[PATCH v2 0/2] of: unittest: add overlay gpio test to catch gpio hog problem

[PATCH v2 0/2] of: unittest: add overlay gpio test to catch gpio hog problem

[frowand.list]

From: Frank Rowand <frank.rowand@sony.com>

Geert reports that gpio hog nodes are not properly processed when
the gpio hog node is added via an overlay reply and provides an
patch to fix the problem [1].

Add a unittest that shows the problem.  Unittest will report "1 failed"
test before applying Geert's patch and "0 failed" after applying
Geert's patch.

I did not have a development system for which it would be easy to
experiment with applying an overlay containing a gpio hog, so I
instead created this unittest that uses a fake gpio node.

Some tests in the devicetree unittests result in printk messages
from the code being tested.  It can be difficult to determine
whether the messages are the result of unittest or are potentially
reporting bugs that should be fixed.  The most recent example of
a person asking whether to be concerned about these messages is [2].

Patch 2 adds annotations for all messages triggered by unittests,
except KERN_DEBUG messages.  (KERN_DEBUG is a special case due to the
possible interaction of CONFIG_DYNAMIC_DEBUG.)

The annotations added in patch 2/2 add a small amount of verbosity
to the console output.  I have created a proof of concept tool to
explore (1) how test harnesses could use the annotations and
(2) how to make the resulting console output easier to read and
understand as a human being.  The tool 'of_unittest_expect' is
available at https://github.com/frowand/dt_tools

The format of the annotations is expected to change when unittests
are converted to use the kunit infrastructure when the broader
testing community has an opportunity to discuss the implementation
of annotations of test triggered messages.

[1] https://lore.kernel.org/r/20200220130149.26283-1-geert+renesas@glider.be
[2] https://lore.kernel.org/r/6021ac63-b5e0-ed3d-f964-7c6ef579cd68@huawei.com


Frank Rowand (2):
  of: unittest: add overlay gpio test to catch gpio hog problem
  of: unittest: annotate warnings triggered by unittest

 drivers/of/unittest-data/Makefile             |   8 +-
 drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +
 drivers/of/unittest-data/overlay_gpio_02a.dts |  16 +
 drivers/of/unittest-data/overlay_gpio_02b.dts |  16 +
 drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +
 drivers/of/unittest-data/overlay_gpio_04a.dts |  16 +
 drivers/of/unittest-data/overlay_gpio_04b.dts |  16 +
 drivers/of/unittest.c                         | 628 ++++++++++++++++++++++++--
 8 files changed, 715 insertions(+), 31 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts

-- 
Frank Rowand <frank.rowand@sony.com>

[PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[frowand.list]

From: Frank Rowand <frank.rowand@sony.com>

Geert reports that gpio hog nodes are not properly processed when
the gpio hog node is added via an overlay reply and provides an
RFC patch to fix the problem [1].

Add a unittest that shows the problem.  Unittest will report "1 failed"
test before applying Geert's RFC patch and "0 failed" after applying
Geert's RFC patch.

[1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/

Signed-off-by: Frank Rowand <frank.rowand@sony.com>
---

changes since v1:
  - base on 5.6-rc1
  - fixed node names in overlays
  - removed unused fields from struct unittest_gpio_dev
  - of_unittest_overlay_gpio() cleaned up comments
  - of_unittest_overlay_gpio() moved saving global values into
    probe_pass_count and chip_request_count more tightly around
    test code expected to trigger changes in the global values

v1 of this patch incorrectly reported that it had made changes
since the RFC version, but it was mistakenly created from the
wrong branch.

There are checkpatch warnings.
  - New files are in a directory already covered by MAINTAINERS
  - The undocumented compatibles are restricted to use by unittest
    and should not be documented under Documentation
  - The printk() KERN_<LEVEL> warnings are false positives.  The level
    is supplied by a define parameter instead of a hard coded constant
  - The lines over 80 characters are consistent with unittest.c style

This unittest was also valuable in that it allowed me to explore
possible issues related to the proposed solution to the gpio hog
problem.


 drivers/of/unittest-data/Makefile             |   8 +-
 drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
 drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
 drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
 drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
 drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
 drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
 drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
 8 files changed, 370 insertions(+), 1 deletion(-)
 create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
 create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts

diff --git a/drivers/of/unittest-data/Makefile b/drivers/of/unittest-data/Makefile
index 9b6807065827..009f4045c8e4 100644
--- a/drivers/of/unittest-data/Makefile
+++ b/drivers/of/unittest-data/Makefile
@@ -21,7 +21,13 @@ obj-$(CONFIG_OF_OVERLAY) += overlay.dtb.o \
 			    overlay_bad_add_dup_prop.dtb.o \
 			    overlay_bad_phandle.dtb.o \
 			    overlay_bad_symbol.dtb.o \
-			    overlay_base.dtb.o
+			    overlay_base.dtb.o \
+			    overlay_gpio_01.dtb.o \
+			    overlay_gpio_02a.dtb.o \
+			    overlay_gpio_02b.dtb.o \
+			    overlay_gpio_03.dtb.o \
+			    overlay_gpio_04a.dtb.o \
+			    overlay_gpio_04b.dtb.o
 
 # enable creation of __symbols__ node
 DTC_FLAGS_overlay += -@
diff --git a/drivers/of/unittest-data/overlay_gpio_01.dts b/drivers/of/unittest-data/overlay_gpio_01.dts
new file mode 100644
index 000000000000..699ff104ae10
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_01.dts
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@0 {
+		compatible = "unittest-gpio";
+		reg = <0>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B";
+
+		line-b {
+			gpio-hog;
+			gpios = <2 0>;
+			input;
+			line-name = "line-B-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_02a.dts b/drivers/of/unittest-data/overlay_gpio_02a.dts
new file mode 100644
index 000000000000..ec59aff6ed47
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_02a.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@2 {
+		compatible = "unittest-gpio";
+		reg = <2>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B";
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_02b.dts b/drivers/of/unittest-data/overlay_gpio_02b.dts
new file mode 100644
index 000000000000..43ce111d41ce
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_02b.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@2 {
+		line-a {
+			gpio-hog;
+			gpios = <1 0>;
+			input;
+			line-name = "line-A-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_03.dts b/drivers/of/unittest-data/overlay_gpio_03.dts
new file mode 100644
index 000000000000..6e0312340a1b
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_03.dts
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@3 {
+		compatible = "unittest-gpio";
+		reg = <3>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B", "line-C", "line-D";
+
+		line-d {
+			gpio-hog;
+			gpios = <4 0>;
+			input;
+			line-name = "line-D-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_04a.dts b/drivers/of/unittest-data/overlay_gpio_04a.dts
new file mode 100644
index 000000000000..7b1e04ebfa7a
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_04a.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@4 {
+		compatible = "unittest-gpio";
+		reg = <4>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		ngpios = <2>;
+		gpio-line-names = "line-A", "line-B", "line-C", "line-D";
+	};
+};
diff --git a/drivers/of/unittest-data/overlay_gpio_04b.dts b/drivers/of/unittest-data/overlay_gpio_04b.dts
new file mode 100644
index 000000000000..a14e95c6699a
--- /dev/null
+++ b/drivers/of/unittest-data/overlay_gpio_04b.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+/plugin/;
+
+&unittest_test_bus {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	gpio@4 {
+		line-c {
+			gpio-hog;
+			gpios = <3 0>;
+			input;
+			line-name = "line-C-input";
+		};
+	};
+};
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 68b87587b2ef..6059bb363097 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -24,6 +24,7 @@
 
