIT_ASSERT_* states the intended idea perfectly.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

> + * Sets an expectation that the values that @left and @right evaluate to are
> + * not equal. This is semantically equivalent to
> + * KUNIT_ASSERT_TRUE(@test, strcmp((@left), (@right))). See KUNIT_ASSERT_TRUE()
> + * for more information.
> + */
> +#define KUNIT_ASSERT_STRNEQ(test, left, right)                                \
> +               KUNIT_BINARY_STR_NE_ASSERTION(test,                            \
> +                                             KUNIT_ASSERTION,                 \
> +                                             left,                            \
> +                                             right)
> +
> +#define KUNIT_ASSERT_STRNEQ_MSG(test, left, right, fmt, ...)                  \
> +               KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,                        \
> +                                                 KUNIT_ASSERTION,             \
> +                                                 left,                        \
> +                                                 right,                       \
> +                                                 fmt,                         \

Same question about tabbing too.

> diff --git a/kunit/test-test.c b/kunit/test-test.c
> index 88f4cdf03db2a..058f3fb37458a 100644
> --- a/kunit/test-test.c
> +++ b/kunit/test-test.c
> @@ -78,11 +78,13 @@ static int kunit_try_catch_test_init(struct kunit *test)
>         struct kunit_try_catch_test_context *ctx;
>  
>         ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
> +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);

Ah ok. Question still stands if kunit_kzalloc() should just have the
assertion on failure.

>         test->priv = ctx;
>  
>         ctx->try_catch = kunit_kmalloc(test,
>                                        sizeof(*ctx->try_catch),
>                                        GFP_KERNEL);
> +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->try_catch);
>  

Re: [PATCH v12 11/18] kunit: test: add the concept of assertions

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:55 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:14)
> > Add support for assertions which are like expectations except the test
> > terminates if the assertion is not satisfied.
> >
> > The idea with assertions is that you use them to state all the
> > preconditions for your test. Logically speaking, these are the premises
> > of the test case, so if a premise isn't true, there is no point in
> > continuing the test case because there are no conclusions that can be
> > drawn without the premises. Whereas, the expectation is the thing you
> > are trying to prove. It is not used universally in x-unit style test
> > frameworks, but I really like it as a convention.  You could still
> > express the idea of a premise using the above idiom, but I think
> > KUNIT_ASSERT_* states the intended idea perfectly.
> >
> > Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> > Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
>
> Reviewed-by: Stephen Boyd <sboyd@kernel.org>
>
> > + * Sets an expectation that the values that @left and @right evaluate to are
> > + * not equal. This is semantically equivalent to
> > + * KUNIT_ASSERT_TRUE(@test, strcmp((@left), (@right))). See KUNIT_ASSERT_TRUE()
> > + * for more information.
> > + */
> > +#define KUNIT_ASSERT_STRNEQ(test, left, right)                                \
> > +               KUNIT_BINARY_STR_NE_ASSERTION(test,                            \
> > +                                             KUNIT_ASSERTION,                 \
> > +                                             left,                            \
> > +                                             right)
> > +
> > +#define KUNIT_ASSERT_STRNEQ_MSG(test, left, right, fmt, ...)                  \
> > +               KUNIT_BINARY_STR_NE_MSG_ASSERTION(test,                        \
> > +                                                 KUNIT_ASSERTION,             \
> > +                                                 left,                        \
> > +                                                 right,                       \
> > +                                                 fmt,                         \
>
> Same question about tabbing too.

Yep. WIll fix.

> > diff --git a/kunit/test-test.c b/kunit/test-test.c
> > index 88f4cdf03db2a..058f3fb37458a 100644
> > --- a/kunit/test-test.c
> > +++ b/kunit/test-test.c
> > @@ -78,11 +78,13 @@ static int kunit_try_catch_test_init(struct kunit *test)
> >         struct kunit_try_catch_test_context *ctx;
> >
> >         ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
>
> Ah ok. Question still stands if kunit_kzalloc() should just have the
> assertion on failure.

Right. In the previous patch KUNIT_ASSERT_* doesn't exist yet, so I
can't use it. And rather than fall back to return -ENOMEM like I
should have, I evidently forgot to do that.

> >         test->priv = ctx;
> >
> >         ctx->try_catch = kunit_kmalloc(test,
> >                                        sizeof(*ctx->try_catch),
> >                                        GFP_KERNEL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->try_catch);
> >

[PATCH v12 12/18] kunit: test: add tests for KUnit managed resources

[Brendan Higgins]

From: Avinash Kondareddy <akndr41@gmail.com>

Add unit tests for KUnit managed resources. KUnit managed resources
(struct kunit_resource) are resources that are automatically cleaned up
at the end of a KUnit test, similar to the concept of devm_* managed
resources.

Signed-off-by: Avinash Kondareddy <akndr41@gmail.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 kunit/test-test.c | 225 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 225 insertions(+)

diff --git a/kunit/test-test.c b/kunit/test-test.c
index 058f3fb37458a..725f1486376fa 100644
--- a/kunit/test-test.c
+++ b/kunit/test-test.c
@@ -101,3 +101,228 @@ static struct kunit_suite kunit_try_catch_test_suite = {
 	.test_cases = kunit_try_catch_test_cases,
 };
 kunit_test_suite(kunit_try_catch_test_suite);
+
+/*
+ * Context for testing test managed resources
+ * is_resource_initialized is used to test arbitrary resources
+ */
+struct kunit_test_resource_context {
+	struct kunit test;
+	bool is_resource_initialized;
+	int allocate_order[2];
+	int free_order[2];
+};
+
+static int fake_resource_init(struct kunit_resource *res, void *context)
+{
+	struct kunit_test_resource_context *ctx = context;
+
+	res->allocation = &ctx->is_resource_initialized;
+	ctx->is_resource_initialized = true;
+	return 0;
+}
+
+static void fake_resource_free(struct kunit_resource *res)
+{
+	bool *is_resource_initialized = res->allocation;
+
+	*is_resource_initialized = false;
+}
+
+static void kunit_resource_test_init_resources(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx = test->priv;
+
+	kunit_init_test(&ctx->test, "testing_test_init_test");
+
+	KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_alloc_resource(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx = test->priv;
+	struct kunit_resource *res;
+	kunit_resource_free_t free = fake_resource_free;
+
+	res = kunit_alloc_and_get_resource(&ctx->test,
+					   fake_resource_init,
+					   fake_resource_free,
+					   GFP_KERNEL,
+					   ctx);
+
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res);
+	KUNIT_EXPECT_PTR_EQ(test,
+			    &ctx->is_resource_initialized,
+			    (bool *) res->allocation);
+	KUNIT_EXPECT_TRUE(test, list_is_last(&res->node, &ctx->test.resources));
+	KUNIT_EXPECT_PTR_EQ(test, free, res->free);
+}
+
+static void kunit_resource_test_free_resource(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx = test->priv;
+	struct kunit_resource *res = kunit_alloc_and_get_resource(
+			&ctx->test,
+			fake_resource_init,
+			fake_resource_free,
+			GFP_KERNEL,
+			ctx);
+
+	kunit_free_resource(&ctx->test, res);
+
+	KUNIT_EXPECT_FALSE(test, ctx->is_resource_initialized);
+	KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_cleanup_resources(struct kunit *test)
+{
+	int i;
+	struct kunit_test_resource_context *ctx = test->priv;
+	struct kunit_resource *resources[5];
+
+	for (i = 0; i < ARRAY_SIZE(resources); i++) {
+		resources[i] = kunit_alloc_and_get_resource(&ctx->test,
+							    fake_resource_init,
+							    fake_resource_free,
+							    GFP_KERNEL,
+							    ctx);
+	}
+
+	kunit_cleanup(&ctx->test);
+
+	KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
+}
+
+static void kunit_resource_test_mark_order(int order_array[],
+					   size_t order_size,
+					   int key)
+{
+	int i;
+
+	for (i = 0; i < order_size && order_array[i]; i++)
+		;
+
+	order_array[i] = key;
+}
+
+#define KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, order_field, key)		       \
+		kunit_resource_test_mark_order(ctx->order_field,	       \
+					       ARRAY_SIZE(ctx->order_field),   \
+					       key)
+
+static int fake_resource_2_init(struct kunit_resource *res, void *context)
+{
+	struct kunit_test_resource_context *ctx = context;
+
+	KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 2);
+
+	res->allocation = ctx;
+
+	return 0;
+}
+
+static void fake_resource_2_free(struct kunit_resource *res)
+{
+	struct kunit_test_resource_context *ctx = res->allocation;
+
+	KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 2);
+}
+
+static int fake_resource_1_init(struct kunit_resource *res, void *context)
+{
+	struct kunit_test_resource_context *ctx = context;
+
+	kunit_alloc_and_get_resource(&ctx->test,
+				     fake_resource_2_init,
+				     fake_resource_2_free,
+				     GFP_KERNEL,
+				     ctx);
+
+	KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 1);
+
+	res->allocation = ctx;
+
+	return 0;
+}
+
+static void fake_resource_1_free(struct kunit_resource *res)
+{
+	struct kunit_test_resource_context *ctx = res->allocation;
+
+	KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 1);
+}
+
+/*
+ * TODO(brendanhiggins@google.com): replace the arrays that keep track of the
+ * order of allocation and freeing with strict mocks using the IN_SEQUENCE macro
+ * to assert allocation and freeing order when the feature becomes available.
+ */
+static void kunit_resource_test_proper_free_ordering(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx = test->priv;
+
+	/* fake_resource_1 allocates a fake_resource_2 in its init. */
+	kunit_alloc_and_get_resource(&ctx->test,
+				     fake_resource_1_init,
+				     fake_resource_1_free,
+				     GFP_KERNEL,
+				     ctx);
+
+	/*
+	 * Since fake_resource_2_init calls KUNIT_RESOURCE_TEST_MARK_ORDER
+	 * before returning to fake_resource_1_init, it should be the first to
+	 * put its key in the allocate_order array.
+	 */
+	KUNIT_EXPECT_EQ(test, ctx->allocate_order[0], 2);
+	KUNIT_EXPECT_EQ(test, ctx->allocate_order[1], 1);
+
+	kunit_cleanup(&ctx->test);
+
+	/*
+	 * Because fake_resource_2 finishes allocation before fake_resource_1,
+	 * fake_resource_1 should be freed first since it could depend on
+	 * fake_resource_2.
+	 */
+	KUNIT_EXPECT_EQ(test, ctx->free_order[0], 1);
+	KUNIT_EXPECT_EQ(test, ctx->free_order[1], 2);
+}
+
+static int kunit_resource_test_init(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx =
+			kzalloc(sizeof(*ctx), GFP_KERNEL);
+
+	if (!ctx)
+		return -ENOMEM;
+
+	test->priv = ctx;
+
+	kunit_init_test(&ctx->test, "test_test_context");
+
+	return 0;
+}
+
+static void kunit_resource_test_exit(struct kunit *test)
+{
+	struct kunit_test_resource_context *ctx = test->priv;
+
+	kunit_cleanup(&ctx->test);
+	kfree(ctx);
+}
+
+static struct kunit_case kunit_resource_test_cases[] = {
+	KUNIT_CASE(kunit_resource_test_init_resources),
+	KUNIT_CASE(kunit_resource_test_alloc_resource),
+	KUNIT_CASE(kunit_resource_test_free_resource),
+	KUNIT_CASE(kunit_resource_test_cleanup_resources),
+	KUNIT_CASE(kunit_resource_test_proper_free_ordering),
+	{}
+};
+
+static struct kunit_suite kunit_resource_test_suite = {
+	.name = "kunit-resource-test",
+	.init = kunit_resource_test_init,
+	.exit = kunit_resource_test_exit,
+	.test_cases = kunit_resource_test_cases,
+};
+kunit_test_suite(kunit_resource_test_suite);
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 12/18] kunit: test: add tests for KUnit managed resources

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:15)
> +
> +static int kunit_resource_test_init(struct kunit *test)
> +{
> +       struct kunit_test_resource_context *ctx =
> +                       kzalloc(sizeof(*ctx), GFP_KERNEL);
> +
> +       if (!ctx)
> +               return -ENOMEM;

Should this use the test assertion logic to make sure that it's not
failing allocations during init? BTW, maybe kunit allocation APIs should
fail the test if they fail to allocate in general. Unless we're unit
testing failure to allocate problems.

> +
> +       test->priv = ctx;
> +
> +       kunit_init_test(&ctx->test, "test_test_context");
> +
> +       return 0;

Re: [PATCH v12 12/18] kunit: test: add tests for KUnit managed resources

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:31 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:15)
> > +
> > +static int kunit_resource_test_init(struct kunit *test)
> > +{
> > +       struct kunit_test_resource_context *ctx =
> > +                       kzalloc(sizeof(*ctx), GFP_KERNEL);
> > +
> > +       if (!ctx)
> > +               return -ENOMEM;
>
> Should this use the test assertion logic to make sure that it's not
> failing allocations during init?

Yep. Will fix.

> BTW, maybe kunit allocation APIs should
> fail the test if they fail to allocate in general. Unless we're unit
> testing failure to allocate problems.

Yeah, I thought about that. I wasn't sure how people would feel about
it, and I thought it would be a pain to tease out all the issues
arising from aborting in different contexts when someone might not
expect it.

I am thinking later we can have kunit_kmalloc_or_abort variants? And
then we can punt this issue to a later time?

> > +
> > +       test->priv = ctx;
> > +
> > +       kunit_init_test(&ctx->test, "test_test_context");
> > +
> > +       return 0;

Re: [PATCH v12 12/18] kunit: test: add tests for KUnit managed resources

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-13 00:57:33)
> On Mon, Aug 12, 2019 at 9:31 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > BTW, maybe kunit allocation APIs should
> > fail the test if they fail to allocate in general. Unless we're unit
> > testing failure to allocate problems.
> 
> Yeah, I thought about that. I wasn't sure how people would feel about
> it, and I thought it would be a pain to tease out all the issues
> arising from aborting in different contexts when someone might not
> expect it.
> 
> I am thinking later we can have kunit_kmalloc_or_abort variants? And
> then we can punt this issue to a later time?
> 

Sure. Sounds good.

[PATCH v12 13/18] kunit: tool: add Python wrappers for running KUnit tests

[Brendan Higgins]

From: Felix Guo <felixguoxiuping@gmail.com>

The ultimate goal is to create minimal isolated test binaries; in the
meantime we are using UML to provide the infrastructure to run tests, so
define an abstract way to configure and run tests that allow us to
change the context in which tests are built without affecting the user.
This also makes pretty and dynamic error reporting, and a lot of other
nice features easier.

kunit_config.py:
  - parse .config and Kconfig files.

kunit_kernel.py: provides helper functions to:
  - configure the kernel using kunitconfig.
  - build the kernel with the appropriate configuration.
  - provide function to invoke the kernel and stream the output back.

kunit_parser.py: parses raw logs returned out by kunit_kernel and
displays them in a user friendly way.

test_data/*: samples of test data for testing kunit.py, kunit_config.py,
etc.

