+ mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/damon/core-test: add a kunit test case for ops registration
has been added to the -mm tree.  Its filename is
     mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/core-test: add a kunit test case for ops registration

This commit adds a simple kunit test case for DAMON operations
registration feature.

Link: https://lkml.kernel.org/r/20220419122225.290518-1-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core-test.h |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

--- a/mm/damon/core-test.h~mm-damon-core-test-add-a-kunit-test-case-for-ops-registration
+++ a/mm/damon/core-test.h
@@ -232,6 +232,41 @@ static void damon_test_split_regions_of(
 	damon_destroy_ctx(c);
 }
 
+static void damon_test_ops_registration(struct kunit *test)
+{
+	struct damon_ctx *c = damon_new_ctx();
+	struct damon_operations ops, bak;
+
+	/* DAMON_OPS_{V,P}ADDR are registered on subsys_initcall */
+	KUNIT_EXPECT_EQ(test, damon_select_ops(c, DAMON_OPS_VADDR), 0);
+	KUNIT_EXPECT_EQ(test, damon_select_ops(c, DAMON_OPS_PADDR), 0);
+
+	/* Double-registration is prohibited */
+	ops.id = DAMON_OPS_VADDR;
+	KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), -EINVAL);
+	ops.id = DAMON_OPS_PADDR;
+	KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), -EINVAL);
+
+	/* Unknown ops id cannot be registered */
+	KUNIT_EXPECT_EQ(test, damon_select_ops(c, NR_DAMON_OPS), -EINVAL);
+
+	/* Registration should success after unregistration */
+	mutex_lock(&damon_ops_lock);
+	bak = damon_registered_ops[DAMON_OPS_VADDR];
+	damon_registered_ops[DAMON_OPS_VADDR] = (struct damon_operations){};
+	mutex_unlock(&damon_ops_lock);
+
+	ops.id = DAMON_OPS_VADDR;
+	KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), 0);
+
+	mutex_lock(&damon_ops_lock);
+	damon_registered_ops[DAMON_OPS_VADDR] = bak;
+	mutex_unlock(&damon_ops_lock);
+
+	/* Check double-registration failure again */
+	KUNIT_EXPECT_EQ(test, damon_register_ops(&ops), -EINVAL);
+}
+
 static struct kunit_case damon_test_cases[] = {
 	KUNIT_CASE(damon_test_target),
 	KUNIT_CASE(damon_test_regions),
@@ -240,6 +275,7 @@ static struct kunit_case damon_test_case
 	KUNIT_CASE(damon_test_merge_two),
 	KUNIT_CASE(damon_test_merge_regions_of),
 	KUNIT_CASE(damon_test_split_regions_of),
+	KUNIT_CASE(damon_test_ops_registration),
 	{},
 };
 
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-test-add-a-kunit-test-case-for-ops-registration.patch