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
+#include <linux/gpio/driver.h>
 
 #include <linux/bitops.h>
 
@@ -46,6 +47,97 @@
 	failed; \
 })
 
+/*
+ * Expected message may have a message level other than KERN_INFO.
+ * Print the expected message only if the current loglevel will allow
+ * the actual message to print.
+ */
+#define EXPECT_BEGIN(level, fmt, ...) \
+	printk(level pr_fmt("EXPECT \\ : ") fmt, ##__VA_ARGS__)
+
+#define EXPECT_END(level, fmt, ...) \
+	printk(level pr_fmt("EXPECT / : ") fmt, ##__VA_ARGS__)
+
+struct unittest_gpio_dev {
+	struct gpio_chip chip;
+};
+
+static int unittest_gpio_chip_request_count;
+static int unittest_gpio_probe_count;
+static int unittest_gpio_probe_pass_count;
+
+static int unittest_gpio_chip_request(struct gpio_chip *chip, unsigned int offset)
+{
+	unittest_gpio_chip_request_count++;
+
+	pr_debug("%s(): %s %d %d\n", __func__, chip->label, offset,
+		 unittest_gpio_chip_request_count);
+	return 0;
+}
+
+static int unittest_gpio_probe(struct platform_device *pdev)
+{
+	struct unittest_gpio_dev *devptr;
+	int ret;
+
+	unittest_gpio_probe_count++;
+
+	devptr = kzalloc(sizeof(*devptr), GFP_KERNEL);
+	if (!devptr)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, devptr);
+
+	devptr->chip.of_node = pdev->dev.of_node;
+	devptr->chip.label = "of-unittest-gpio";
+	devptr->chip.base = -1; /* dynamic allocation */
+	devptr->chip.ngpio = 5;
+	devptr->chip.request = unittest_gpio_chip_request;
+
+	ret = gpiochip_add_data(&devptr->chip, NULL);
+
+	unittest(!ret,
+		 "gpiochip_add_data() for node @%pOF failed, ret = %d\n", devptr->chip.of_node, ret);
+
+	if (!ret)
+		unittest_gpio_probe_pass_count++;
+	return ret;
+}
+
+static int unittest_gpio_remove(struct platform_device *pdev)
+{
+	struct unittest_gpio_dev *gdev = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node;
+
+	dev_dbg(dev, "%s for node @%pOF\n", __func__, np);
+
+	if (!gdev)
+		return -EINVAL;
+
+	if (gdev->chip.base != -1)
+		gpiochip_remove(&gdev->chip);
+
+	platform_set_drvdata(pdev, NULL);
+	kfree(pdev);
+
+	return 0;
+}
+
+static const struct of_device_id unittest_gpio_id[] = {
+	{ .compatible = "unittest-gpio", },
+	{}
+};
+
+static struct platform_driver unittest_gpio_driver = {
+	.probe	= unittest_gpio_probe,
+	.remove	= unittest_gpio_remove,
+	.driver	= {
+		.name		= "unittest-gpio",
+		.of_match_table	= of_match_ptr(unittest_gpio_id),
+	},
+};
+
 static void __init of_unittest_find_node_by_name(void)
 {
 	struct device_node *np;
@@ -2183,6 +2275,153 @@ static inline void of_unittest_overlay_i2c_15(void) { }
 