Signed-off-by: Felix Guo <felixguoxiuping@gmail.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 tools/testing/kunit/.gitignore                |   3 +
 tools/testing/kunit/kunit.py                  | 116 +++++++
 tools/testing/kunit/kunit_config.py           |  66 ++++
 tools/testing/kunit/kunit_kernel.py           | 148 +++++++++
 tools/testing/kunit/kunit_parser.py           | 310 ++++++++++++++++++
 tools/testing/kunit/kunit_tool_test.py        | 206 ++++++++++++
 .../test_is_test_passed-all_passed.log        |  32 ++
 .../test_data/test_is_test_passed-crash.log   |  69 ++++
 .../test_data/test_is_test_passed-failure.log |  36 ++
 .../test_is_test_passed-no_tests_run.log      |  75 +++++
 .../test_output_isolated_correctly.log        | 106 ++++++
 .../test_data/test_read_from_file.kconfig     |  17 +
 12 files changed, 1184 insertions(+)
 create mode 100644 tools/testing/kunit/.gitignore
 create mode 100755 tools/testing/kunit/kunit.py
 create mode 100644 tools/testing/kunit/kunit_config.py
 create mode 100644 tools/testing/kunit/kunit_kernel.py
 create mode 100644 tools/testing/kunit/kunit_parser.py
 create mode 100755 tools/testing/kunit/kunit_tool_test.py
 create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-all_passed.log
 create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-crash.log
 create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-failure.log
 create mode 100644 tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log
 create mode 100644 tools/testing/kunit/test_data/test_output_isolated_correctly.log
 create mode 100644 tools/testing/kunit/test_data/test_read_from_file.kconfig