 #endif
 
+static void __init of_unittest_overlay_gpio(void)
+{
+	int chip_request_count;
+	int probe_pass_count;
+	int ret;
+
+	/*
+	 * tests: apply overlays before registering driver
+	 * Similar to installing a driver as a module, the
+	 * driver is registered after applying the overlays.
+	 *
+	 * - apply overlay_gpio_01
+	 * - apply overlay_gpio_02a
+	 * - apply overlay_gpio_02b
+	 * - register driver
+	 *
+	 * register driver will result in
+	 *   - probe and processing gpio hog for overlay_gpio_01
+	 *   - probe for overlay_gpio_02a
+	 *   - processing gpio for overlay_gpio_02b
+	 */
+
+	probe_pass_count = unittest_gpio_probe_pass_count;
+	chip_request_count = unittest_gpio_chip_request_count;
+
+	/*
+	 * overlay_gpio_01 contains gpio node and child gpio hog node
+	 * overlay_gpio_02a contains gpio node
+	 * overlay_gpio_02b contains child gpio hog node
+	 */
+
+	unittest(overlay_data_apply("overlay_gpio_01", NULL),
+		 "Adding overlay 'overlay_gpio_01' failed\n");
+
+	unittest(overlay_data_apply("overlay_gpio_02a", NULL),
+		 "Adding overlay 'overlay_gpio_02a' failed\n");
+
+	unittest(overlay_data_apply("overlay_gpio_02b", NULL),
+		 "Adding overlay 'overlay_gpio_02b' failed\n");
+
+	/*
+	 * messages are the result of the probes, after the
+	 * driver is registered
+	 */
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "GPIO line <<int>> (line-B-input) hogged as input\n");
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "GPIO line <<int>> (line-A-input) hogged as input\n");
+
+	ret = platform_driver_register(&unittest_gpio_driver);
+	if (unittest(ret == 0, "could not register unittest gpio driver\n"))
+		return;
+
+	EXPECT_END(KERN_INFO,
+		   "GPIO line <<int>> (line-A-input) hogged as input\n");
+	EXPECT_END(KERN_INFO,
+		   "GPIO line <<int>> (line-B-input) hogged as input\n");
+
+	unittest(probe_pass_count + 2 == unittest_gpio_probe_pass_count,
+		 "unittest_gpio_probe() failed or not called\n");
+
+	unittest(chip_request_count + 2 == unittest_gpio_chip_request_count,
+		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
+		 unittest_gpio_chip_request_count - chip_request_count);
+
+	/*
+	 * tests: apply overlays after registering driver
+	 *
+	 * Similar to a driver built-in to the kernel, the
+	 * driver is registered before applying the overlays.
+	 *
+	 * overlay_gpio_03 contains gpio node and child gpio hog node
+	 *
+	 * - apply overlay_gpio_03
+	 *
+	 * apply overlay will result in
+	 *   - probe and processing gpio hog.
+	 */
+
+	probe_pass_count = unittest_gpio_probe_pass_count;
+	chip_request_count = unittest_gpio_chip_request_count;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "GPIO line <<int>> (line-D-input) hogged as input\n");
+
+	/* overlay_gpio_03 contains gpio node and child gpio hog node */
+
+	unittest(overlay_data_apply("overlay_gpio_03", NULL),
+		 "Adding overlay 'overlay_gpio_03' failed\n");
+
+	EXPECT_END(KERN_INFO,
+		   "GPIO line <<int>> (line-D-input) hogged as input\n");
+
+	unittest(probe_pass_count + 1 == unittest_gpio_probe_pass_count,
+		 "unittest_gpio_probe() failed or not called\n");
+
+	unittest(chip_request_count + 1 == unittest_gpio_chip_request_count,
+		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
+		 unittest_gpio_chip_request_count - chip_request_count);
+
+	/*
+	 * overlay_gpio_04a contains gpio node
+	 *
+	 * - apply overlay_gpio_04a
+	 *
+	 * apply the overlay will result in
+	 *   - probe for overlay_gpio_04a
+	 */
+
+	probe_pass_count = unittest_gpio_probe_pass_count;
+	chip_request_count = unittest_gpio_chip_request_count;
+
+	/* overlay_gpio_04a contains gpio node */
+
+	unittest(overlay_data_apply("overlay_gpio_04a", NULL),
+		 "Adding overlay 'overlay_gpio_04a' failed\n");
+
+	unittest(probe_pass_count + 1 == unittest_gpio_probe_pass_count,
+		 "unittest_gpio_probe() failed or not called\n");
+
+	/*
+	 * overlay_gpio_04b contains child gpio hog node
+	 *
+	 * - apply overlay_gpio_04b
+	 *
+	 * apply the overlay will result in
+	 *   - processing gpio for overlay_gpio_04b
+	 */
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "GPIO line <<int>> (line-C-input) hogged as input\n");
+
+	/* overlay_gpio_04b contains child gpio hog node */
+
+	unittest(overlay_data_apply("overlay_gpio_04b", NULL),
+		 "Adding overlay 'overlay_gpio_04b' failed\n");
+
+	EXPECT_END(KERN_INFO,
+		   "GPIO line <<int>> (line-C-input) hogged as input\n");
+
+	unittest(chip_request_count + 1 == unittest_gpio_chip_request_count,
+		 "unittest_gpio_chip_request() called %d times (expected 1 time)\n",
+		 unittest_gpio_chip_request_count - chip_request_count);
+}
+
 static void __init of_unittest_overlay(void)
 {
 	struct device_node *bus_np = NULL;
@@ -2242,6 +2481,8 @@ static void __init of_unittest_overlay(void)
 	of_unittest_overlay_i2c_cleanup();
 #endif
 
+	of_unittest_overlay_gpio();
+
 	of_unittest_destroy_tracked_overlays();
 
 out:
@@ -2295,6 +2536,12 @@ struct overlay_info {
 OVERLAY_INFO_EXTERN(overlay_12);
 OVERLAY_INFO_EXTERN(overlay_13);
 OVERLAY_INFO_EXTERN(overlay_15);
+OVERLAY_INFO_EXTERN(overlay_gpio_01);
+OVERLAY_INFO_EXTERN(overlay_gpio_02a);
+OVERLAY_INFO_EXTERN(overlay_gpio_02b);
+OVERLAY_INFO_EXTERN(overlay_gpio_03);
+OVERLAY_INFO_EXTERN(overlay_gpio_04a);
+OVERLAY_INFO_EXTERN(overlay_gpio_04b);
 OVERLAY_INFO_EXTERN(overlay_bad_add_dup_node);
 OVERLAY_INFO_EXTERN(overlay_bad_add_dup_prop);
 OVERLAY_INFO_EXTERN(overlay_bad_phandle);
@@ -2319,6 +2566,12 @@ struct overlay_info {
 	OVERLAY_INFO(overlay_12, 0),
 	OVERLAY_INFO(overlay_13, 0),
 	OVERLAY_INFO(overlay_15, 0),
+	OVERLAY_INFO(overlay_gpio_01, 0),
+	OVERLAY_INFO(overlay_gpio_02a, 0),
+	OVERLAY_INFO(overlay_gpio_02b, 0),
+	OVERLAY_INFO(overlay_gpio_03, 0),
+	OVERLAY_INFO(overlay_gpio_04a, 0),
+	OVERLAY_INFO(overlay_gpio_04b, 0),
 	OVERLAY_INFO(overlay_bad_add_dup_node, -EINVAL),
 	OVERLAY_INFO(overlay_bad_add_dup_prop, -EINVAL),
 	OVERLAY_INFO(overlay_bad_phandle, -EINVAL),
-- 
Frank Rowand <frank.rowand@sony.com>

[PATCH v2 2/2] of: unittest: annotate warnings triggered by unittest

[frowand.list]

From: Frank Rowand <frank.rowand@sony.com>

Some tests in the devicetree unittests result in printk messages
from the code being tested.  It can be difficult to determine
whether the messages are the result of unittest or are potentially
reporting bugs that should be fixed.  The most recent example of
a person asking whether to be concerned about these messages is [1].

Add annotations for all messages triggered by unittests, except
KERN_DEBUG messages.  (KERN_DEBUG is a special case due to the
possible interaction of CONFIG_DYNAMIC_DEBUG.)

The format of the annotations is expected to change when unittests
are converted to use the kunit infrastructure when the broader
testing community has an opportunity to discuss the implementation
of annotations of test triggered messages.