diff --git a/tools/testing/kunit/.gitignore b/tools/testing/kunit/.gitignore
new file mode 100644
index 0000000000000..c791ff59a37a9
--- /dev/null
+++ b/tools/testing/kunit/.gitignore
@@ -0,0 +1,3 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
\ No newline at end of file
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
new file mode 100755
index 0000000000000..da11bd62a4b82
--- /dev/null
+++ b/tools/testing/kunit/kunit.py
@@ -0,0 +1,116 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+#
+# A thin wrapper on top of the KUnit Kernel
+#
+# Copyright (C) 2019, Google LLC.
+# Author: Felix Guo <felixguoxiuping@gmail.com>
+# Author: Brendan Higgins <brendanhiggins@google.com>
+
+import argparse
+import sys
+import os
+import time
+
+from collections import namedtuple
+from enum import Enum, auto
+
+import kunit_config
+import kunit_kernel
+import kunit_parser
+
+KunitResult = namedtuple('KunitResult', ['status','result'])
+
+KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs', 'build_dir'])
+
+class KunitStatus(Enum):
+	SUCCESS = auto()
+	CONFIG_FAILURE = auto()
+	BUILD_FAILURE = auto()
+	TEST_FAILURE = auto()
+
+def run_tests(linux: kunit_kernel.LinuxSourceTree,
+	      request: KunitRequest) -> KunitResult:
+	config_start = time.time()
+	success = linux.build_reconfig(request.build_dir)
+	config_end = time.time()
+	if not success:
+		return KunitResult(KunitStatus.CONFIG_FAILURE, 'could not configure kernel')
+
+	kunit_parser.print_with_timestamp('Building KUnit Kernel ...')
+
+	build_start = time.time()
+	success = linux.build_um_kernel(request.jobs, request.build_dir)
+	build_end = time.time()
+	if not success:
+		return KunitResult(KunitStatus.BUILD_FAILURE, 'could not build kernel')
+
+	kunit_parser.print_with_timestamp('Starting KUnit Kernel ...')
+	test_start = time.time()
+
+	test_result = kunit_parser.TestResult(kunit_parser.TestStatus.SUCCESS,
+					      [],
+					      'Tests not Parsed.')
+	if request.raw_output:
+		kunit_parser.raw_output(
+			linux.run_kernel(timeout=request.timeout))
+	else:
+		kunit_output = linux.run_kernel(timeout=request.timeout)
+		test_result = kunit_parser.parse_run_tests(kunit_output)
+	test_end = time.time()
+
+	kunit_parser.print_with_timestamp((
+		'Elapsed time: %.3fs total, %.3fs configuring, %.3fs ' +
+		'building, %.3fs running\n') % (
+				test_end - config_start,
+				config_end - config_start,
+				build_end - build_start,
+				test_end - test_start))
+
+	if test_result.status != kunit_parser.TestStatus.SUCCESS:
+		return KunitResult(KunitStatus.TEST_FAILURE, test_result)
+	else:
+		return KunitResult(KunitStatus.SUCCESS, test_result)
+
+def main(argv, linux):
+	parser = argparse.ArgumentParser(
+			description='Helps writing and running KUnit tests.')
+	subparser = parser.add_subparsers(dest='subcommand')
+
+	run_parser = subparser.add_parser('run', help='Runs KUnit tests.')
+	run_parser.add_argument('--raw_output', help='don\'t format output from kernel',
+				action='store_true')
+
+	run_parser.add_argument('--timeout',
+				help='maximum number of seconds to allow for all tests '
+				'to run. This does not include time taken to build the '
+				'tests.',
+				type=int,
+				default=300,
+				metavar='timeout')
+
+	run_parser.add_argument('--jobs',
+				help='As in the make command, "Specifies  the number of '
+				'jobs (commands) to run simultaneously."',
+				type=int, default=8, metavar='jobs')
+
+	run_parser.add_argument('--build_dir',
+				help='As in the make command, it specifies the build '
+				'directory.',
+				type=str, default=None, metavar='build_dir')
+
+	cli_args = parser.parse_args(argv)
+
+	if cli_args.subcommand == 'run':
+		request = KunitRequest(cli_args.raw_output,
+				       cli_args.timeout,
+				       cli_args.jobs,
+				       cli_args.build_dir)
+		result = run_tests(linux, request)
+		if result.status != KunitStatus.SUCCESS:
+			sys.exit(1)
+	else:
+		parser.print_help()
+
+if __name__ == '__main__':
+	main(sys.argv[1:], kunit_kernel.LinuxSourceTree())
diff --git a/tools/testing/kunit/kunit_config.py b/tools/testing/kunit/kunit_config.py
new file mode 100644
index 0000000000000..ebf3942b23f51
--- /dev/null
+++ b/tools/testing/kunit/kunit_config.py
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Builds a .config from a kunitconfig.
+#
+# Copyright (C) 2019, Google LLC.
+# Author: Felix Guo <felixguoxiuping@gmail.com>
+# Author: Brendan Higgins <brendanhiggins@google.com>
+
+import collections
+import re
+
+CONFIG_IS_NOT_SET_PATTERN = r'^# CONFIG_\w+ is not set$'
+CONFIG_PATTERN = r'^CONFIG_\w+=\S+$'
+
+KconfigEntryBase = collections.namedtuple('KconfigEntry', ['raw_entry'])
+
+
+class KconfigEntry(KconfigEntryBase):
+
+	def __str__(self) -> str:
+		return self.raw_entry
+
+
+class KconfigParseError(Exception):
+	"""Error parsing Kconfig defconfig or .config."""
+
+
+class Kconfig(object):
+	"""Represents defconfig or .config specified using the Kconfig language."""
+
+	def __init__(self):
+		self._entries = []
+
+	def entries(self):
+		return set(self._entries)
+
+	def add_entry(self, entry: KconfigEntry) -> None:
+		self._entries.append(entry)
+
+	def is_subset_of(self, other: 'Kconfig') -> bool:
+		return self.entries().issubset(other.entries())
+
+	def write_to_file(self, path: str) -> None:
+		with open(path, 'w') as f:
+			for entry in self.entries():
+				f.write(str(entry) + '\n')
+
+	def parse_from_string(self, blob: str) -> None:
+		"""Parses a string containing KconfigEntrys and populates this Kconfig."""
+		self._entries = []
+		is_not_set_matcher = re.compile(CONFIG_IS_NOT_SET_PATTERN)
+		config_matcher = re.compile(CONFIG_PATTERN)
+		for line in blob.split('\n'):
+			line = line.strip()
+			if not line:
+				continue
+			elif config_matcher.match(line) or is_not_set_matcher.match(line):
+				self._entries.append(KconfigEntry(line))
+			elif line[0] == '#':
+				continue
+			else:
+				raise KconfigParseError('Failed to parse: ' + line)
+
+	def read_from_file(self, path: str) -> None:
+		with open(path, 'r') as f:
+			self.parse_from_string(f.read())
diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
new file mode 100644
index 0000000000000..07c0abf2f47df
--- /dev/null
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -0,0 +1,148 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Runs UML kernel, collects output, and handles errors.
+#
+# Copyright (C) 2019, Google LLC.
+# Author: Felix Guo <felixguoxiuping@gmail.com>
+# Author: Brendan Higgins <brendanhiggins@google.com>
+
+
+import logging
+import subprocess
+import os
+
+import kunit_config
+
+KCONFIG_PATH = '.config'
+
+class ConfigError(Exception):
+	"""Represents an error trying to configure the Linux kernel."""
+
+
+class BuildError(Exception):
+	"""Represents an error trying to build the Linux kernel."""
+
+
+class LinuxSourceTreeOperations(object):
+	"""An abstraction over command line operations performed on a source tree."""
+
+	def make_mrproper(self):
+		try:
+			subprocess.check_output(['make', 'mrproper'])
+		except OSError as e:
+			raise ConfigError('Could not call make command: ' + e)
+		except subprocess.CalledProcessError as e:
+			raise ConfigError(e.output)
+
+	def make_olddefconfig(self, build_dir):
+		command = ['make', 'ARCH=um', 'olddefconfig']
+		if build_dir:
+			command += ['O=' + build_dir]
+		try:
+			subprocess.check_output(command)
+		except OSError as e:
+			raise ConfigError('Could not call make command: ' + e)
+		except subprocess.CalledProcessError as e:
+			raise ConfigError(e.output)
+
+	def make(self, jobs, build_dir):
+		command = ['make', 'ARCH=um', '--jobs=' + str(jobs)]
+		if build_dir:
+			command += ['O=' + build_dir]
+		try:
+			subprocess.check_output(command)
+		except OSError as e:
+			raise BuildError('Could not call execute make: ' + e)
+		except subprocess.CalledProcessError as e:
+			raise BuildError(e.output)
+
+	def linux_bin(self, params, timeout, build_dir):
+		"""Runs the Linux UML binary. Must be named 'linux'."""
+		linux_bin = './linux'
+		if build_dir:
+			linux_bin = os.path.join(build_dir, 'linux')
+		process = subprocess.Popen(
+			[linux_bin] + params,
+			stdin=subprocess.PIPE,
+			stdout=subprocess.PIPE,
+			stderr=subprocess.PIPE)
+		process.wait(timeout=timeout)
+		return process
+
+
+def get_kconfig_path(build_dir):
+	kconfig_path = KCONFIG_PATH
+	if build_dir:
+		kconfig_path = os.path.join(build_dir, KCONFIG_PATH)
+	return kconfig_path
+
+class LinuxSourceTree(object):
+	"""Represents a Linux kernel source tree with KUnit tests."""
+
+	def __init__(self):
+		self._kconfig = kunit_config.Kconfig()
+		self._kconfig.read_from_file('kunitconfig')
+		self._ops = LinuxSourceTreeOperations()
+
+	def clean(self):
+		try:
+			self._ops.make_mrproper()
+		except ConfigError as e:
+			logging.error(e)
+			return False
+		return True
+
+	def build_config(self, build_dir):
+		kconfig_path = get_kconfig_path(build_dir)
+		if build_dir and not os.path.exists(build_dir):
+			os.mkdir(build_dir)
+		self._kconfig.write_to_file(kconfig_path)
+		try:
+			self._ops.make_olddefconfig(build_dir)
+		except ConfigError as e:
+			logging.error(e)
+			return False
+		validated_kconfig = kunit_config.Kconfig()
+		validated_kconfig.read_from_file(kconfig_path)
+		if not self._kconfig.is_subset_of(validated_kconfig):
+			logging.error('Provided Kconfig is not contained in validated .config!')
+			return False
+		return True
+
+	def build_reconfig(self, build_dir):
+		"""Creates a new .config if it is not a subset of the kunitconfig."""
+		kconfig_path = get_kconfig_path(build_dir)
+		if os.path.exists(kconfig_path):
+			existing_kconfig = kunit_config.Kconfig()
+			existing_kconfig.read_from_file(kconfig_path)
+			if not self._kconfig.is_subset_of(existing_kconfig):
+				print('Regenerating .config ...')
+				os.remove(kconfig_path)
+				return self.build_config(build_dir)
+			else:
+				return True
+		else:
+			print('Generating .config ...')
+			return self.build_config(build_dir)
+
+	def build_um_kernel(self, jobs, build_dir):
+		try:
+			self._ops.make_olddefconfig(build_dir)
+			self._ops.make(jobs, build_dir)
+		except (ConfigError, BuildError) as e:
+			logging.error(e)
+			return False
+		used_kconfig = kunit_config.Kconfig()
+		used_kconfig.read_from_file(get_kconfig_path(build_dir))
+		if not self._kconfig.is_subset_of(used_kconfig):
+			logging.error('Provided Kconfig is not contained in final config!')
+			return False
+		return True
+
+	def run_kernel(self, args=[], timeout=None, build_dir=None):
+		args.extend(['mem=256M'])
+		process = self._ops.linux_bin(args, timeout, build_dir)
+		with open('test.log', 'w') as f:
+			for line in process.stdout:
+				f.write(line.rstrip().decode('ascii') + '\n')
+				yield line.rstrip().decode('ascii')
diff --git a/tools/testing/kunit/kunit_parser.py b/tools/testing/kunit/kunit_parser.py
new file mode 100644
index 0000000000000..4ffbae0f67325
--- /dev/null
+++ b/tools/testing/kunit/kunit_parser.py
@@ -0,0 +1,310 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Parses test results from a kernel dmesg log.
+#
+# Copyright (C) 2019, Google LLC.
+# Author: Felix Guo <felixguoxiuping@gmail.com>
+# Author: Brendan Higgins <brendanhiggins@google.com>
+
+import re
+
+from collections import namedtuple
+from datetime import datetime
+from enum import Enum, auto
+from functools import reduce
+from typing import List
+
+TestResult = namedtuple('TestResult', ['status','suites','log'])
+
+class TestSuite(object):
+	def __init__(self):
+		self.status = None
+		self.name = None
+		self.cases = []
+
+	def __str__(self):
+		return 'TestSuite(' + self.status + ',' + self.name + ',' + str(self.cases) + ')'
+
+	def __repr__(self):
+		return str(self)
+
+class TestCase(object):
+	def __init__(self):
+		self.status = None
+		self.name = ''
+		self.log = []
+
+	def __str__(self):
+		return 'TestCase(' + self.status + ',' + self.name + ',' + str(self.log) + ')'
+
+	def __repr__(self):
+		return str(self)
+
+class TestStatus(Enum):
+	SUCCESS = auto()
+	FAILURE = auto()
+	TEST_CRASHED = auto()
+	NO_TESTS = auto()
+
+kunit_start_re = re.compile(r'^TAP version [0-9]+$')
+kunit_end_re = re.compile('List of all partitions:')
+
+def isolate_kunit_output(kernel_output):
+	started = False
+	for line in kernel_output:
+		if kunit_start_re.match(line):
+			started = True
+			yield line
+		elif kunit_end_re.match(line):
+			break
+		elif started:
+			yield line
+
+def raw_output(kernel_output):
+	for line in kernel_output:
+		print(line)
+
+DIVIDER = '=' * 60
+
+RESET = '\033[0;0m'
+
+def red(text):
+	return '\033[1;31m' + text + RESET
+
+def yellow(text):
+	return '\033[1;33m' + text + RESET
+
+def green(text):
+	return '\033[1;32m' + text + RESET
+
+def print_with_timestamp(message):
+	print('[%s] %s' % (datetime.now().strftime('%H:%M:%S'), message))
+
+def format_suite_divider(message):
+	return '======== ' + message + ' ========'
+
+def print_suite_divider(message):
+	print_with_timestamp(DIVIDER)
+	print_with_timestamp(format_suite_divider(message))
+
+def print_log(log):
+	for m in log:
+		print_with_timestamp(m)
+
+TAP_ENTRIES = re.compile(r'^(TAP|\t?ok|\t?not ok|\t?[0-9]+\.\.[0-9]+|\t?#).*$')
+
+def consume_non_diagnositic(lines: List[str]) -> None:
+	while lines and not TAP_ENTRIES.match(lines[0]):
+		lines.pop(0)
+
+def save_non_diagnositic(lines: List[str], test_case: TestCase) -> None:
+	while lines and not TAP_ENTRIES.match(lines[0]):
+		test_case.log.append(lines[0])
+		lines.pop(0)
+
+OkNotOkResult = namedtuple('OkNotOkResult', ['is_ok','description', 'text'])
+
+OK_NOT_OK_SUBTEST = re.compile(r'^\t(ok|not ok) [0-9]+ - (.*)$')
+
+OK_NOT_OK_MODULE = re.compile(r'^(ok|not ok) [0-9]+ - (.*)$')
+
+def parse_ok_not_ok_test_case(lines: List[str],
+			      test_case: TestCase,
+			      expecting_test_case: bool) -> bool:
+	save_non_diagnositic(lines, test_case)
+	if not lines:
+		if expecting_test_case:
+			test_case.status = TestStatus.TEST_CRASHED
+			return True
+		else:
+			return False
+	line = lines[0]
+	match = OK_NOT_OK_SUBTEST.match(line)
+	if match:
+		test_case.log.append(lines.pop(0))
+		test_case.name = match.group(2)
+		if test_case.status == TestStatus.TEST_CRASHED:
+			return True
+		if match.group(1) == 'ok':
+			test_case.status = TestStatus.SUCCESS
+		else:
+			test_case.status = TestStatus.FAILURE
+		return True
+	else:
+		return False
+
+SUBTEST_DIAGNOSTIC = re.compile(r'^\t# .*?: (.*)$')
+DIAGNOSTIC_CRASH_MESSAGE = 'kunit test case crashed!'
+
+def parse_diagnostic(lines: List[str], test_case: TestCase) -> bool:
+	save_non_diagnositic(lines, test_case)
+	if not lines:
+		return False
+	line = lines[0]
+	match = SUBTEST_DIAGNOSTIC.match(line)
+	if match:
+		test_case.log.append(lines.pop(0))
+		if match.group(1) == DIAGNOSTIC_CRASH_MESSAGE:
+			test_case.status = TestStatus.TEST_CRASHED
+		return True
+	else:
+		return False
+
+def parse_test_case(lines: List[str], expecting_test_case: bool) -> TestCase:
+	test_case = TestCase()
+	save_non_diagnositic(lines, test_case)
+	while parse_diagnostic(lines, test_case):
+		pass
+	if parse_ok_not_ok_test_case(lines, test_case, expecting_test_case):
+		return test_case
+	else:
+		return None
+
+SUBTEST_HEADER = re.compile(r'^\t# Subtest: (.*)$')
+
+def parse_subtest_header(lines: List[str]) -> str:
+	consume_non_diagnositic(lines)
+	if not lines:
+		return None
+	match = SUBTEST_HEADER.match(lines[0])
+	if match:
+		lines.pop(0)
+		return match.group(1)
+	else:
+		return None
+
+SUBTEST_PLAN = re.compile(r'\t[0-9]+\.\.([0-9]+)')
+
+def parse_subtest_plan(lines: List[str]) -> int:
+	consume_non_diagnositic(lines)
+	match = SUBTEST_PLAN.match(lines[0])
+	if match:
+		lines.pop(0)
+		return int(match.group(1))
+	else:
+		return None
+
+def max_status(left: TestStatus, right: TestStatus) -> TestStatus:
+	if left == TestStatus.TEST_CRASHED or right == TestStatus.TEST_CRASHED:
+		return TestStatus.TEST_CRASHED
+	elif left == TestStatus.FAILURE or right == TestStatus.FAILURE:
+		return TestStatus.FAILURE
+	elif left != TestStatus.SUCCESS:
+		return left
+	elif right != TestStatus.SUCCESS:
+		return right
+	else:
+		return TestStatus.SUCCESS
+
+def parse_ok_not_ok_test_suite(lines: List[str], test_suite: TestSuite) -> bool:
+	consume_non_diagnositic(lines)
+	if not lines:
+		test_suite.status = TestStatus.TEST_CRASHED
+		return False
+	line = lines[0]
+	match = OK_NOT_OK_MODULE.match(line)
+	if match:
+		lines.pop(0)
+		if match.group(1) == 'ok':
+			test_suite.status = TestStatus.SUCCESS
+		else:
+			test_suite.status = TestStatus.FAILURE
+		return True
+	else:
+		return False
+
+def bubble_up_errors(to_status, status_container_list) -> TestStatus:
+	status_list = map(to_status, status_container_list)
+	return reduce(max_status, status_list, TestStatus.SUCCESS)
+
+def bubble_up_test_case_errors(test_suite: TestSuite) -> TestStatus:
+	max_test_case_status = bubble_up_errors(lambda x: x.status, test_suite.cases)
+	return max_status(max_test_case_status, test_suite.status)
+
+def parse_test_suite(lines: List[str]) -> TestSuite:
+	if not lines:
+		return None
+	consume_non_diagnositic(lines)
+	test_suite = TestSuite()
+	test_suite.status = TestStatus.SUCCESS
+	name = parse_subtest_header(lines)
+	if not name:
+		return None
+	test_suite.name = name
+	expected_test_case_num = parse_subtest_plan(lines)
+	if not expected_test_case_num:
+		return None
+	test_case = parse_test_case(lines, expected_test_case_num > 0)
+	expected_test_case_num -= 1
+	while test_case:
+		test_suite.cases.append(test_case)
+		test_case = parse_test_case(lines, expected_test_case_num > 0)
+		expected_test_case_num -= 1
+	if parse_ok_not_ok_test_suite(lines, test_suite):
+		test_suite.status = bubble_up_test_case_errors(test_suite)
+		return test_suite
+	elif not lines:
+		print_with_timestamp(red('[ERROR] ') + 'ran out of lines before end token')
+		return test_suite
+	else:
+		print('failed to parse end of suite' + lines[0])
+		return None
+
+TAP_HEADER = re.compile(r'^TAP version 14$')
+
+def parse_tap_header(lines: List[str]) -> bool:
+	consume_non_diagnositic(lines)
+	if TAP_HEADER.match(lines[0]):
+		lines.pop(0)
+		return True
+	else:
+		return False
+
+def bubble_up_suite_errors(test_suite_list: List[TestSuite]) -> TestStatus:
+	return bubble_up_errors(lambda x: x.status, test_suite_list)
+
+def parse_test_result(lines: List[str]) -> TestResult:
+	if not lines:
+		return TestResult(TestStatus.NO_TESTS, [], lines)
+	consume_non_diagnositic(lines)
+	if not parse_tap_header(lines):
+		return None
+	test_suites = []
+	test_suite = parse_test_suite(lines)
+	while test_suite:
+		test_suites.append(test_suite)
+		test_suite = parse_test_suite(lines)
+	return TestResult(bubble_up_suite_errors(test_suites), test_suites, lines)
+
+def parse_run_tests(kernel_output) -> TestResult:
+	total_tests = 0
+	failed_tests = 0
+	crashed_tests = 0
+	test_result = parse_test_result(list(isolate_kunit_output(kernel_output)))
+	for test_suite in test_result.suites:
+		if test_suite.status == TestStatus.SUCCESS:
+			print_suite_divider(green('[PASSED] ') + test_suite.name)
+		elif test_suite.status == TestStatus.TEST_CRASHED:
+			print_suite_divider(red('[CRASHED] ' + test_suite.name))
+		else:
+			print_suite_divider(red('[FAILED] ') + test_suite.name)
+		for test_case in test_suite.cases:
+			total_tests += 1
+			if test_case.status == TestStatus.SUCCESS:
+				print_with_timestamp(green('[PASSED] ') + test_case.name)
+			elif test_case.status == TestStatus.TEST_CRASHED:
+				crashed_tests += 1
+				print_with_timestamp(red('[CRASHED] ' + test_case.name))
+				print_log(map(yellow, test_case.log))
+				print_with_timestamp('')
+			else:
+				failed_tests += 1
+				print_with_timestamp(red('[FAILED] ') + test_case.name)
+				print_log(map(yellow, test_case.log))
+				print_with_timestamp('')
+	print_with_timestamp(DIVIDER)
+	fmt = green if test_result.status == TestStatus.SUCCESS else red
+	print_with_timestamp(
+		fmt('Testing complete. %d tests run. %d failed. %d crashed.' %
+		    (total_tests, failed_tests, crashed_tests)))
+	return test_result
diff --git a/tools/testing/kunit/kunit_tool_test.py b/tools/testing/kunit/kunit_tool_test.py
new file mode 100755
index 0000000000000..4a12baa0cd4e0
--- /dev/null
+++ b/tools/testing/kunit/kunit_tool_test.py
@@ -0,0 +1,206 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+#
+# A collection of tests for tools/testing/kunit/kunit.py
+#
+# Copyright (C) 2019, Google LLC.
+# Author: Brendan Higgins <brendanhiggins@google.com>
+
+import unittest
+from unittest import mock
+
+import tempfile, shutil # Handling test_tmpdir
+
+import os
+
+import kunit_config
+import kunit_parser
+import kunit_kernel
+import kunit
+
+test_tmpdir = ''
+
+def setUpModule():
+	global test_tmpdir
+	test_tmpdir = tempfile.mkdtemp()
+
+def tearDownModule():
+	shutil.rmtree(test_tmpdir)
+
+def get_absolute_path(path):
+	return os.path.join(os.path.dirname(__file__), path)
+
+class KconfigTest(unittest.TestCase):
+
+	def test_is_subset_of(self):
+		kconfig0 = kunit_config.Kconfig()
+		self.assertTrue(kconfig0.is_subset_of(kconfig0))
+
+		kconfig1 = kunit_config.Kconfig()
+		kconfig1.add_entry(kunit_config.KconfigEntry('CONFIG_TEST=y'))
+		self.assertTrue(kconfig1.is_subset_of(kconfig1))
+		self.assertTrue(kconfig0.is_subset_of(kconfig1))
+		self.assertFalse(kconfig1.is_subset_of(kconfig0))
+
+	def test_read_from_file(self):
+		kconfig = kunit_config.Kconfig()
+		kconfig_path = get_absolute_path(
+			'test_data/test_read_from_file.kconfig')
+
+		kconfig.read_from_file(kconfig_path)
+
+		expected_kconfig = kunit_config.Kconfig()
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_UML=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_MMU=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_TEST=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_EXAMPLE_TEST=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('# CONFIG_MK8 is not set'))
+
+		self.assertEqual(kconfig.entries(), expected_kconfig.entries())
+
+	def test_write_to_file(self):
+		kconfig_path = os.path.join(test_tmpdir, '.config')
+
+		expected_kconfig = kunit_config.Kconfig()
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_UML=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_MMU=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_TEST=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('CONFIG_EXAMPLE_TEST=y'))
+		expected_kconfig.add_entry(
+			kunit_config.KconfigEntry('# CONFIG_MK8 is not set'))
+
+		expected_kconfig.write_to_file(kconfig_path)
+
+		actual_kconfig = kunit_config.Kconfig()
+		actual_kconfig.read_from_file(kconfig_path)
+
+		self.assertEqual(actual_kconfig.entries(),
+				 expected_kconfig.entries())
+
+class KUnitParserTest(unittest.TestCase):
+
+	def assertContains(self, needle, haystack):
+		for line in haystack:
+			if needle in line:
+				return
+		raise AssertionError('"' +
+			str(needle) + '" not found in "' + str(haystack) + '"!')
+
+	def test_output_isolated_correctly(self):
+		log_path = get_absolute_path(
+			'test_data/test_output_isolated_correctly.log')
+		file = open(log_path)
+		result = kunit_parser.isolate_kunit_output(file.readlines())
+		self.assertContains('TAP version 14\n', result)
+		self.assertContains('	# Subtest: example', result)
+		self.assertContains('	1..2', result)
+		self.assertContains('	ok 1 - example_simple_test', result)
+		self.assertContains('	ok 2 - example_mock_test', result)
+		self.assertContains('ok 1 - example', result)
+		file.close()
+
+	def test_parse_successful_test_log(self):
+		all_passed_log = get_absolute_path(
+			'test_data/test_is_test_passed-all_passed.log')
+		file = open(all_passed_log)
+		result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual(
+			kunit_parser.TestStatus.SUCCESS,
+			result.status)
+		file.close()
+
+	def test_parse_failed_test_log(self):
+		failed_log = get_absolute_path(
+			'test_data/test_is_test_passed-failure.log')
+		file = open(failed_log)
+		result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual(
+			kunit_parser.TestStatus.FAILURE,
+			result.status)
+		file.close()
+
+	def test_no_tests(self):
+		empty_log = get_absolute_path(
+			'test_data/test_is_test_passed-no_tests_run.log')
+		file = open(empty_log)
+		result = kunit_parser.parse_run_tests(
+			kunit_parser.isolate_kunit_output(file.readlines()))
+		self.assertEqual(0, len(result.suites))
+		self.assertEqual(
+			kunit_parser.TestStatus.NO_TESTS,
+			result.status)
+		file.close()
+
+	def test_crashed_test(self):
+		crashed_log = get_absolute_path(
+			'test_data/test_is_test_passed-crash.log')
+		file = open(crashed_log)
+		result = kunit_parser.parse_run_tests(file.readlines())
+		self.assertEqual(
+			kunit_parser.TestStatus.TEST_CRASHED,
+			result.status)
+		file.close()
+
+class StrContains(str):
+	def __eq__(self, other):
+		return self in other
+
+class KUnitMainTest(unittest.TestCase):
+	def setUp(self):
+		path = get_absolute_path('test_data/test_is_test_passed-all_passed.log')
+		file = open(path)
+		all_passed_log = file.readlines()
+		self.print_patch = mock.patch('builtins.print')
+		self.print_mock = self.print_patch.start()
+		self.linux_source_mock = mock.Mock()
+		self.linux_source_mock.build_reconfig = mock.Mock(return_value=True)
+		self.linux_source_mock.build_um_kernel = mock.Mock(return_value=True)
+		self.linux_source_mock.run_kernel = mock.Mock(return_value=all_passed_log)
+
+	def tearDown(self):
+		self.print_patch.stop()
+		pass
+
+	def test_run_passes_args_pass(self):
+		kunit.main(['run'], self.linux_source_mock)
+		assert self.linux_source_mock.build_reconfig.call_count == 1
+		assert self.linux_source_mock.run_kernel.call_count == 1
+		self.print_mock.assert_any_call(StrContains('Testing complete.'))
+
+	def test_run_passes_args_fail(self):
+		self.linux_source_mock.run_kernel = mock.Mock(return_value=[])
+		with self.assertRaises(SystemExit) as e:
+			kunit.main(['run'], self.linux_source_mock)
+		assert type(e.exception) == SystemExit
+		assert e.exception.code == 1
+		assert self.linux_source_mock.build_reconfig.call_count == 1
+		assert self.linux_source_mock.run_kernel.call_count == 1
+		self.print_mock.assert_any_call(StrContains(' 0 tests run'))
+
+	def test_run_raw_output(self):
+		self.linux_source_mock.run_kernel = mock.Mock(return_value=[])
+		kunit.main(['run', '--raw_output'], self.linux_source_mock)
+		assert self.linux_source_mock.build_reconfig.call_count == 1
+		assert self.linux_source_mock.run_kernel.call_count == 1
+		for kall in self.print_mock.call_args_list:
+			assert kall != mock.call(StrContains('Testing complete.'))
+			assert kall != mock.call(StrContains(' 0 tests run'))
+
+	def test_run_timeout(self):
+		timeout = 3453
+		kunit.main(['run', '--timeout', str(timeout)], self.linux_source_mock)
+		assert self.linux_source_mock.build_reconfig.call_count == 1
+		self.linux_source_mock.run_kernel.assert_called_once_with(timeout=timeout)
+		self.print_mock.assert_any_call(StrContains('Testing complete.'))
+
+if __name__ == '__main__':
+	unittest.main()
diff --git a/tools/testing/kunit/test_data/test_is_test_passed-all_passed.log b/tools/testing/kunit/test_data/test_is_test_passed-all_passed.log
new file mode 100644
index 0000000000000..62ebc0288355c
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-all_passed.log
@@ -0,0 +1,32 @@
+TAP version 14
+	# Subtest: sysctl_test
+	1..8
+	# sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
+	ok 1 - sysctl_test_dointvec_null_tbl_data
+	# sysctl_test_dointvec_table_maxlen_unset: sysctl_test_dointvec_table_maxlen_unset passed
+	ok 2 - sysctl_test_dointvec_table_maxlen_unset
+	# sysctl_test_dointvec_table_len_is_zero: sysctl_test_dointvec_table_len_is_zero passed
+	ok 3 - sysctl_test_dointvec_table_len_is_zero
+	# sysctl_test_dointvec_table_read_but_position_set: sysctl_test_dointvec_table_read_but_position_set passed
+	ok 4 - sysctl_test_dointvec_table_read_but_position_set
+	# sysctl_test_dointvec_happy_single_positive: sysctl_test_dointvec_happy_single_positive passed
+	ok 5 - sysctl_test_dointvec_happy_single_positive
+	# sysctl_test_dointvec_happy_single_negative: sysctl_test_dointvec_happy_single_negative passed
+	ok 6 - sysctl_test_dointvec_happy_single_negative
+	# sysctl_test_dointvec_single_less_int_min: sysctl_test_dointvec_single_less_int_min passed
+	ok 7 - sysctl_test_dointvec_single_less_int_min
+	# sysctl_test_dointvec_single_greater_int_max: sysctl_test_dointvec_single_greater_int_max passed
+	ok 8 - sysctl_test_dointvec_single_greater_int_max
+kunit sysctl_test: all tests passed
+ok 1 - sysctl_test
+	# Subtest: example
+	1..2
+init_suite
+	# example_simple_test: initializing
+	# example_simple_test: example_simple_test passed