[1] https://lore.kernel.org/r/6021ac63-b5e0-ed3d-f964-7c6ef579cd68@huawei.com

Signed-off-by: Frank Rowand <frank.rowand@sony.com>
---
changes since v1:
  - none

 drivers/of/unittest.c | 375 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 345 insertions(+), 30 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 6059bb363097..96ae8a762a9e 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -51,6 +51,9 @@
  * Expected message may have a message level other than KERN_INFO.
  * Print the expected message only if the current loglevel will allow
  * the actual message to print.
+ *
+ * Do not use EXPECT_BEGIN() or EXPECT_END() for messages generated by
+ * pr_debug().
  */
 #define EXPECT_BEGIN(level, fmt, ...) \
 	printk(level pr_fmt("EXPECT \\ : ") fmt, ##__VA_ARGS__)
@@ -536,29 +539,77 @@ static void __init of_unittest_parse_phandle_with_args(void)
 
 	/* Check for missing cells property */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
+
 	rc = of_parse_phandle_with_args(np, "phandle-list",
 					"#phandle-cells-missing", 0, &args);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
+
 	rc = of_count_phandle_with_args(np, "phandle-list",
 					"#phandle-cells-missing");
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for bad phandle in list */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
+
 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 					"#phandle-cells", 0, &args);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
+
 	rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 					"#phandle-cells");
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: could not find phandle");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for incorrectly formed argument list */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1");
+
 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 					"#phandle-cells", 1, &args);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1");
+
 	rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 					"#phandle-cells");
+
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 }
 
@@ -669,20 +720,41 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
 
 	/* Check for missing cells,map,mask property */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-b: could not get #phandle-missing-cells for /testcase-data/phandle-tests/provider1");
+
 	rc = of_parse_phandle_with_args_map(np, "phandle-list",
 					    "phandle-missing", 0, &args);
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-b: could not get #phandle-missing-cells for /testcase-data/phandle-tests/provider1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for bad phandle in list */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-b: could not find phandle");
+
 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-phandle",
 					    "phandle", 0, &args);
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-b: could not find phandle");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for incorrectly formed argument list */
 	memset(&args, 0, sizeof(args));
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: /testcase-data/phandle-tests/consumer-b: #phandle-cells = 2 found -1");
+
 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-args",
 					    "phandle", 1, &args);
+	EXPECT_END(KERN_INFO,
+		   "OF: /testcase-data/phandle-tests/consumer-b: #phandle-cells = 2 found -1");
+
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 }
 
@@ -1213,7 +1285,15 @@ static void __init of_unittest_platform_populate(void)
 		np = of_find_node_by_path("/testcase-data/testcase-device2");
 		pdev = of_find_device_by_node(np);
 		unittest(pdev, "device 2 creation failed\n");
+
+		EXPECT_BEGIN(KERN_INFO,
+			     "platform testcase-data:testcase-device2: IRQ index 0 not found");
+
 		irq = platform_get_irq(pdev, 0);
+
+		EXPECT_END(KERN_INFO,
+			   "platform testcase-data:testcase-device2: IRQ index 0 not found");
+
 		unittest(irq < 0 && irq != -EPROBE_DEFER,
 			 "device parsing error failed - %d\n", irq);
 	}
@@ -1417,6 +1497,9 @@ static int __init unittest_data_add(void)
 		return 0;
 	}
 
+	EXPECT_BEGIN(KERN_INFO,
+		     "Duplicate name in testcase-data, renamed to \"duplicate-name#1\"");
+
 	/* attach the sub-tree to live tree */
 	np = unittest_data_node->child;
 	while (np) {
@@ -1427,6 +1510,9 @@ static int __init unittest_data_add(void)
 		np = next;
 	}
 
+	EXPECT_END(KERN_INFO,
+		   "Duplicate name in testcase-data, renamed to \"duplicate-name#1\"");
+
 	of_overlay_mutex_unlock();
 
 	return 0;
@@ -1769,8 +1855,18 @@ static int __init of_unittest_apply_revert_overlay_check(int overlay_nr,
 /* test activation of device */
 static void __init of_unittest_overlay_0(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest0/status");
+
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY))
+	ret = of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest0/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 0);
@@ -1779,28 +1875,58 @@ static void __init of_unittest_overlay_0(void)
 /* test deactivation of device */
 static void __init of_unittest_overlay_1(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest1/status");
+
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY))
+	ret = of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest1/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 1);
+
 }
 
 /* test activation of device */
 static void __init of_unittest_overlay_2(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest2/status");
+
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY))
-		return;
+	ret = of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest2/status");
 
+	if (ret)
+		return;
 	unittest(1, "overlay test %d passed\n", 2);
 }
 
 /* test deactivation of device */
 static void __init of_unittest_overlay_3(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest3/status");
+
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY))
+	ret = of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest3/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 3);
@@ -1819,8 +1945,18 @@ static void __init of_unittest_overlay_4(void)
 /* test overlay apply/revert sequence */
 static void __init of_unittest_overlay_5(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest5/status");
+
 	/* device should disable */
-	if (of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY))
+	ret = of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest5/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 5);
@@ -1834,6 +1970,8 @@ static void __init of_unittest_overlay_6(void)
 	int before = 0, after = 1;
 	const char *overlay_name;
 
+	int ret;
+
 	/* unittest device must be in before state */
 	for (i = 0; i < 2; i++) {
 		if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
@@ -1848,18 +1986,41 @@ static void __init of_unittest_overlay_6(void)
 	}
 
 	/* apply the overlays */
-	for (i = 0; i < 2; i++) {
 
-		overlay_name = overlay_name_from_nr(overlay_nr + i);
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status");
+
+	overlay_name = overlay_name_from_nr(overlay_nr + 0);
 
-		if (!overlay_data_apply(overlay_name, &ovcs_id)) {
-			unittest(0, "could not apply overlay \"%s\"\n",
-					overlay_name);
+	ret = overlay_data_apply(overlay_name, &ovcs_id);
+
+	if (!ret) {
+		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
+			return;
+	}
+	ov_id[0] = ovcs_id;
+	of_unittest_track_overlay(ov_id[0]);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status");
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status");
+
+	overlay_name = overlay_name_from_nr(overlay_nr + 1);
+
+	ret = overlay_data_apply(overlay_name, &ovcs_id);
+
+	if (!ret) {
+		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
 			return;
-		}
-		ov_id[i] = ovcs_id;
-		of_unittest_track_overlay(ov_id[i]);
 	}
+	ov_id[1] = ovcs_id;
+	of_unittest_track_overlay(ov_id[1]);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status");
+
 
 	for (i = 0; i < 2; i++) {
 		/* unittest device must be in after state */
@@ -1900,6 +2061,7 @@ static void __init of_unittest_overlay_6(void)
 	}
 
 	unittest(1, "overlay test %d passed\n", 6);
+
 }
 
 /* test overlay application in sequence */
@@ -1908,26 +2070,65 @@ static void __init of_unittest_overlay_8(void)
 	int i, ov_id[2], ovcs_id;
 	int overlay_nr = 8, unittest_nr = 8;
 	const char *overlay_name;
+	int ret;
 
 	/* we don't care about device state in this test */
 
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/status");
+
+	overlay_name = overlay_name_from_nr(overlay_nr + 0);
+
+	ret = overlay_data_apply(overlay_name, &ovcs_id);
+	if (!ret)
+		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/status");
+
+	if (!ret)
+		return;
+
+	ov_id[0] = ovcs_id;
+	of_unittest_track_overlay(ov_id[0]);
+
+	overlay_name = overlay_name_from_nr(overlay_nr + 1);
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/property-foo");
+
 	/* apply the overlays */
-	for (i = 0; i < 2; i++) {
+	ret = overlay_data_apply(overlay_name, &ovcs_id);
 
-		overlay_name = overlay_name_from_nr(overlay_nr + i);
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/property-foo");
 
-		if (!overlay_data_apply(overlay_name, &ovcs_id)) {
-			unittest(0, "could not apply overlay \"%s\"\n",
-					overlay_name);
-			return;
-		}
-		ov_id[i] = ovcs_id;
-		of_unittest_track_overlay(ov_id[i]);
+	if (!ret) {
+		unittest(0, "could not apply overlay \"%s\"\n", overlay_name);
+		return;
 	}
 
+	ov_id[1] = ovcs_id;
+	of_unittest_track_overlay(ov_id[1]);
+
 	/* now try to remove first overlay (it should fail) */
 	ovcs_id = ov_id[0];
-	if (!of_overlay_remove(&ovcs_id)) {
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8");
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: overlay #6 is not topmost");
+
+	ret = of_overlay_remove(&ovcs_id);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: overlay #6 is not topmost");
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8");
+
+	if (!ret) {
 		unittest(0, "%s was destroyed @\"%s\"\n",
 				overlay_name_from_nr(overlay_nr + 0),
 				unittest_path(unittest_nr,
@@ -1959,6 +2160,7 @@ static void __init of_unittest_overlay_10(void)
 
 	/* device should disable */
 	ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
+
 	if (unittest(ret == 0,
 			"overlay test %d failed; overlay application\n", 10))
 		return;
@@ -1982,6 +2184,7 @@ static void __init of_unittest_overlay_11(void)
 	/* device should disable */
 	ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
 			PDEV_OVERLAY);
+
 	unittest(ret == 0, "overlay test %d failed; overlay apply\n", 11);
 }
 
@@ -2212,12 +2415,21 @@ static int of_unittest_overlay_i2c_init(void)
 		return ret;
 
 	ret = platform_driver_register(&unittest_i2c_bus_driver);
+
 	if (unittest(ret == 0,
 			"could not register unittest i2c bus driver\n"))
 		return ret;
 
 #if IS_BUILTIN(CONFIG_I2C_MUX)
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "i2c i2c-1: Added multiplexed i2c bus 2");
+
 	ret = i2c_add_driver(&unittest_i2c_mux_driver);
+
+	EXPECT_END(KERN_INFO,
+		   "i2c i2c-1: Added multiplexed i2c bus 2");
+
 	if (unittest(ret == 0,
 			"could not register unittest i2c mux driver\n"))
 		return ret;
@@ -2237,8 +2449,18 @@ static void of_unittest_overlay_i2c_cleanup(void)
 
 static void __init of_unittest_overlay_i2c_12(void)
 {
+	int ret;
+
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY))
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12/status");
+
+	ret = of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 12);
@@ -2247,8 +2469,18 @@ static void __init of_unittest_overlay_i2c_12(void)
 /* test deactivation of device */
 static void __init of_unittest_overlay_i2c_13(void)
 {
+	int ret;
+
+	EXPECT_BEGIN(KERN_INFO,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13/status");
+
 	/* device should disable */
-	if (of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY))
+	ret = of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13/status");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 13);
@@ -2261,8 +2493,18 @@ static void of_unittest_overlay_i2c_14(void)
 
 static void __init of_unittest_overlay_i2c_15(void)
 {
+	int ret;
+
 	/* device should enable */
-	if (of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY))
+	EXPECT_BEGIN(KERN_INFO,
+		     "i2c i2c-1: Added multiplexed i2c bus 3");
+
+	ret = of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY);
+
+	EXPECT_END(KERN_INFO,
+		   "i2c i2c-1: Added multiplexed i2c bus 3");
+
+	if (ret)
 		return;
 
 	unittest(1, "overlay test %d passed\n", 15);
@@ -2723,6 +2965,7 @@ static __init void of_unittest_overlay_high_level(void)
 	struct device_node *overlay_base_symbols;
 	struct device_node **pprev;
 	struct property *prop;
+	int ret;
 
 	if (!overlay_base_root) {
 		unittest(0, "overlay_base_root not initialized\n");
@@ -2837,15 +3080,86 @@ static __init void of_unittest_overlay_high_level(void)
 
 	/* now do the normal overlay usage test */
 
-	unittest(overlay_data_apply("overlay", NULL),
-		 "Adding overlay 'overlay' failed\n");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/status");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/status");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@30/incline-up");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@40/incline-up");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/status");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/color");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/rate");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/hvac_2");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_left");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_right");
+
+	ret = overlay_data_apply("overlay", NULL);
+
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_right");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_left");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/hvac_2");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/rate");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/color");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/status");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@40/incline-up");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@30/incline-up");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/status");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/status");
+
+	unittest(ret, "Adding overlay 'overlay' failed\n");
+
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/controller");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/controller/name");
 
 	unittest(overlay_data_apply("overlay_bad_add_dup_node", NULL),
 		 "Adding overlay 'overlay_bad_add_dup_node' failed\n");
 
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/controller/name");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/controller");
+
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail");
+	EXPECT_BEGIN(KERN_ERR,
+		     "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/rpm_avail");
+
 	unittest(overlay_data_apply("overlay_bad_add_dup_prop", NULL),
 		 "Adding overlay 'overlay_bad_add_dup_prop' failed\n");
 
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/rpm_avail");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail");
+	EXPECT_END(KERN_ERR,
+		   "OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail");
+
 	unittest(overlay_data_apply("overlay_bad_phandle", NULL),
 		 "Adding overlay 'overlay_bad_phandle' failed\n");
 
@@ -2869,6 +3183,8 @@ static int __init of_unittest(void)
 	struct device_node *np;
 	int res;
 
+	pr_info("start of unittest - you will see error messages\n");
+
 	/* adding data for unittest */
 
 	if (IS_ENABLED(CONFIG_UML))
@@ -2887,7 +3203,6 @@ static int __init of_unittest(void)
 	}
 	of_node_put(np);
 
-	pr_info("start of unittest - you will see error messages\n");
 	of_unittest_check_tree_linkage();
 	of_unittest_check_phandles();
 	of_unittest_find_node_by_name();
-- 
Frank Rowand <frank.rowand@sony.com>