+	ok 1 - example_simple_test
+	# example_mock_test: initializing
+	# example_mock_test: example_mock_test passed
+	ok 2 - example_mock_test
+kunit example: all tests passed
+ok 2 - example
diff --git a/tools/testing/kunit/test_data/test_is_test_passed-crash.log b/tools/testing/kunit/test_data/test_is_test_passed-crash.log
new file mode 100644
index 0000000000000..0b249870c8be4
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-crash.log
@@ -0,0 +1,69 @@
+printk: console [tty0] enabled
+printk: console [mc-1] enabled
+TAP version 14
+	# Subtest: sysctl_test
+	1..8
+	# sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
+	ok 1 - sysctl_test_dointvec_null_tbl_data
+	# sysctl_test_dointvec_table_maxlen_unset: sysctl_test_dointvec_table_maxlen_unset passed
+	ok 2 - sysctl_test_dointvec_table_maxlen_unset
+	# sysctl_test_dointvec_table_len_is_zero: sysctl_test_dointvec_table_len_is_zero passed
+	ok 3 - sysctl_test_dointvec_table_len_is_zero
+	# sysctl_test_dointvec_table_read_but_position_set: sysctl_test_dointvec_table_read_but_position_set passed
+	ok 4 - sysctl_test_dointvec_table_read_but_position_set
+	# sysctl_test_dointvec_happy_single_positive: sysctl_test_dointvec_happy_single_positive passed
+	ok 5 - sysctl_test_dointvec_happy_single_positive
+	# sysctl_test_dointvec_happy_single_negative: sysctl_test_dointvec_happy_single_negative passed
+	ok 6 - sysctl_test_dointvec_happy_single_negative
+	# sysctl_test_dointvec_single_less_int_min: sysctl_test_dointvec_single_less_int_min passed
+	ok 7 - sysctl_test_dointvec_single_less_int_min
+	# sysctl_test_dointvec_single_greater_int_max: sysctl_test_dointvec_single_greater_int_max passed
+	ok 8 - sysctl_test_dointvec_single_greater_int_max
+kunit sysctl_test: all tests passed
+ok 1 - sysctl_test
+	# Subtest: example
+	1..2
+init_suite
+	# example_simple_test: initializing
+Stack:
+ 6016f7db 6f81bd30 6f81bdd0 60021450
+ 6024b0e8 60021440 60018bbe 16f81bdc0
+ 00000001 6f81bd30 6f81bd20 6f81bdd0
+Call Trace:
+ [<6016f7db>] ? kunit_try_run_case+0xab/0xf0
+ [<60021450>] ? set_signals+0x0/0x60
+ [<60021440>] ? get_signals+0x0/0x10
+ [<60018bbe>] ? kunit_um_run_try_catch+0x5e/0xc0
+ [<60021450>] ? set_signals+0x0/0x60
+ [<60021440>] ? get_signals+0x0/0x10
+ [<60018bb3>] ? kunit_um_run_try_catch+0x53/0xc0
+ [<6016f321>] ? kunit_run_case_catch_errors+0x121/0x1a0
+ [<60018b60>] ? kunit_um_run_try_catch+0x0/0xc0
+ [<600189e0>] ? kunit_um_throw+0x0/0x180
+ [<6016f730>] ? kunit_try_run_case+0x0/0xf0
+ [<6016f600>] ? kunit_catch_run_case+0x0/0x130
+ [<6016edd0>] ? kunit_vprintk+0x0/0x30
+ [<6016ece0>] ? kunit_fail+0x0/0x40
+ [<6016eca0>] ? kunit_abort+0x0/0x40
+ [<6016ed20>] ? kunit_printk_emit+0x0/0xb0
+ [<6016f200>] ? kunit_run_case_catch_errors+0x0/0x1a0
+ [<6016f46e>] ? kunit_run_tests+0xce/0x260
+ [<6005b390>] ? unregister_console+0x0/0x190
+ [<60175b70>] ? suite_kunit_initexample_test_suite+0x0/0x20
+ [<60001cbb>] ? do_one_initcall+0x0/0x197
+ [<60001d47>] ? do_one_initcall+0x8c/0x197
+ [<6005cd20>] ? irq_to_desc+0x0/0x30
+ [<60002005>] ? kernel_init_freeable+0x1b3/0x272
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<601c0086>] ? kernel_init+0x26/0x160
+ [<60014442>] ? new_thread_handler+0x82/0xc0
+
+	# example_simple_test: kunit test case crashed!
+	# example_simple_test: example_simple_test failed
+	not ok 1 - example_simple_test
+	# example_mock_test: initializing
+	# example_mock_test: example_mock_test passed
+	ok 2 - example_mock_test
+kunit example: one or more tests failed
+not ok 2 - example
+List of all partitions:
diff --git a/tools/testing/kunit/test_data/test_is_test_passed-failure.log b/tools/testing/kunit/test_data/test_is_test_passed-failure.log
new file mode 100644
index 0000000000000..2ed870b6de72f
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-failure.log
@@ -0,0 +1,36 @@
+TAP version 14
+	# Subtest: sysctl_test
+	1..8
+	# sysctl_test_dointvec_null_tbl_data: sysctl_test_dointvec_null_tbl_data passed
+	ok 1 - sysctl_test_dointvec_null_tbl_data
+	# sysctl_test_dointvec_table_maxlen_unset: sysctl_test_dointvec_table_maxlen_unset passed
+	ok 2 - sysctl_test_dointvec_table_maxlen_unset
+	# sysctl_test_dointvec_table_len_is_zero: sysctl_test_dointvec_table_len_is_zero passed
+	ok 3 - sysctl_test_dointvec_table_len_is_zero
+	# sysctl_test_dointvec_table_read_but_position_set: sysctl_test_dointvec_table_read_but_position_set passed
+	ok 4 - sysctl_test_dointvec_table_read_but_position_set
+	# sysctl_test_dointvec_happy_single_positive: sysctl_test_dointvec_happy_single_positive passed
+	ok 5 - sysctl_test_dointvec_happy_single_positive
+	# sysctl_test_dointvec_happy_single_negative: sysctl_test_dointvec_happy_single_negative passed
+	ok 6 - sysctl_test_dointvec_happy_single_negative
+	# sysctl_test_dointvec_single_less_int_min: sysctl_test_dointvec_single_less_int_min passed
+	ok 7 - sysctl_test_dointvec_single_less_int_min
+	# sysctl_test_dointvec_single_greater_int_max: sysctl_test_dointvec_single_greater_int_max passed
+	ok 8 - sysctl_test_dointvec_single_greater_int_max
+kunit sysctl_test: all tests passed
+ok 1 - sysctl_test
+	# Subtest: example
+	1..2
+init_suite
+	# example_simple_test: initializing
+	# example_simple_test: EXPECTATION FAILED at kunit/example-test.c:30
+	Expected 1 + 1 == 3, but
+		1 + 1 == 2
+		3 == 3
+	# example_simple_test: example_simple_test failed
+	not ok 1 - example_simple_test
+	# example_mock_test: initializing
+	# example_mock_test: example_mock_test passed
+	ok 2 - example_mock_test
+kunit example: one or more tests failed
+not ok 2 - example
diff --git a/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log
new file mode 100644
index 0000000000000..ba69f5c94b75f
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_is_test_passed-no_tests_run.log
@@ -0,0 +1,75 @@
+Core dump limits :
+	soft - 0
+	hard - NONE
+Checking environment variables for a tempdir...none found
+Checking if /dev/shm is on tmpfs...OK
+Checking PROT_EXEC mmap in /dev/shm...OK
+Adding 24743936 bytes to physical memory to account for exec-shield gap
+Linux version 4.12.0-rc3-00010-g7319eb35f493-dirty (brendanhiggins@mactruck.svl.corp.google.com) (gcc version 7.3.0 (Debian 7.3.0-5) ) #29 Thu Mar 15 14:57:19 PDT 2018
+Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 14038
+Kernel command line: root=98:0
+PID hash table entries: 256 (order: -1, 2048 bytes)
+Dentry cache hash table entries: 8192 (order: 4, 65536 bytes)
+Inode-cache hash table entries: 4096 (order: 3, 32768 bytes)
+Memory: 27868K/56932K available (1681K kernel code, 480K rwdata, 400K rodata, 89K init, 205K bss, 29064K reserved, 0K cma-reserved)
+SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
+NR_IRQS:15
+clocksource: timer: mask: 0xffffffffffffffff max_cycles: 0x1cd42e205, max_idle_ns: 881590404426 ns
+Calibrating delay loop... 7384.26 BogoMIPS (lpj=36921344)
+pid_max: default: 32768 minimum: 301
+Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
+Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes)
+Checking that host ptys support output SIGIO...Yes
+Checking that host ptys support SIGIO on close...No, enabling workaround
+Using 2.6 host AIO
+clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
+futex hash table entries: 256 (order: 0, 6144 bytes)
+clocksource: Switched to clocksource timer
+console [stderr0] disabled
+mconsole (version 2) initialized on /usr/local/google/home/brendanhiggins/.uml/6Ijecl/mconsole
+Checking host MADV_REMOVE support...OK
+workingset: timestamp_bits=62 max_order=13 bucket_order=0
+Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
+io scheduler noop registered
+io scheduler deadline registered
+io scheduler cfq registered (default)
+io scheduler mq-deadline registered
+io scheduler kyber registered
+Initialized stdio console driver
+Using a channel type which is configured out of UML
+setup_one_line failed for device 1 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 2 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 3 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 4 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 5 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 6 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 7 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 8 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 9 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 10 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 11 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 12 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 13 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 14 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 15 : Configuration failed
+Console initialized on /dev/tty0
+console [tty0] enabled
+console [mc-1] enabled
+List of all partitions:
+No filesystem could mount root, tried:
+
+Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(98,0)
diff --git a/tools/testing/kunit/test_data/test_output_isolated_correctly.log b/tools/testing/kunit/test_data/test_output_isolated_correctly.log
new file mode 100644
index 0000000000000..94a6b3aeaa922
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_output_isolated_correctly.log
@@ -0,0 +1,106 @@
+Linux version 5.1.0-rc7-00061-g04652f1cb4aa0 (brendanhiggins@mactruck.svl.corp.google.com) (gcc version 7.3.0 (Debian 7.3.0-18)) #163 Wed May 8 16:18:20 PDT 2019
+Built 1 zonelists, mobility grouping on.  Total pages: 69906
+Kernel command line: mem=256M root=98:0
+Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
+Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
+Memory: 254468K/283500K available (1734K kernel code, 489K rwdata, 396K rodata, 85K init, 216K bss, 29032K reserved, 0K cma-reserved)
+SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
+NR_IRQS: 15
+clocksource: timer: mask: 0xffffffffffffffff max_cycles: 0x1cd42e205, max_idle_ns: 881590404426 ns
+------------[ cut here ]------------
+WARNING: CPU: 0 PID: 0 at kernel/time/clockevents.c:458 clockevents_register_device+0x143/0x160
+posix-timer cpumask == cpu_all_mask, using cpu_possible_mask instead
+CPU: 0 PID: 0 Comm: swapper Not tainted 5.1.0-rc7-00061-g04652f1cb4aa0 #163
+Stack:
+ 6005cc00 60233e18 60233e60 60233e18
+ 60233e60 00000009 00000000 6002a1b4
+ 1ca00000000 60071c23 60233e78 100000000000062
+Call Trace:
+ [<600214c5>] ? os_is_signal_stack+0x15/0x30
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<6001597e>] ? show_stack+0xbe/0x1c0
+ [<6005cc00>] ? __printk_safe_exit+0x0/0x40
+ [<6002a1b4>] ? __warn+0x144/0x170
+ [<60071c23>] ? clockevents_register_device+0x143/0x160
+ [<60021440>] ? get_signals+0x0/0x10
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<6002a27b>] ? warn_slowpath_fmt+0x9b/0xb0
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<6002a1e0>] ? warn_slowpath_fmt+0x0/0xb0
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<60021440>] ? get_signals+0x0/0x10
+ [<600213f0>] ? block_signals+0x0/0x20
+ [<60071c23>] ? clockevents_register_device+0x143/0x160
+ [<60021440>] ? get_signals+0x0/0x10
+ [<600213f0>] ? block_signals+0x0/0x20
+ [<6005c5ec>] ? printk+0x0/0x9b
+ [<60001bc8>] ? start_kernel+0x477/0x56a
+ [<600036f1>] ? start_kernel_proc+0x46/0x4d
+ [<60014442>] ? new_thread_handler+0x82/0xc0
+
+random: get_random_bytes called from print_oops_end_marker+0x4c/0x60 with crng_init=0
+---[ end trace c83434852b3702d3 ]---
+Calibrating delay loop... 6958.28 BogoMIPS (lpj=34791424)
+pid_max: default: 32768 minimum: 301
+Mount-cache hash table entries: 1024 (order: 1, 8192 bytes)
+Mountpoint-cache hash table entries: 1024 (order: 1, 8192 bytes)
+*** VALIDATE proc ***
+Checking that host ptys support output SIGIO...Yes
+Checking that host ptys support SIGIO on close...No, enabling workaround
+clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
+futex hash table entries: 256 (order: 0, 6144 bytes)
+clocksource: Switched to clocksource timer
+printk: console [stderr0] disabled
+mconsole (version 2) initialized on /usr/local/google/home/brendanhiggins/.uml/VZ2qMm/mconsole
+Checking host MADV_REMOVE support...OK
+workingset: timestamp_bits=62 max_order=16 bucket_order=0
+Block layer SCSI generic (bsg) driver version 0.4 loaded (major 254)
+io scheduler mq-deadline registered
+io scheduler kyber registered
+Initialized stdio console driver
+Using a channel type which is configured out of UML
+setup_one_line failed for device 1 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 2 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 3 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 4 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 5 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 6 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 7 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 8 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 9 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 10 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 11 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 12 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 13 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 14 : Configuration failed
+Using a channel type which is configured out of UML
+setup_one_line failed for device 15 : Configuration failed
+Console initialized on /dev/tty0
+printk: console [tty0] enabled
+printk: console [mc-1] enabled
+TAP version 14
+	# Subtest: example
+	1..2
+init_suite
+	# example_simple_test: initializing
+	# example_simple_test: example_simple_test passed
+	ok 1 - example_simple_test
+	# example_mock_test: initializing
+	# example_mock_test: example_mock_test passed
+	ok 2 - example_mock_test
+kunit example: all tests passed
+ok 1 - example
+List of all partitions:
diff --git a/tools/testing/kunit/test_data/test_read_from_file.kconfig b/tools/testing/kunit/test_data/test_read_from_file.kconfig
new file mode 100644
index 0000000000000..d2a4928ac773b
--- /dev/null
+++ b/tools/testing/kunit/test_data/test_read_from_file.kconfig
@@ -0,0 +1,17 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# User Mode Linux/x86 4.12.0-rc3 Kernel Configuration
+#
+CONFIG_UML=y
+CONFIG_MMU=y
+
+#
+# UML-specific options
+#
+
+#
+# Host processor type and features
+#
+# CONFIG_MK8 is not set
+CONFIG_TEST=y
+CONFIG_EXAMPLE_TEST=y
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 13/18] kunit: tool: add Python wrappers for running KUnit tests