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Rob Herring]

On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
> From: Frank Rowand <frank.rowand@sony.com>
> 
> Geert reports that gpio hog nodes are not properly processed when
> the gpio hog node is added via an overlay reply and provides an
> RFC patch to fix the problem [1].
> 
> Add a unittest that shows the problem.  Unittest will report "1 failed"
> test before applying Geert's RFC patch and "0 failed" after applying
> Geert's RFC patch.
> 
> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
> 
> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> ---
> 
> changes since v1:
>   - base on 5.6-rc1
>   - fixed node names in overlays
>   - removed unused fields from struct unittest_gpio_dev
>   - of_unittest_overlay_gpio() cleaned up comments
>   - of_unittest_overlay_gpio() moved saving global values into
>     probe_pass_count and chip_request_count more tightly around
>     test code expected to trigger changes in the global values
> 
> v1 of this patch incorrectly reported that it had made changes
> since the RFC version, but it was mistakenly created from the
> wrong branch.
> 
> There are checkpatch warnings.
>   - New files are in a directory already covered by MAINTAINERS
>   - The undocumented compatibles are restricted to use by unittest
>     and should not be documented under Documentation
>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
>     is supplied by a define parameter instead of a hard coded constant
>   - The lines over 80 characters are consistent with unittest.c style
> 
> This unittest was also valuable in that it allowed me to explore
> possible issues related to the proposed solution to the gpio hog
> problem.
> 
> 
>  drivers/of/unittest-data/Makefile             |   8 +-
>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
>  8 files changed, 370 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
> 

Applied, thanks.

Rob

Re: [PATCH v2 2/2] of: unittest: annotate warnings triggered by unittest

[Rob Herring]

On Thu, 20 Feb 2020 12:40:21 -0600, frowand.list@gmail.com wrote:
> From: Frank Rowand <frank.rowand@sony.com>
> 
> Some tests in the devicetree unittests result in printk messages
> from the code being tested.  It can be difficult to determine
> whether the messages are the result of unittest or are potentially
> reporting bugs that should be fixed.  The most recent example of
> a person asking whether to be concerned about these messages is [1].
> 
> Add annotations for all messages triggered by unittests, except
> KERN_DEBUG messages.  (KERN_DEBUG is a special case due to the
> possible interaction of CONFIG_DYNAMIC_DEBUG.)
> 
> The format of the annotations is expected to change when unittests
> are converted to use the kunit infrastructure when the broader
> testing community has an opportunity to discuss the implementation
> of annotations of test triggered messages.
> 
> [1] https://lore.kernel.org/r/6021ac63-b5e0-ed3d-f964-7c6ef579cd68@huawei.com
> 
> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> ---
> changes since v1:
>   - none
> 
>  drivers/of/unittest.c | 375 ++++++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 345 insertions(+), 30 deletions(-)
> 

Applied, thanks.

Rob

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Frank Rowand]

Hi Anders,

On 3/13/20 4:51 AM, Anders Roxell wrote:
> From: Rob Herring <robh@kernel.org>
> 
>> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
>>> From: Frank Rowand <frank.rowand@sony.com>
>>>
>>> Geert reports that gpio hog nodes are not properly processed when
>>> the gpio hog node is added via an overlay reply and provides an
>>> RFC patch to fix the problem [1].
>>>
>>> Add a unittest that shows the problem.  Unittest will report "1 failed"
>>> test before applying Geert's RFC patch and "0 failed" after applying
>>> Geert's RFC patch.
>>>
>>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
>>>
>>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> 
> I'm building arm64 on tag next-20200312, and booting in qemu, and I see
> this "Kernel panic":

Thank you for the panic report.

There has also been an x86_64 failure (with a very different stack trace).
I am going to investigate the x86_64 failure first.

Can you please send the kernel .config?

Thanks,

Frank


> 
> [...]
> [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
> [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
> [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
> [[0;32m  OK  [0m] Mounted Huge Pages File System.
> [  172.917332][    T1] systemd[1]: Mounted Debug File System.
> [[0;32m  OK  [0m] Mounted Debug File System.
> [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
> [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
> [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
> [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
> [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
> [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
> [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
> [  174.286169][  T240] Mem abort info:
> [  174.303268][  T240]   ESR = 0x96000004
> [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  174.323298][  T240]   SET = 0, FnV = 0
> [  174.324677][  T240]   EA = 0, S1PTW = 0
> [  174.325937][  T240] Data abort info:
> [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
> [  174.359310][  T240]   CM = 0, WnR = 0
> [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
> [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> [  174.381030][  T240] Modules linked in:
> [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
> [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
> [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
> [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
> [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
> [  174.393325][  T240] sp : ffff00006374faa0
> [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040 
> [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000 
> [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010 
> [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800 
> [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008 
> [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000 
> [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000 
> [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000 
> [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800 
> [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff 
> [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000 
> [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f 
> [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d 
> [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001 
> [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000 
> [  174.424954][  T240] Call trace:
> [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
> [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
> [  174.429306][  T240]  seq_read+0x3a4/0x8e8
> [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
> [  174.432244][  T240]  __vfs_read+0x64/0xc0
> [  174.433622][  T240]  vfs_read+0x158/0x2b0
> [  174.435014][  T240]  ksys_read+0xfc/0x1e0
> [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
> [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
> [  174.439795][  T240]  do_el0_svc+0xe4/0x100
> [  174.441218][  T240]  el0_svc+0x70/0x80
> [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
> [  174.444143][  T240]  el0_sync+0x164/0x180
> [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355) 
> [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
> [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
> [  174.451590][  T240] Kernel Offset: disabled
> [  174.453005][  T240] CPU features: 0x80002,20002004
> [  174.454597][  T240] Memory Limit: none
> [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
> 
> When I say CONFIG_OF_UNITTEST=n it works.
> If I revert there it starts to work when I revert the last one,
> f4056e705b2e, from the list below:
> 
> 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
> 0ac174397940 of: unittest: annotate warnings triggered by unittest
> f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
> 
> Cheers,
> Anders
> 
>>> ---
>>>
>>> changes since v1:
>>>   - base on 5.6-rc1
>>>   - fixed node names in overlays
>>>   - removed unused fields from struct unittest_gpio_dev
>>>   - of_unittest_overlay_gpio() cleaned up comments
>>>   - of_unittest_overlay_gpio() moved saving global values into
>>>     probe_pass_count and chip_request_count more tightly around
>>>     test code expected to trigger changes in the global values
>>>
>>> v1 of this patch incorrectly reported that it had made changes
>>> since the RFC version, but it was mistakenly created from the
>>> wrong branch.
>>>
>>> There are checkpatch warnings.
>>>   - New files are in a directory already covered by MAINTAINERS
>>>   - The undocumented compatibles are restricted to use by unittest
>>>     and should not be documented under Documentation
>>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
>>>     is supplied by a define parameter instead of a hard coded constant
>>>   - The lines over 80 characters are consistent with unittest.c style
>>>
>>> This unittest was also valuable in that it allowed me to explore
>>> possible issues related to the proposed solution to the gpio hog
>>> problem.
>>>
>>>
>>>  drivers/of/unittest-data/Makefile             |   8 +-
>>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
>>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
>>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
>>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
>>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
>>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
>>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
>>>  8 files changed, 370 insertions(+), 1 deletion(-)
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
>>>
>>
>> Applied, thanks.
>>
>> Rob
> 
> 

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Anders Roxell]

On Fri, 13 Mar 2020 at 17:40, Frank Rowand <frowand.list@gmail.com> wrote:
>
> Hi Anders,
>
> On 3/13/20 4:51 AM, Anders Roxell wrote:
> > From: Rob Herring <robh@kernel.org>
> >
> >> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
> >>> From: Frank Rowand <frank.rowand@sony.com>
> >>>
> >>> Geert reports that gpio hog nodes are not properly processed when
> >>> the gpio hog node is added via an overlay reply and provides an
> >>> RFC patch to fix the problem [1].
> >>>
> >>> Add a unittest that shows the problem.  Unittest will report "1 failed"
> >>> test before applying Geert's RFC patch and "0 failed" after applying
> >>> Geert's RFC patch.
> >>>
> >>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
> >>>
> >>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> >
> > I'm building arm64 on tag next-20200312, and booting in qemu, and I see
> > this "Kernel panic":
>
> Thank you for the panic report.
>
> There has also been an x86_64 failure (with a very different stack trace).
> I am going to investigate the x86_64 failure first.

OK.

>
> Can you please send the kernel .config?

https://s3.amazonaws.com/builds.tuxbuild.com/43BB3Qry46bSzMK82iPbBg/kernel.config


Cheers,
Anders

>
> Thanks,
>
> Frank
>
>
> >
> > [...]
> > [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
> > [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
> > [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
> > [[0;32m  OK  [0m] Mounted Huge Pages File System.
> > [  172.917332][    T1] systemd[1]: Mounted Debug File System.
> > [[0;32m  OK  [0m] Mounted Debug File System.
> > [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
> > [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
> > [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
> > [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
> > [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
> > [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
> > [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
> > [  174.286169][  T240] Mem abort info:
> > [  174.303268][  T240]   ESR = 0x96000004
> > [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
> > [  174.323298][  T240]   SET = 0, FnV = 0
> > [  174.324677][  T240]   EA = 0, S1PTW = 0
> > [  174.325937][  T240] Data abort info:
> > [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
> > [  174.359310][  T240]   CM = 0, WnR = 0
> > [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
> > [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> > [  174.381030][  T240] Modules linked in:
> > [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
> > [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
> > [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
> > [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
> > [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
> > [  174.393325][  T240] sp : ffff00006374faa0
> > [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040
> > [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000
> > [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010
> > [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800
> > [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008
> > [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000
> > [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000
> > [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000
> > [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800
> > [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff
> > [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000
> > [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f
> > [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d
> > [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001
> > [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000
> > [  174.424954][  T240] Call trace:
> > [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
> > [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
> > [  174.429306][  T240]  seq_read+0x3a4/0x8e8
> > [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
> > [  174.432244][  T240]  __vfs_read+0x64/0xc0
> > [  174.433622][  T240]  vfs_read+0x158/0x2b0
> > [  174.435014][  T240]  ksys_read+0xfc/0x1e0
> > [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
> > [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
> > [  174.439795][  T240]  do_el0_svc+0xe4/0x100
> > [  174.441218][  T240]  el0_svc+0x70/0x80
> > [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
> > [  174.444143][  T240]  el0_sync+0x164/0x180
> > [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355)
> > [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
> > [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
> > [  174.451590][  T240] Kernel Offset: disabled
> > [  174.453005][  T240] CPU features: 0x80002,20002004
> > [  174.454597][  T240] Memory Limit: none
> > [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
> >
> > When I say CONFIG_OF_UNITTEST=n it works.
> > If I revert there it starts to work when I revert the last one,
> > f4056e705b2e, from the list below:
> >
> > 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
> > 0ac174397940 of: unittest: annotate warnings triggered by unittest
> > f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
> >
> > Cheers,
> > Anders
> >
> >>> ---
> >>>
> >>> changes since v1:
> >>>   - base on 5.6-rc1
> >>>   - fixed node names in overlays
> >>>   - removed unused fields from struct unittest_gpio_dev
> >>>   - of_unittest_overlay_gpio() cleaned up comments
> >>>   - of_unittest_overlay_gpio() moved saving global values into
> >>>     probe_pass_count and chip_request_count more tightly around
> >>>     test code expected to trigger changes in the global values
> >>>
> >>> v1 of this patch incorrectly reported that it had made changes
> >>> since the RFC version, but it was mistakenly created from the
> >>> wrong branch.
> >>>
> >>> There are checkpatch warnings.
> >>>   - New files are in a directory already covered by MAINTAINERS
> >>>   - The undocumented compatibles are restricted to use by unittest
> >>>     and should not be documented under Documentation
> >>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
> >>>     is supplied by a define parameter instead of a hard coded constant
> >>>   - The lines over 80 characters are consistent with unittest.c style
> >>>
> >>> This unittest was also valuable in that it allowed me to explore
> >>> possible issues related to the proposed solution to the gpio hog
> >>> problem.
> >>>
> >>>
> >>>  drivers/of/unittest-data/Makefile             |   8 +-
> >>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
> >>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
> >>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
> >>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
> >>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
> >>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
> >>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
> >>>  8 files changed, 370 insertions(+), 1 deletion(-)
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
> >>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
> >>>
> >>
> >> Applied, thanks.
> >>
> >> Rob
> >
> >
>

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Frank Rowand]

On 3/13/20 11:40 AM, Frank Rowand wrote:
> Hi Anders,
> 
> On 3/13/20 4:51 AM, Anders Roxell wrote:
>> From: Rob Herring <robh@kernel.org>
>>
>>> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
>>>> From: Frank Rowand <frank.rowand@sony.com>
>>>>
>>>> Geert reports that gpio hog nodes are not properly processed when
>>>> the gpio hog node is added via an overlay reply and provides an
>>>> RFC patch to fix the problem [1].
>>>>
>>>> Add a unittest that shows the problem.  Unittest will report "1 failed"
>>>> test before applying Geert's RFC patch and "0 failed" after applying
>>>> Geert's RFC patch.
>>>>
>>>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
>>>>
>>>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
>>
>> I'm building arm64 on tag next-20200312, and booting in qemu, and I see
>> this "Kernel panic":
> 
> Thank you for the panic report.
> 
> There has also been an x86_64 failure (with a very different stack trace).
> I am going to investigate the x86_64 failure first.