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:16)
> From: Felix Guo <felixguoxiuping@gmail.com>
> 
> The ultimate goal is to create minimal isolated test binaries; in the
> meantime we are using UML to provide the infrastructure to run tests, so
> define an abstract way to configure and run tests that allow us to
> change the context in which tests are built without affecting the user.
> This also makes pretty and dynamic error reporting, and a lot of other
> nice features easier.
> 
> kunit_config.py:
>   - parse .config and Kconfig files.
> 
> kunit_kernel.py: provides helper functions to:
>   - configure the kernel using kunitconfig.
>   - build the kernel with the appropriate configuration.
>   - provide function to invoke the kernel and stream the output back.
> 
> kunit_parser.py: parses raw logs returned out by kunit_kernel and
> displays them in a user friendly way.
> 
> test_data/*: samples of test data for testing kunit.py, kunit_config.py,
> etc.
> 
> Signed-off-by: Felix Guo <felixguoxiuping@gmail.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

I look forward to the single binary solution, but until then, we have
this.

[PATCH v12 14/18] kunit: defconfig: add defconfigs for building KUnit tests

[Brendan Higgins]

Add defconfig for UML and a fragment that can be used to configure other
architectures for building KUnit tests. Add option to kunit_tool to use
a defconfig to create the kunitconfig.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 arch/um/configs/kunit_defconfig              |  8 ++++++
 tools/testing/kunit/configs/all_tests.config |  8 ++++++
 tools/testing/kunit/kunit.py                 | 28 +++++++++++++++++---
 tools/testing/kunit/kunit_kernel.py          |  3 ++-
 4 files changed, 42 insertions(+), 5 deletions(-)
 create mode 100644 arch/um/configs/kunit_defconfig
 create mode 100644 tools/testing/kunit/configs/all_tests.config

diff --git a/arch/um/configs/kunit_defconfig b/arch/um/configs/kunit_defconfig
new file mode 100644
index 0000000000000..bfe49689038f1
--- /dev/null
+++ b/arch/um/configs/kunit_defconfig
@@ -0,0 +1,8 @@
+CONFIG_OF=y
+CONFIG_OF_UNITTEST=y
+CONFIG_OF_OVERLAY=y
+CONFIG_I2C=y
+CONFIG_I2C_MUX=y
+CONFIG_KUNIT=y
+CONFIG_KUNIT_TEST=y
+CONFIG_KUNIT_EXAMPLE_TEST=y
diff --git a/tools/testing/kunit/configs/all_tests.config b/tools/testing/kunit/configs/all_tests.config
new file mode 100644
index 0000000000000..bfe49689038f1
--- /dev/null
+++ b/tools/testing/kunit/configs/all_tests.config
@@ -0,0 +1,8 @@
+CONFIG_OF=y
+CONFIG_OF_UNITTEST=y
+CONFIG_OF_OVERLAY=y
+CONFIG_I2C=y
+CONFIG_I2C_MUX=y
+CONFIG_KUNIT=y
+CONFIG_KUNIT_TEST=y
+CONFIG_KUNIT_EXAMPLE_TEST=y
diff --git a/tools/testing/kunit/kunit.py b/tools/testing/kunit/kunit.py
index da11bd62a4b82..0944dea5c3211 100755
--- a/tools/testing/kunit/kunit.py
+++ b/tools/testing/kunit/kunit.py
@@ -11,6 +11,7 @@ import argparse
 import sys
 import os
 import time
+import shutil
 
 from collections import namedtuple
 from enum import Enum, auto
@@ -21,7 +22,7 @@ import kunit_parser
 
 KunitResult = namedtuple('KunitResult', ['status','result'])
 
-KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs', 'build_dir'])
+KunitRequest = namedtuple('KunitRequest', ['raw_output','timeout', 'jobs', 'build_dir', 'defconfig'])
 
 class KunitStatus(Enum):
 	SUCCESS = auto()
@@ -29,8 +30,16 @@ class KunitStatus(Enum):
 	BUILD_FAILURE = auto()
 	TEST_FAILURE = auto()
 
+def create_default_kunitconfig():
+	if not os.path.exists(kunit_kernel.KUNITCONFIG_PATH):
+		shutil.copyfile('arch/um/configs/kunit_defconfig',
+				kunit_kernel.KUNITCONFIG_PATH)
+
 def run_tests(linux: kunit_kernel.LinuxSourceTree,
 	      request: KunitRequest) -> KunitResult:
+	if request.defconfig:
+		create_default_kunitconfig()
+
 	config_start = time.time()
 	success = linux.build_reconfig(request.build_dir)
 	config_end = time.time()
@@ -72,7 +81,7 @@ def run_tests(linux: kunit_kernel.LinuxSourceTree,
 	else:
 		return KunitResult(KunitStatus.SUCCESS, test_result)
 
-def main(argv, linux):
+def main(argv, linux=None):
 	parser = argparse.ArgumentParser(
 			description='Helps writing and running KUnit tests.')
 	subparser = parser.add_subparsers(dest='subcommand')
@@ -99,13 +108,24 @@ def main(argv, linux):
 				'directory.',
 				type=str, default=None, metavar='build_dir')
 
+	run_parser.add_argument('--defconfig',
+				help='Uses a default kunitconfig.',
+				action='store_true')
+
 	cli_args = parser.parse_args(argv)
 
 	if cli_args.subcommand == 'run':
+		if cli_args.defconfig:
+			create_default_kunitconfig()
+
+		if not linux:
+			linux = kunit_kernel.LinuxSourceTree()
+
 		request = KunitRequest(cli_args.raw_output,
 				       cli_args.timeout,
 				       cli_args.jobs,
-				       cli_args.build_dir)
+				       cli_args.build_dir,
+				       cli_args.defconfig)
 		result = run_tests(linux, request)
 		if result.status != KunitStatus.SUCCESS:
 			sys.exit(1)
@@ -113,4 +133,4 @@ def main(argv, linux):
 		parser.print_help()
 
 if __name__ == '__main__':
-	main(sys.argv[1:], kunit_kernel.LinuxSourceTree())
+	main(sys.argv[1:])
diff --git a/tools/testing/kunit/kunit_kernel.py b/tools/testing/kunit/kunit_kernel.py
index 07c0abf2f47df..bf38768353313 100644
--- a/tools/testing/kunit/kunit_kernel.py
+++ b/tools/testing/kunit/kunit_kernel.py
@@ -14,6 +14,7 @@ import os
 import kunit_config
 
 KCONFIG_PATH = '.config'
+KUNITCONFIG_PATH = 'kunitconfig'
 
 class ConfigError(Exception):
 	"""Represents an error trying to configure the Linux kernel."""
@@ -81,7 +82,7 @@ class LinuxSourceTree(object):
 
 	def __init__(self):
 		self._kconfig = kunit_config.Kconfig()
-		self._kconfig.read_from_file('kunitconfig')
+		self._kconfig.read_from_file(KUNITCONFIG_PATH)
 		self._ops = LinuxSourceTreeOperations()
 
 	def clean(self):
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 14/18] kunit: defconfig: add defconfigs for building KUnit tests

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:17)
> diff --git a/arch/um/configs/kunit_defconfig b/arch/um/configs/kunit_defconfig
> new file mode 100644
> index 0000000000000..bfe49689038f1
> --- /dev/null
> +++ b/arch/um/configs/kunit_defconfig
> @@ -0,0 +1,8 @@
> +CONFIG_OF=y
> +CONFIG_OF_UNITTEST=y
> +CONFIG_OF_OVERLAY=y
> +CONFIG_I2C=y
> +CONFIG_I2C_MUX=y
> +CONFIG_KUNIT=y
> +CONFIG_KUNIT_TEST=y
> +CONFIG_KUNIT_EXAMPLE_TEST=y
> diff --git a/tools/testing/kunit/configs/all_tests.config b/tools/testing/kunit/configs/all_tests.config
> new file mode 100644
> index 0000000000000..bfe49689038f1
> --- /dev/null
> +++ b/tools/testing/kunit/configs/all_tests.config
> @@ -0,0 +1,8 @@
> +CONFIG_OF=y
> +CONFIG_OF_UNITTEST=y
> +CONFIG_OF_OVERLAY=y
> +CONFIG_I2C=y
> +CONFIG_I2C_MUX=y

Are these above config options necessary? I don't think they're part of
the patch series anymore so it looks odd to enable the OF unittests and
i2c configs.

> +CONFIG_KUNIT=y
> +CONFIG_KUNIT_TEST=y
> +CONFIG_KUNIT_EXAMPLE_TEST=y

Re: [PATCH v12 14/18] kunit: defconfig: add defconfigs for building KUnit tests

[Brendan Higgins]

On Mon, Aug 12, 2019 at 9:39 PM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-08-12 11:24:17)
> > diff --git a/arch/um/configs/kunit_defconfig b/arch/um/configs/kunit_defconfig
> > new file mode 100644
> > index 0000000000000..bfe49689038f1
> > --- /dev/null
> > +++ b/arch/um/configs/kunit_defconfig
> > @@ -0,0 +1,8 @@
> > +CONFIG_OF=y
> > +CONFIG_OF_UNITTEST=y
> > +CONFIG_OF_OVERLAY=y
> > +CONFIG_I2C=y
> > +CONFIG_I2C_MUX=y
> > +CONFIG_KUNIT=y
> > +CONFIG_KUNIT_TEST=y
> > +CONFIG_KUNIT_EXAMPLE_TEST=y
> > diff --git a/tools/testing/kunit/configs/all_tests.config b/tools/testing/kunit/configs/all_tests.config
> > new file mode 100644
> > index 0000000000000..bfe49689038f1
> > --- /dev/null
> > +++ b/tools/testing/kunit/configs/all_tests.config
> > @@ -0,0 +1,8 @@
> > +CONFIG_OF=y
> > +CONFIG_OF_UNITTEST=y
> > +CONFIG_OF_OVERLAY=y
> > +CONFIG_I2C=y
> > +CONFIG_I2C_MUX=y
>
> Are these above config options necessary? I don't think they're part of
> the patch series anymore so it looks odd to enable the OF unittests and
> i2c configs.

Oh whoops, I forgot that we dropped the OF_UNITTEST from this
patchset. Will fix.

> > +CONFIG_KUNIT=y
> > +CONFIG_KUNIT_TEST=y
> > +CONFIG_KUNIT_EXAMPLE_TEST=y

[PATCH v12 15/18] Documentation: kunit: add documentation for KUnit

[Brendan Higgins]

Add documentation for KUnit, the Linux kernel unit testing framework.
- Add intro and usage guide for KUnit
- Add API reference

Signed-off-by: Felix Guo <felixguoxiuping@gmail.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 Documentation/dev-tools/index.rst           |   1 +
 Documentation/dev-tools/kunit/api/index.rst |  16 +
 Documentation/dev-tools/kunit/api/test.rst  |  14 +
 Documentation/dev-tools/kunit/faq.rst       |  62 +++
 Documentation/dev-tools/kunit/index.rst     |  79 +++
 Documentation/dev-tools/kunit/start.rst     | 180 ++++++
 Documentation/dev-tools/kunit/usage.rst     | 576 ++++++++++++++++++++
 7 files changed, 928 insertions(+)
 create mode 100644 Documentation/dev-tools/kunit/api/index.rst
 create mode 100644 Documentation/dev-tools/kunit/api/test.rst
 create mode 100644 Documentation/dev-tools/kunit/faq.rst
 create mode 100644 Documentation/dev-tools/kunit/index.rst
 create mode 100644 Documentation/dev-tools/kunit/start.rst
 create mode 100644 Documentation/dev-tools/kunit/usage.rst

diff --git a/Documentation/dev-tools/index.rst b/Documentation/dev-tools/index.rst
index b0522a4dd1073..09dee10d25928 100644
--- a/Documentation/dev-tools/index.rst
+++ b/Documentation/dev-tools/index.rst
@@ -24,6 +24,7 @@ whole; patches welcome!
    gdb-kernel-debugging
    kgdb
    kselftest
+   kunit/index
 
 
 .. only::  subproject and html
diff --git a/Documentation/dev-tools/kunit/api/index.rst b/Documentation/dev-tools/kunit/api/index.rst
new file mode 100644
index 0000000000000..9b9bffe5d41a0
--- /dev/null
+++ b/Documentation/dev-tools/kunit/api/index.rst
@@ -0,0 +1,16 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=============
+API Reference
+=============
+.. toctree::
+
+	test
+
+This section documents the KUnit kernel testing API. It is divided into the
+following sections:
+
+================================= ==============================================
+:doc:`test`                       documents all of the standard testing API
+                                  excluding mocking or mocking related features.
+================================= ==============================================
diff --git a/Documentation/dev-tools/kunit/api/test.rst b/Documentation/dev-tools/kunit/api/test.rst
new file mode 100644
index 0000000000000..d0ce19b1e1185
--- /dev/null
+++ b/Documentation/dev-tools/kunit/api/test.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+========
+Test API
+========
+
+This file documents all of the standard testing API excluding mocking or mocking
+related features.
+
+.. kernel-doc:: include/kunit/test.h
+   :internal:
+
+.. kernel-doc:: include/kunit/kunit-stream.h
+   :internal:
diff --git a/Documentation/dev-tools/kunit/faq.rst b/Documentation/dev-tools/kunit/faq.rst
new file mode 100644
index 0000000000000..bf2095112d899
--- /dev/null
+++ b/Documentation/dev-tools/kunit/faq.rst
@@ -0,0 +1,62 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+Frequently Asked Questions
+==========================
+
+How is this different from Autotest, kselftest, etc?
+====================================================
+KUnit is a unit testing framework. Autotest, kselftest (and some others) are
+not.
+
+A `unit test <https://martinfowler.com/bliki/UnitTest.html>`_ is supposed to
+test a single unit of code in isolation, hence the name. A unit test should be
+the finest granularity of testing and as such should allow all possible code
+paths to be tested in the code under test; this is only possible if the code
+under test is very small and does not have any external dependencies outside of
+the test's control like hardware.
+
+There are no testing frameworks currently available for the kernel that do not
+require installing the kernel on a test machine or in a VM and all require
+tests to be written in userspace and run on the kernel under test; this is true
+for Autotest, kselftest, and some others, disqualifying any of them from being
+considered unit testing frameworks.
+
+Does KUnit support running on architectures other than UML?
+===========================================================
+
+Yes, well, mostly.
+
+For the most part, the KUnit core framework (what you use to write the tests)
+can compile to any architecture; it compiles like just another part of the
+kernel and runs when the kernel boots. However, there is some infrastructure,
+like the KUnit Wrapper (``tools/testing/kunit/kunit.py``) that does not support
+other architectures.
+
+In short, this means that, yes, you can run KUnit on other architectures, but
+it might require more work than using KUnit on UML.
+
+For more information, see :ref:`kunit-on-non-uml`.
+
+What is the difference between a unit test and these other kinds of tests?
+==========================================================================
+Most existing tests for the Linux kernel would be categorized as an integration
+test, or an end-to-end test.
+
+- A unit test is supposed to test a single unit of code in isolation, hence the
+  name. A unit test should be the finest granularity of testing and as such
+  should allow all possible code paths to be tested in the code under test; this
+  is only possible if the code under test is very small and does not have any
+  external dependencies outside of the test's control like hardware.
+- An integration test tests the interaction between a minimal set of components,
+  usually just two or three. For example, someone might write an integration
+  test to test the interaction between a driver and a piece of hardware, or to
+  test the interaction between the userspace libraries the kernel provides and
+  the kernel itself; however, one of these tests would probably not test the
+  entire kernel along with hardware interactions and interactions with the
+  userspace.
+- An end-to-end test usually tests the entire system from the perspective of the
+  code under test. For example, someone might write an end-to-end test for the
+  kernel by installing a production configuration of the kernel on production
+  hardware with a production userspace and then trying to exercise some behavior
+  that depends on interactions between the hardware, the kernel, and userspace.
diff --git a/Documentation/dev-tools/kunit/index.rst b/Documentation/dev-tools/kunit/index.rst
new file mode 100644
index 0000000000000..a317ab45bfe2d
--- /dev/null
+++ b/Documentation/dev-tools/kunit/index.rst
@@ -0,0 +1,79 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========================================
+KUnit - Unit Testing for the Linux Kernel
+=========================================
+
+.. toctree::
+	:maxdepth: 2
+
+	start
+	usage
+	api/index
+	faq
+
+What is KUnit?
+==============
+
+KUnit is a lightweight unit testing and mocking framework for the Linux kernel.
+These tests are able to be run locally on a developer's workstation without a VM
+or special hardware.
+
+KUnit is heavily inspired by JUnit, Python's unittest.mock, and
+Googletest/Googlemock for C++. KUnit provides facilities for defining unit test
+cases, grouping related test cases into test suites, providing common
+infrastructure for running tests, and much more.
+
+Get started now: :doc:`start`
+
+Why KUnit?
+==========
+
+A unit test is supposed to test a single unit of code in isolation, hence the
+name. A unit test should be the finest granularity of testing and as such should
+allow all possible code paths to be tested in the code under test; this is only
+possible if the code under test is very small and does not have any external
+dependencies outside of the test's control like hardware.
+
+Outside of KUnit, there are no testing frameworks currently
+available for the kernel that do not require installing the kernel on a test
+machine or in a VM and all require tests to be written in userspace running on
+the kernel; this is true for Autotest, and kselftest, disqualifying
+any of them from being considered unit testing frameworks.
+
+KUnit addresses the problem of being able to run tests without needing a virtual
+machine or actual hardware with User Mode Linux. User Mode Linux is a Linux
+architecture, like ARM or x86; however, unlike other architectures it compiles
+to a standalone program that can be run like any other program directly inside
+of a host operating system; to be clear, it does not require any virtualization
+support; it is just a regular program.
+
+KUnit is fast. Excluding build time, from invocation to completion KUnit can run
+several dozen tests in only 10 to 20 seconds; this might not sound like a big
+deal to some people, but having such fast and easy to run tests fundamentally
+changes the way you go about testing and even writing code in the first place.
+Linus himself said in his `git talk at Google
+<https://gist.github.com/lorn/1272686/revisions#diff-53c65572127855f1b003db4064a94573R874>`_:
+
+	"... a lot of people seem to think that performance is about doing the
+	same thing, just doing it faster, and that is not true. That is not what
+	performance is all about. If you can do something really fast, really
+	well, people will start using it differently."
+
+In this context Linus was talking about branching and merging,
+but this point also applies to testing. If your tests are slow, unreliable, are
+difficult to write, and require a special setup or special hardware to run,
+then you wait a lot longer to write tests, and you wait a lot longer to run
+tests; this means that tests are likely to break, unlikely to test a lot of
+things, and are unlikely to be rerun once they pass. If your tests are really
+fast, you run them all the time, every time you make a change, and every time
+someone sends you some code. Why trust that someone ran all their tests
+correctly on every change when you can just run them yourself in less time than
+it takes to read his / her test log?
+
+How do I use it?
+================
+
+*   :doc:`start` - for new users of KUnit
+*   :doc:`usage` - for a more detailed explanation of KUnit features
+*   :doc:`api/index` - for the list of KUnit APIs used for testing
diff --git a/Documentation/dev-tools/kunit/start.rst b/Documentation/dev-tools/kunit/start.rst
new file mode 100644
index 0000000000000..6dc229e46bb34
--- /dev/null
+++ b/Documentation/dev-tools/kunit/start.rst
@@ -0,0 +1,180 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+Getting Started
+===============
+
+Installing dependencies
+=======================
+KUnit has the same dependencies as the Linux kernel. As long as you can build
+the kernel, you can run KUnit.
+
+KUnit Wrapper
+=============
+Included with KUnit is a simple Python wrapper that helps format the output to
+easily use and read KUnit output. It handles building and running the kernel, as
+well as formatting the output.
+
+The wrapper can be run with:
+
+.. code-block:: bash
+
+   ./tools/testing/kunit/kunit.py run
+
+Creating a kunitconfig
+======================
+The Python script is a thin wrapper around Kbuild as such, it needs to be
+configured with a ``kunitconfig`` file. This file essentially contains the
+regular Kernel config, with the specific test targets as well.
+
+.. code-block:: bash
+
+	git clone -b master https://kunit.googlesource.com/kunitconfig $PATH_TO_KUNITCONFIG_REPO
+	cd $PATH_TO_LINUX_REPO
+	ln -s $PATH_TO_KUNIT_CONFIG_REPO/kunitconfig kunitconfig
+
+You may want to add kunitconfig to your local gitignore.
+
+Verifying KUnit Works
+---------------------
+
+To make sure that everything is set up correctly, simply invoke the Python
+wrapper from your kernel repo:
+
+.. code-block:: bash
+
+	./tools/testing/kunit/kunit.py
+
+.. note::
+   You may want to run ``make mrproper`` first.
+
+If everything worked correctly, you should see the following:
+
+.. code-block:: bash
+
+	Generating .config ...
+	Building KUnit Kernel ...
+	Starting KUnit Kernel ...
+
+followed by a list of tests that are run. All of them should be passing.
+
+.. note::
+   Because it is building a lot of sources for the first time, the ``Building
+   kunit kernel`` step may take a while.
+
+Writing your first test
+=======================
+
+In your kernel repo let's add some code that we can test. Create a file
+``drivers/misc/example.h`` with the contents:
+
+.. code-block:: c
+
+	int misc_example_add(int left, int right);
+
+create a file ``drivers/misc/example.c``:
+
+.. code-block:: c
+
+	#include <linux/errno.h>
+
+	#include "example.h"
+
+	int misc_example_add(int left, int right)
+	{
+		return left + right;
+	}
+
+Now add the following lines to ``drivers/misc/Kconfig``:
+
+.. code-block:: kconfig
+
+	config MISC_EXAMPLE
+		bool "My example"
+
+and the following lines to ``drivers/misc/Makefile``:
+
+.. code-block:: make
+
+	obj-$(CONFIG_MISC_EXAMPLE) += example.o
+
+Now we are ready to write the test. The test will be in
+``drivers/misc/example-test.c``:
+
+.. code-block:: c
+
+	#include <kunit/test.h>
+	#include "example.h"
+
+	/* Define the test cases. */
+
+	static void misc_example_add_test_basic(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, 1, misc_example_add(1, 0));
+		KUNIT_EXPECT_EQ(test, 2, misc_example_add(1, 1));
+		KUNIT_EXPECT_EQ(test, 0, misc_example_add(-1, 1));
+		KUNIT_EXPECT_EQ(test, INT_MAX, misc_example_add(0, INT_MAX));
+		KUNIT_EXPECT_EQ(test, -1, misc_example_add(INT_MAX, INT_MIN));
+	}
+
+	static void misc_example_test_failure(struct kunit *test)
+	{
+		KUNIT_FAIL(test, "This test never passes.");
+	}
+
+	static struct kunit_case misc_example_test_cases[] = {
+		KUNIT_CASE(misc_example_add_test_basic),
+		KUNIT_CASE(misc_example_test_failure),
+		{}
+	};
+
+	static struct kunit_suite misc_example_test_suite = {
+		.name = "misc-example",
+		.test_cases = misc_example_test_cases,
+	};
+	kunit_test_suite(misc_example_test_suite);
+
+Now add the following to ``drivers/misc/Kconfig``:
+
+.. code-block:: kconfig
+
+	config MISC_EXAMPLE_TEST
+		bool "Test for my example"
+		depends on MISC_EXAMPLE && KUNIT
+
+and the following to ``drivers/misc/Makefile``:
+
+.. code-block:: make
+
+	obj-$(CONFIG_MISC_EXAMPLE_TEST) += example-test.o
+
+Now add it to your ``kunitconfig``:
+
+.. code-block:: none
+
+	CONFIG_MISC_EXAMPLE=y
+	CONFIG_MISC_EXAMPLE_TEST=y
+
+Now you can run the test:
+
+.. code-block:: bash
+
+	./tools/testing/kunit/kunit.py
+
+You should see the following failure:
+
+.. code-block:: none
+
+	...
+	[16:08:57] [PASSED] misc-example:misc_example_add_test_basic
+	[16:08:57] [FAILED] misc-example:misc_example_test_failure
+	[16:08:57] EXPECTATION FAILED at drivers/misc/example-test.c:17
+	[16:08:57] 	This test never passes.
+	...
+
+Congrats! You just wrote your first KUnit test!
+
+Next Steps
+==========
+*   Check out the :doc:`usage` page for a more
+    in-depth explanation of KUnit.
diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst
new file mode 100644
index 0000000000000..c6e69634e274b
--- /dev/null
+++ b/Documentation/dev-tools/kunit/usage.rst
@@ -0,0 +1,576 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===========
+Using KUnit
+===========
+
+The purpose of this document is to describe what KUnit is, how it works, how it
+is intended to be used, and all the concepts and terminology that are needed to
+understand it. This guide assumes a working knowledge of the Linux kernel and
+some basic knowledge of testing.
+
+For a high level introduction to KUnit, including setting up KUnit for your
+project, see :doc:`start`.
+
+Organization of this document
+=============================
+
+This document is organized into two main sections: Testing and Isolating
+Behavior. The first covers what a unit test is and how to use KUnit to write
+them. The second covers how to use KUnit to isolate code and make it possible
+to unit test code that was otherwise un-unit-testable.
+
+Testing
+=======
+
+What is KUnit?
+--------------
+
+"K" is short for "kernel" so "KUnit" is the "(Linux) Kernel Unit Testing
+Framework." KUnit is intended first and foremost for writing unit tests; it is
+general enough that it can be used to write integration tests; however, this is
+a secondary goal. KUnit has no ambition of being the only testing framework for
+the kernel; for example, it does not intend to be an end-to-end testing
+framework.
+
+What is Unit Testing?
+---------------------
+
+A `unit test <https://martinfowler.com/bliki/UnitTest.html>`_ is a test that
+tests code at the smallest possible scope, a *unit* of code. In the C
+programming language that's a function.
+
+Unit tests should be written for all the publicly exposed functions in a
+compilation unit; so that is all the functions that are exported in either a
+*class* (defined below) or all functions which are **not** static.
+
+Writing Tests
+-------------
+
+Test Cases
+~~~~~~~~~~
+
+The fundamental unit in KUnit is the test case. A test case is a function with
+the signature ``void (*)(struct kunit *test)``. It calls a function to be tested
+and then sets *expectations* for what should happen. For example:
+
+.. code-block:: c
+
+	void example_test_success(struct kunit *test)
+	{
+	}
+
+	void example_test_failure(struct kunit *test)
+	{
+		KUNIT_FAIL(test, "This test never passes.");
+	}
+
+In the above example ``example_test_success`` always passes because it does
+nothing; no expectations are set, so all expectations pass. On the other hand
+``example_test_failure`` always fails because it calls ``KUNIT_FAIL``, which is
+a special expectation that logs a message and causes the test case to fail.
+
+Expectations
+~~~~~~~~~~~~
+An *expectation* is a way to specify that you expect a piece of code to do
+something in a test. An expectation is called like a function. A test is made
+by setting expectations about the behavior of a piece of code under test; when
+one or more of the expectations fail, the test case fails and information about
+the failure is logged. For example:
+
+.. code-block:: c
+
+	void add_test_basic(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, 1, add(1, 0));
+		KUNIT_EXPECT_EQ(test, 2, add(1, 1));
+	}
+
+In the above example ``add_test_basic`` makes a number of assertions about the
+behavior of a function called ``add``; the first parameter is always of type
+``struct kunit *``, which contains information about the current test context;
+the second parameter, in this case, is what the value is expected to be; the
+last value is what the value actually is. If ``add`` passes all of these
+expectations, the test case, ``add_test_basic`` will pass; if any one of these
+expectations fail, the test case will fail.
+
+It is important to understand that a test case *fails* when any expectation is
+violated; however, the test will continue running, potentially trying other
+expectations until the test case ends or is otherwise terminated. This is as
+opposed to *assertions* which are discussed later.
+
+To learn about more expectations supported by KUnit, see :doc:`api/test`.
+
+.. note::
+   A single test case should be pretty short, pretty easy to understand,
+   focused on a single behavior.
+
+For example, if we wanted to properly test the add function above, we would
+create additional tests cases which would each test a different property that an
+add function should have like this:
+
+.. code-block:: c
+
+	void add_test_basic(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, 1, add(1, 0));
+		KUNIT_EXPECT_EQ(test, 2, add(1, 1));
+	}
+
+	void add_test_negative(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, 0, add(-1, 1));
+	}
+
+	void add_test_max(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, INT_MAX, add(0, INT_MAX));
+		KUNIT_EXPECT_EQ(test, -1, add(INT_MAX, INT_MIN));
+	}
+
+	void add_test_overflow(struct kunit *test)
+	{
+		KUNIT_EXPECT_EQ(test, INT_MIN, add(INT_MAX, 1));
+	}
+
+Notice how it is immediately obvious what all the properties that we are testing
+for are.
+
+Assertions
+~~~~~~~~~~
+
+KUnit also has the concept of an *assertion*. An assertion is just like an
+expectation except the assertion immediately terminates the test case if it is
+not satisfied.
+
+For example:
+
+.. code-block:: c
+
+	static void mock_test_do_expect_default_return(struct kunit *test)
+	{
+		struct mock_test_context *ctx = test->priv;
+		struct mock *mock = ctx->mock;
+		int param0 = 5, param1 = -5;
+		const char *two_param_types[] = {"int", "int"};
+		const void *two_params[] = {&param0, &param1};
+		const void *ret;
+
+		ret = mock->do_expect(mock,
+				      "test_printk", test_printk,
+				      two_param_types, two_params,
+				      ARRAY_SIZE(two_params));
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret);
+		KUNIT_EXPECT_EQ(test, -4, *((int *) ret));
+	}
+
+In this example, the method under test should return a pointer to a value, so
+if the pointer returned by the method is null or an errno, we don't want to
+bother continuing the test since the following expectation could crash the test
+case. `ASSERT_NOT_ERR_OR_NULL(...)` allows us to bail out of the test case if
+the appropriate conditions have not been satisfied to complete the test.
+
+Test Suites
+~~~~~~~~~~~
+
+Now obviously one unit test isn't very helpful; the power comes from having
+many test cases covering all of your behaviors. Consequently it is common to
+have many *similar* tests; in order to reduce duplication in these closely
+related tests most unit testing frameworks provide the concept of a *test
+suite*, in KUnit we call it a *test suite*; all it is is just a collection of
+test cases for a unit of code with a set up function that gets invoked before
+every test cases and then a tear down function that gets invoked after every
+test case completes.
+
+Example:
+
+.. code-block:: c
+
+	static struct kunit_case example_test_cases[] = {
+		KUNIT_CASE(example_test_foo),
+		KUNIT_CASE(example_test_bar),
+		KUNIT_CASE(example_test_baz),
+		{}
+	};
+
+	static struct kunit_suite example_test_suite = {
+		.name = "example",
+		.init = example_test_init,
+		.exit = example_test_exit,
+		.test_cases = example_test_cases,
+	};
+	kunit_test_suite(example_test_suite);
+
+In the above example the test suite, ``example_test_suite``, would run the test
+cases ``example_test_foo``, ``example_test_bar``, and ``example_test_baz``,
+each would have ``example_test_init`` called immediately before it and would
+have ``example_test_exit`` called immediately after it.
+``kunit_test_suite(example_test_suite)`` registers the test suite with the
+KUnit test framework.
+
+.. note::
+   A test case will only be run if it is associated with a test suite.
+
+For a more information on these types of things see the :doc:`api/test`.
+
+Isolating Behavior
+==================
+
+The most important aspect of unit testing that other forms of testing do not
+provide is the ability to limit the amount of code under test to a single unit.
+In practice, this is only possible by being able to control what code gets run
+when the unit under test calls a function and this is usually accomplished
+through some sort of indirection where a function is exposed as part of an API
+such that the definition of that function can be changed without affecting the
+rest of the code base. In the kernel this primarily comes from two constructs,
+classes, structs that contain function pointers that are provided by the
+implementer, and architecture specific functions which have definitions selected
+at compile time.
+
+Classes
+-------
+
+Classes are not a construct that is built into the C programming language;
+however, it is an easily derived concept. Accordingly, pretty much every project
+that does not use a standardized object oriented library (like GNOME's GObject)
+has their own slightly different way of doing object oriented programming; the
+Linux kernel is no exception.
+
+The central concept in kernel object oriented programming is the class. In the
+kernel, a *class* is a struct that contains function pointers. This creates a
+contract between *implementers* and *users* since it forces them to use the
+same function signature without having to call the function directly. In order
+for it to truly be a class, the function pointers must specify that a pointer
+to the class, known as a *class handle*, be one of the parameters; this makes
+it possible for the member functions (also known as *methods*) to have access
+to member variables (more commonly known as *fields*) allowing the same
+implementation to have multiple *instances*.
+
+Typically a class can be *overridden* by *child classes* by embedding the
+*parent class* in the child class. Then when a method provided by the child
+class is called, the child implementation knows that the pointer passed to it is
+of a parent contained within the child; because of this, the child can compute
+the pointer to itself because the pointer to the parent is always a fixed offset
+from the pointer to the child; this offset is the offset of the parent contained
+in the child struct. For example:
+
+.. code-block:: c
+
+	struct shape {
+		int (*area)(struct shape *this);
+	};
+
+	struct rectangle {
+		struct shape parent;
+		int length;
+		int width;
+	};
+
+	int rectangle_area(struct shape *this)
+	{
+		struct rectangle *self = container_of(this, struct shape, parent);
+
+		return self->length * self->width;
+	};
+
+	void rectangle_new(struct rectangle *self, int length, int width)
+	{
+		self->parent.area = rectangle_area;
+		self->length = length;
+		self->width = width;
+	}
+
+In this example (as in most kernel code) the operation of computing the pointer
+to the child from the pointer to the parent is done by ``container_of``.
+
+Faking Classes
+~~~~~~~~~~~~~~
+
+In order to unit test a piece of code that calls a method in a class, the
+behavior of the method must be controllable, otherwise the test ceases to be a
+unit test and becomes an integration test.
+
+A fake just provides an implementation of a piece of code that is different than
+what runs in a production instance, but behaves identically from the standpoint
+of the callers; this is usually done to replace a dependency that is hard to
+deal with, or is slow.
+
+A good example for this might be implementing a fake EEPROM that just stores the
+"contents" in an internal buffer. For example, let's assume we have a class that
+represents an EEPROM:
+
+.. code-block:: c
+
+	struct eeprom {
+		ssize_t (*read)(struct eeprom *this, size_t offset, char *buffer, size_t count);
+		ssize_t (*write)(struct eeprom *this, size_t offset, const char *buffer, size_t count);
+	};
+
+And we want to test some code that buffers writes to the EEPROM:
+
+.. code-block:: c
+
+	struct eeprom_buffer {
+		ssize_t (*write)(struct eeprom_buffer *this, const char *buffer, size_t count);
+		int flush(struct eeprom_buffer *this);
+		size_t flush_count; /* Flushes when buffer exceeds flush_count. */
+	};
+
+	struct eeprom_buffer *new_eeprom_buffer(struct eeprom *eeprom);
+	void destroy_eeprom_buffer(struct eeprom *eeprom);
+
+We can easily test this code by *faking out* the underlying EEPROM:
+
+.. code-block:: c
+
+	struct fake_eeprom {
+		struct eeprom parent;
+		char contents[FAKE_EEPROM_CONTENTS_SIZE];
+	};
+
+	ssize_t fake_eeprom_read(struct eeprom *parent, size_t offset, char *buffer, size_t count)
+	{
+		struct fake_eeprom *this = container_of(parent, struct fake_eeprom, parent);
+
+		count = min(count, FAKE_EEPROM_CONTENTS_SIZE - offset);
+		memcpy(buffer, this->contents + offset, count);
+
+		return count;
+	}
+
+	ssize_t fake_eeprom_write(struct eeprom *this, size_t offset, const char *buffer, size_t count)
+	{
+		struct fake_eeprom *this = container_of(parent, struct fake_eeprom, parent);
+
+		count = min(count, FAKE_EEPROM_CONTENTS_SIZE - offset);
+		memcpy(this->contents + offset, buffer, count);
+
+		return count;
+	}
+
+	void fake_eeprom_init(struct fake_eeprom *this)
+	{
+		this->parent.read = fake_eeprom_read;
+		this->parent.write = fake_eeprom_write;
+		memset(this->contents, 0, FAKE_EEPROM_CONTENTS_SIZE);
+	}
+
+We can now use it to test ``struct eeprom_buffer``:
+
+.. code-block:: c
+
+	struct eeprom_buffer_test {
+		struct fake_eeprom *fake_eeprom;
+		struct eeprom_buffer *eeprom_buffer;
+	};
+
+	static void eeprom_buffer_test_does_not_write_until_flush(struct kunit *test)
+	{
+		struct eeprom_buffer_test *ctx = test->priv;
+		struct eeprom_buffer *eeprom_buffer = ctx->eeprom_buffer;
+		struct fake_eeprom *fake_eeprom = ctx->fake_eeprom;
+		char buffer[] = {0xff};
+
+		eeprom_buffer->flush_count = SIZE_MAX;
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 1);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0);
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 1);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[1], 0);
+
+		eeprom_buffer->flush(eeprom_buffer);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0xff);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[1], 0xff);
+	}
+
+	static void eeprom_buffer_test_flushes_after_flush_count_met(struct kunit *test)
+	{
+		struct eeprom_buffer_test *ctx = test->priv;
+		struct eeprom_buffer *eeprom_buffer = ctx->eeprom_buffer;
+		struct fake_eeprom *fake_eeprom = ctx->fake_eeprom;
+		char buffer[] = {0xff};
+
+		eeprom_buffer->flush_count = 2;
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 1);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0);
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 1);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0xff);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[1], 0xff);
+	}
+
+	static void eeprom_buffer_test_flushes_increments_of_flush_count(struct kunit *test)
+	{
+		struct eeprom_buffer_test *ctx = test->priv;
+		struct eeprom_buffer *eeprom_buffer = ctx->eeprom_buffer;
+		struct fake_eeprom *fake_eeprom = ctx->fake_eeprom;
+		char buffer[] = {0xff, 0xff};
+
+		eeprom_buffer->flush_count = 2;
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 1);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0);
+
+		eeprom_buffer->write(eeprom_buffer, buffer, 2);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[0], 0xff);
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[1], 0xff);
+		/* Should have only flushed the first two bytes. */
+		KUNIT_EXPECT_EQ(test, fake_eeprom->contents[2], 0);
+	}
+
+	static int eeprom_buffer_test_init(struct kunit *test)
+	{
+		struct eeprom_buffer_test *ctx;
+
+		ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+		ctx->fake_eeprom = kunit_kzalloc(test, sizeof(*ctx->fake_eeprom), GFP_KERNEL);
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->fake_eeprom);
+		fake_eeprom_init(ctx->fake_eeprom);
+
+		ctx->eeprom_buffer = new_eeprom_buffer(&ctx->fake_eeprom->parent);
+		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->eeprom_buffer);
+
+		test->priv = ctx;
+
+		return 0;
+	}
+
+	static void eeprom_buffer_test_exit(struct kunit *test)
+	{
+		struct eeprom_buffer_test *ctx = test->priv;
+
+		destroy_eeprom_buffer(ctx->eeprom_buffer);
+	}
+
+.. _kunit-on-non-uml:
+
+KUnit on non-UML architectures
+==============================
+
+By default KUnit uses UML as a way to provide dependencies for code under test.
+Under most circumstances KUnit's usage of UML should be treated as an
+implementation detail of how KUnit works under the hood. Nevertheless, there
+are instances where being able to run architecture specific code, or test
+against real hardware is desirable. For these reasons KUnit supports running on
+other architectures.
+
+Running existing KUnit tests on non-UML architectures
+-----------------------------------------------------
+
+There are some special considerations when running existing KUnit tests on
+non-UML architectures:
+
+*   Hardware may not be deterministic, so a test that always passes or fails
+    when run under UML may not always do so on real hardware.
+*   Hardware and VM environments may not be hermetic. KUnit tries its best to
+    provide a hermetic environment to run tests; however, it cannot manage state
+    that it doesn't know about outside of the kernel. Consequently, tests that
+    may be hermetic on UML may not be hermetic on other architectures.
+*   Some features and tooling may not be supported outside of UML.
+*   Hardware and VMs are slower than UML.
+
+None of these are reasons not to run your KUnit tests on real hardware; they are
+only things to be aware of when doing so.
+
+The biggest impediment will likely be that certain KUnit features and
+infrastructure may not support your target environment. For example, at this
+time the KUnit Wrapper (``tools/testing/kunit/kunit.py``) does not work outside
+of UML. Unfortunately, there is no way around this. Using UML (or even just a
+particular architecture) allows us to make a lot of assumptions that make it
+possible to do things which might otherwise be impossible.
+
+Nevertheless, all core KUnit framework features are fully supported on all
+architectures, and using them is straightforward: all you need to do is to take
+your kunitconfig, your Kconfig options for the tests you would like to run, and
+merge them into whatever config your are using for your platform. That's it!
+
+For example, let's say you have the following kunitconfig:
+
+.. code-block:: none
+
+	CONFIG_KUNIT=y
+	CONFIG_KUNIT_EXAMPLE_TEST=y
+
+If you wanted to run this test on an x86 VM, you might add the following config
+options to your ``.config``:
+
+.. code-block:: none
+
+	CONFIG_KUNIT=y
+	CONFIG_KUNIT_EXAMPLE_TEST=y
+	CONFIG_SERIAL_8250=y
+	CONFIG_SERIAL_8250_CONSOLE=y
+
+All these new options do is enable support for a common serial console needed
+for logging.
+
+Next, you could build a kernel with these tests as follows:
+
+
+.. code-block:: bash
+
+	make ARCH=x86 olddefconfig
+	make ARCH=x86
+
+Once you have built a kernel, you could run it on QEMU as follows:
+
+.. code-block:: bash
+
+	qemu-system-x86_64 -enable-kvm \
+			   -m 1024 \
+			   -kernel arch/x86_64/boot/bzImage \
+			   -append 'console=ttyS0' \
+			   --nographic
+
+Interspersed in the kernel logs you might see the following:
+
+.. code-block:: none
+
+	TAP version 14
+		# Subtest: example
+		1..1
+		# example_simple_test: initializing
+		ok 1 - example_simple_test
+	ok 1 - example
+
+Congratulations, you just ran a KUnit test on the x86 architecture!
+
+Writing new tests for other architectures
+-----------------------------------------
+
+The first thing you must do is ask yourself whether it is necessary to write a
+KUnit test for a specific architecture, and then whether it is necessary to
+write that test for a particular piece of hardware. In general, writing a test
+that depends on having access to a particular piece of hardware or software (not
+included in the Linux source repo) should be avoided at all costs.
+
+Even if you only ever plan on running your KUnit test on your hardware
+configuration, other people may want to run your tests and may not have access
+to your hardware. If you write your test to run on UML, then anyone can run your
+tests without knowing anything about your particular setup, and you can still
+run your tests on your hardware setup just by compiling for your architecture.
+
+.. important::
+   Always prefer tests that run on UML to tests that only run under a particular
+   architecture, and always prefer tests that run under QEMU or another easy
+   (and monitarily free) to obtain software environment to a specific piece of
+   hardware.
+
+Nevertheless, there are still valid reasons to write an architecture or hardware
+specific test: for example, you might want to test some code that really belongs
+in ``arch/some-arch/*``. Even so, try your best to write the test so that it
+does not depend on physical hardware: if some of your test cases don't need the
+hardware, only require the hardware for tests that actually need it.
+
+Now that you have narrowed down exactly what bits are hardware specific, the
+actual procedure for writing and running the tests is pretty much the same as
+writing normal KUnit tests. One special caveat is that you have to reset
+hardware state in between test cases; if this is not possible, you may only be
+able to run one test case per invocation.
+
+.. TODO(brendanhiggins@google.com): Add an actual example of an architecture
+   dependent KUnit test.
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 15/18] Documentation: kunit: add documentation for KUnit

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:18)
> Add documentation for KUnit, the Linux kernel unit testing framework.
> - Add intro and usage guide for KUnit
> - Add API reference
> 
> Signed-off-by: Felix Guo <felixguoxiuping@gmail.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

[PATCH v12 16/18] MAINTAINERS: add entry for KUnit the unit testing framework

[Brendan Higgins]

Add myself as maintainer of KUnit, the Linux kernel's unit testing
framework.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
 MAINTAINERS | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index a2c343ee3b2ca..f0bd77e8a8a2f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8799,6 +8799,17 @@ S:	Maintained
 F:	tools/testing/selftests/
 F:	Documentation/dev-tools/kselftest*
 
+KERNEL UNIT TESTING FRAMEWORK (KUnit)
+M:	Brendan Higgins <brendanhiggins@google.com>
+L:	linux-kselftest@vger.kernel.org
+L:	kunit-dev@googlegroups.com
+W:	https://google.github.io/kunit-docs/third_party/kernel/docs/
+S:	Maintained
+F:	Documentation/dev-tools/kunit/
+F:	include/kunit/
+F:	kunit/
+F:	tools/testing/kunit/
+
 KERNEL USERMODE HELPER
 M:	Luis Chamberlain <mcgrof@kernel.org>
 L:	linux-kernel@vger.kernel.org
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 16/18] MAINTAINERS: add entry for KUnit the unit testing framework

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:19)
> Add myself as maintainer of KUnit, the Linux kernel's unit testing
> framework.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

[PATCH v12 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()

[Brendan Higgins]

From: Iurii Zaikin <yzaikin@google.com>

KUnit tests for initialized data behavior of proc_dointvec that is
explicitly checked in the code. Includes basic parsing tests including
int min/max overflow.

Signed-off-by: Iurii Zaikin <yzaikin@google.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
---
 kernel/Makefile      |   2 +
 kernel/sysctl-test.c | 392 +++++++++++++++++++++++++++++++++++++++++++
 lib/Kconfig.debug    |  11 ++
 3 files changed, 405 insertions(+)
 create mode 100644 kernel/sysctl-test.c

diff --git a/kernel/Makefile b/kernel/Makefile
index ef0d95a190b41..63e9ea6122c2c 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -113,6 +113,8 @@ obj-$(CONFIG_TORTURE_TEST) += torture.o
 obj-$(CONFIG_HAS_IOMEM) += iomem.o
 obj-$(CONFIG_RSEQ) += rseq.o
 
+obj-$(CONFIG_SYSCTL_KUNIT_TEST) += sysctl-test.o
+
 obj-$(CONFIG_GCC_PLUGIN_STACKLEAK) += stackleak.o
 KASAN_SANITIZE_stackleak.o := n
 KCOV_INSTRUMENT_stackleak.o := n
diff --git a/kernel/sysctl-test.c b/kernel/sysctl-test.c
new file mode 100644
index 0000000000000..2a63241a8453b
--- /dev/null
+++ b/kernel/sysctl-test.c
@@ -0,0 +1,392 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test of proc sysctl.
+ */
+
+#include <kunit/test.h>
+#include <linux/sysctl.h>
+
+#define KUNIT_PROC_READ 0
+#define KUNIT_PROC_WRITE 1
+
+static int i_zero;
+static int i_one_hundred = 100;
+
+/*
+ * Test that proc_dointvec will not try to use a NULL .data field even when the
+ * length is non-zero.
+ */
+static void sysctl_test_api_dointvec_null_tbl_data(struct kunit *test)
+{
+	struct ctl_table null_data_table = {
+		.procname = "foo",
+		/*
+		 * Here we are testing that proc_dointvec behaves correctly when
+		 * we give it a NULL .data field. Normally this would point to a
+		 * piece of memory where the value would be stored.
+		 */
+		.data		= NULL,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	/*
+	 * proc_dointvec expects a buffer in user space, so we allocate one. We
+	 * also need to cast it to __user so sparse doesn't get mad.
+	 */
+	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
+							   GFP_USER);
+	size_t len;
+	loff_t pos;
+
+	/*
+	 * We don't care what the starting length is since proc_dointvec should
+	 * not try to read because .data is NULL.
+	 */
+	len = 1234;
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
+					       KUNIT_PROC_READ, buffer, &len,
+					       &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+
+	/*
+	 * See above.
+	 */
+	len = 1234;
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&null_data_table,
+					       KUNIT_PROC_WRITE, buffer, &len,
+					       &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+}
+
+/*
+ * Similar to the previous test, we create a struct ctrl_table that has a .data
+ * field that proc_dointvec cannot do anything with; however, this time it is
+ * because we tell proc_dointvec that the size is 0.
+ */
+static void sysctl_test_api_dointvec_table_maxlen_unset(struct kunit *test)
+{
+	int data = 0;
+	struct ctl_table data_maxlen_unset_table = {
+		.procname = "foo",
+		.data		= &data,
+		/*
+		 * So .data is no longer NULL, but we tell proc_dointvec its
+		 * length is 0, so it still shouldn't try to use it.
+		 */
+		.maxlen		= 0,
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
+							   GFP_USER);
+	size_t len;
+	loff_t pos;
+
+	/*
+	 * As before, we don't care what buffer length is because proc_dointvec
+	 * cannot do anything because its internal .data buffer has zero length.
+	 */
+	len = 1234;
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
+					       KUNIT_PROC_READ, buffer, &len,
+					       &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+
+	/*
+	 * See previous comment.
+	 */
+	len = 1234;
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&data_maxlen_unset_table,
+					       KUNIT_PROC_WRITE, buffer, &len,
+					       &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+}
+
+/*
+ * Here we provide a valid struct ctl_table, but we try to read and write from
+ * it using a buffer of zero length, so it should still fail in a similar way as
+ * before.
+ */
+static void sysctl_test_api_dointvec_table_len_is_zero(struct kunit *test)
+{
+	int data = 0;
+	/* Good table. */
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
+							   GFP_USER);
+	/*
+	 * However, now our read/write buffer has zero length.
+	 */
+	size_t len = 0;
+	loff_t pos;
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
+					       &len, &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE, buffer,
+					       &len, &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+}
+
+/*
+ * Test that proc_dointvec refuses to read when the file position is non-zero.
+ */
+static void sysctl_test_api_dointvec_table_read_but_position_set(
+		struct kunit *test)
+{
+	int data = 0;
+	/* Good table. */
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	void __user *buffer = (void __user *)kunit_kzalloc(test, sizeof(int),
+							   GFP_USER);
+	/*
+	 * We don't care about our buffer length because we start off with a
+	 * non-zero file position.
+	 */
+	size_t len = 1234;
+	/*
+	 * proc_dointvec should refuse to read into the buffer since the file
+	 * pos is non-zero.
+	 */
+	loff_t pos = 1;
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ, buffer,
+					       &len, &pos));
+	KUNIT_EXPECT_EQ(test, (size_t)0, len);
+}
+
+/*
+ * Test that we can read a two digit number in a sufficiently size buffer.
+ * Nothing fancy.
+ */
+static void sysctl_test_dointvec_read_happy_single_positive(struct kunit *test)
+{
+	int data = 0;
+	/* Good table. */
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	size_t len = 4;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+	/* Store 13 in the data field. */
+	*((int *)table.data) = 13;
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
+					       user_buffer, &len, &pos));
+	KUNIT_ASSERT_EQ(test, (size_t)3, len);
+	buffer[len] = '\0';
+	/* And we read 13 back out. */
+	KUNIT_EXPECT_STREQ(test, "13\n", buffer);
+}
+
+/*
+ * Same as previous test, just now with negative numbers.
+ */
+static void sysctl_test_dointvec_read_happy_single_negative(struct kunit *test)
+{
+	int data = 0;
+	/* Good table. */
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	size_t len = 5;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+	*((int *)table.data) = -16;
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_READ,
+					       user_buffer, &len, &pos));
+	KUNIT_ASSERT_EQ(test, (size_t)4, len);
+	buffer[len] = '\0';
+	KUNIT_EXPECT_STREQ(test, "-16\n", (char *)buffer);
+}
+
+/*
+ * Test that a simple positive write works.
+ */
+static void sysctl_test_dointvec_write_happy_single_positive(struct kunit *test)
+{
+	int data = 0;
+	/* Good table. */
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	char input[] = "9";
+	size_t len = sizeof(input) - 1;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+
+	memcpy(buffer, input, len);
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
+					       user_buffer, &len, &pos));
+	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
+	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
+	KUNIT_EXPECT_EQ(test, 9, *((int *)table.data));
+}
+
+/*
+ * Same as previous test, but now with negative numbers.
+ */
+static void sysctl_test_dointvec_write_happy_single_negative(struct kunit *test)
+{
+	int data = 0;
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	char input[] = "-9";
+	size_t len = sizeof(input) - 1;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+
+	memcpy(buffer, input, len);
+
+	KUNIT_EXPECT_EQ(test, 0, proc_dointvec(&table, KUNIT_PROC_WRITE,
+					       user_buffer, &len, &pos));
+	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len);
+	KUNIT_EXPECT_EQ(test, sizeof(input) - 1, (size_t)pos);
+	KUNIT_EXPECT_EQ(test, -9, *((int *)table.data));
+}
+
+/*
+ * Test that writing a value smaller than the minimum possible value is not
+ * allowed.
+ */
+static void sysctl_test_api_dointvec_write_single_less_int_min(
+		struct kunit *test)
+{
+	int data = 0;
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	size_t max_len = 32, len = max_len;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+	unsigned long abs_of_less_than_min = (unsigned long)INT_MAX
+					     - (INT_MAX + INT_MIN) + 1;
+
+	/*
+	 * We use this rigmarole to create a string that contains a value one
+	 * less than the minimum accepted value.
+	 */
+	KUNIT_ASSERT_LT(test,
+			(size_t)snprintf(buffer, max_len, "-%lu",
+					 abs_of_less_than_min),
+			max_len);
+
+	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
+						     user_buffer, &len, &pos));
+	KUNIT_EXPECT_EQ(test, max_len, len);
+	KUNIT_EXPECT_EQ(test, 0, *((int *)table.data));
+}
+
+/*
+ * Test that writing the maximum possible value works.
+ */
+static void sysctl_test_api_dointvec_write_single_greater_int_max(
+		struct kunit *test)
+{
+	int data = 0;
+	struct ctl_table table = {
+		.procname = "foo",
+		.data		= &data,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+		.extra1		= &i_zero,
+		.extra2         = &i_one_hundred,
+	};
+	size_t max_len = 32, len = max_len;
+	loff_t pos = 0;
+	char *buffer = kunit_kzalloc(test, max_len, GFP_USER);
+	char __user *user_buffer = (char __user *)buffer;
+	unsigned long greater_than_max = (unsigned long)INT_MAX + 1;
+
+	KUNIT_ASSERT_GT(test, greater_than_max, (unsigned long)INT_MAX);
+	KUNIT_ASSERT_LT(test, (size_t)snprintf(buffer, max_len, "%lu",
+					       greater_than_max),
+			max_len);
+	KUNIT_EXPECT_EQ(test, -EINVAL, proc_dointvec(&table, KUNIT_PROC_WRITE,
+						     user_buffer, &len, &pos));
+	KUNIT_ASSERT_EQ(test, max_len, len);
+	KUNIT_EXPECT_EQ(test, 0, *((int *)table.data));
+}
+
+static struct kunit_case sysctl_test_cases[] = {
+	KUNIT_CASE(sysctl_test_api_dointvec_null_tbl_data),
+	KUNIT_CASE(sysctl_test_api_dointvec_table_maxlen_unset),
+	KUNIT_CASE(sysctl_test_api_dointvec_table_len_is_zero),
+	KUNIT_CASE(sysctl_test_api_dointvec_table_read_but_position_set),
+	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_positive),
+	KUNIT_CASE(sysctl_test_dointvec_read_happy_single_negative),
+	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_positive),
+	KUNIT_CASE(sysctl_test_dointvec_write_happy_single_negative),
+	KUNIT_CASE(sysctl_test_api_dointvec_write_single_less_int_min),
+	KUNIT_CASE(sysctl_test_api_dointvec_write_single_greater_int_max),
+	{}
+};
+
+static struct kunit_suite sysctl_test_suite = {
+	.name = "sysctl_test",
+	.test_cases = sysctl_test_cases,
+};
+
+kunit_test_suite(sysctl_test_suite);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5960e2980a8a0..a425741907b0d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1965,6 +1965,17 @@ config TEST_SYSCTL
 
 	  If unsure, say N.
 
+config SYSCTL_KUNIT_TEST
+	bool "KUnit test for sysctl"
+	depends on KUNIT
+	help
+	  This builds the proc sysctl unit test, which runs on boot.
+	  Tests the API contract and implementation correctness of sysctl.
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
+
 config TEST_UDELAY
 	tristate "udelay test driver"
 	help
-- 
2.23.0.rc1.153.gdeed80330f-goog

Re: [PATCH v12 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()

[Stephen Boyd]

Quoting Brendan Higgins (2019-08-12 11:24:20)
> From: Iurii Zaikin <yzaikin@google.com>
> 
> KUnit tests for initialized data behavior of proc_dointvec that is
> explicitly checked in the code. Includes basic parsing tests including
> int min/max overflow.
> 
> Signed-off-by: Iurii Zaikin <yzaikin@google.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
> Acked-by: Luis Chamberlain <mcgrof@kernel.org>
> ---

Reviewed-by: Stephen Boyd <sboyd@kernel.org>

[PATCH v12 18/18] MAINTAINERS: add proc sysctl KUnit test to PROC SYSCTL section

[Brendan Higgins]

Add entry for the new proc sysctl KUnit test to the PROC SYSCTL section,
and add Iurii as a maintainer.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
---
 MAINTAINERS | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index f0bd77e8a8a2f..0cac78807137b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12965,12 +12965,14 @@ F:	Documentation/filesystems/proc.txt
 PROC SYSCTL
 M:	Luis Chamberlain <mcgrof@kernel.org>
 M:	Kees Cook <keescook@chromium.org>
+M:	Iurii Zaikin <yzaikin@google.com>
 L:	linux-kernel@vger.kernel.org
 L:	linux-fsdevel@vger.kernel.org
 S:	Maintained
 F:	fs/proc/proc_sysctl.c
 F:	include/linux/sysctl.h
 F:	kernel/sysctl.c
+F:	kernel/sysctl-test.c
 F:	tools/testing/selftests/sysctl/
 
 PS3 NETWORK SUPPORT
-- 
2.23.0.rc1.153.gdeed80330f-goog