I have fixed the x86_64 failure:

   https://lore.kernel.org/linux-devicetree/1585187131-21642-1-git-send-email-frowand.list@gmail.com/

Can you check if the two patches in that series fixes the problem that you
are seeing?

Thanks,

Frank


> 
> Can you please send the kernel .config?
> 
> Thanks,
> 
> Frank
> 
> 
>>
>> [...]
>> [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
>> [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
>> [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
>> [[0;32m  OK  [0m] Mounted Huge Pages File System.
>> [  172.917332][    T1] systemd[1]: Mounted Debug File System.
>> [[0;32m  OK  [0m] Mounted Debug File System.
>> [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
>> [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
>> [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
>> [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
>> [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
>> [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
>> [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
>> [  174.286169][  T240] Mem abort info:
>> [  174.303268][  T240]   ESR = 0x96000004
>> [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
>> [  174.323298][  T240]   SET = 0, FnV = 0
>> [  174.324677][  T240]   EA = 0, S1PTW = 0
>> [  174.325937][  T240] Data abort info:
>> [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
>> [  174.359310][  T240]   CM = 0, WnR = 0
>> [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
>> [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
>> [  174.381030][  T240] Modules linked in:
>> [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
>> [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
>> [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
>> [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
>> [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
>> [  174.393325][  T240] sp : ffff00006374faa0
>> [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040 
>> [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000 
>> [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010 
>> [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800 
>> [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008 
>> [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000 
>> [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000 
>> [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000 
>> [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800 
>> [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff 
>> [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000 
>> [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f 
>> [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d 
>> [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001 
>> [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000 
>> [  174.424954][  T240] Call trace:
>> [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
>> [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
>> [  174.429306][  T240]  seq_read+0x3a4/0x8e8
>> [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
>> [  174.432244][  T240]  __vfs_read+0x64/0xc0
>> [  174.433622][  T240]  vfs_read+0x158/0x2b0
>> [  174.435014][  T240]  ksys_read+0xfc/0x1e0
>> [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
>> [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
>> [  174.439795][  T240]  do_el0_svc+0xe4/0x100
>> [  174.441218][  T240]  el0_svc+0x70/0x80
>> [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
>> [  174.444143][  T240]  el0_sync+0x164/0x180
>> [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355) 
>> [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
>> [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
>> [  174.451590][  T240] Kernel Offset: disabled
>> [  174.453005][  T240] CPU features: 0x80002,20002004
>> [  174.454597][  T240] Memory Limit: none
>> [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
>>
>> When I say CONFIG_OF_UNITTEST=n it works.
>> If I revert there it starts to work when I revert the last one,
>> f4056e705b2e, from the list below:
>>
>> 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
>> 0ac174397940 of: unittest: annotate warnings triggered by unittest
>> f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
>>
>> Cheers,
>> Anders
>>
>>>> ---
>>>>
>>>> changes since v1:
>>>>   - base on 5.6-rc1
>>>>   - fixed node names in overlays
>>>>   - removed unused fields from struct unittest_gpio_dev
>>>>   - of_unittest_overlay_gpio() cleaned up comments
>>>>   - of_unittest_overlay_gpio() moved saving global values into
>>>>     probe_pass_count and chip_request_count more tightly around
>>>>     test code expected to trigger changes in the global values
>>>>
>>>> v1 of this patch incorrectly reported that it had made changes
>>>> since the RFC version, but it was mistakenly created from the
>>>> wrong branch.
>>>>
>>>> There are checkpatch warnings.
>>>>   - New files are in a directory already covered by MAINTAINERS
>>>>   - The undocumented compatibles are restricted to use by unittest
>>>>     and should not be documented under Documentation
>>>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
>>>>     is supplied by a define parameter instead of a hard coded constant
>>>>   - The lines over 80 characters are consistent with unittest.c style
>>>>
>>>> This unittest was also valuable in that it allowed me to explore
>>>> possible issues related to the proposed solution to the gpio hog
>>>> problem.
>>>>
>>>>
>>>>  drivers/of/unittest-data/Makefile             |   8 +-
>>>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
>>>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
>>>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
>>>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
>>>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
>>>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
>>>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
>>>>  8 files changed, 370 insertions(+), 1 deletion(-)
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
>>>>
>>>
>>> Applied, thanks.
>>>
>>> Rob
>>
>>
> 
> 

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Anders Roxell]

On Thu, 26 Mar 2020 at 02:56, Frank Rowand <frowand.list@gmail.com> wrote:
>
> On 3/13/20 11:40 AM, Frank Rowand wrote:
> > Hi Anders,
> >
> > On 3/13/20 4:51 AM, Anders Roxell wrote:
> >> From: Rob Herring <robh@kernel.org>
> >>
> >>> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
> >>>> From: Frank Rowand <frank.rowand@sony.com>
> >>>>
> >>>> Geert reports that gpio hog nodes are not properly processed when
> >>>> the gpio hog node is added via an overlay reply and provides an
> >>>> RFC patch to fix the problem [1].
> >>>>
> >>>> Add a unittest that shows the problem.  Unittest will report "1 failed"
> >>>> test before applying Geert's RFC patch and "0 failed" after applying
> >>>> Geert's RFC patch.
> >>>>
> >>>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
> >>>>
> >>>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> >>
> >> I'm building arm64 on tag next-20200312, and booting in qemu, and I see
> >> this "Kernel panic":
> >
> > Thank you for the panic report.
> >
> > There has also been an x86_64 failure (with a very different stack trace).
> > I am going to investigate the x86_64 failure first.
>
> I have fixed the x86_64 failure:

Great.

>
>    https://lore.kernel.org/linux-devicetree/1585187131-21642-1-git-send-email-frowand.list@gmail.com/
>
> Can you check if the two patches in that series fixes the problem that you
> are seeing?

I got a new error instead.

next-20200325 before I applied your patches [1]:

[ 1933.602460][ T2795] random: get_random_u64 called from
arch_mmap_rnd+0x90/0xb8 with crng_init=1
[ 1933.602770][ T2795] random: get_random_u64 called from
randomize_stack_top+0x50/0xb8 with crng_init=1
[ 1933.603017][ T2795] random: get_random_u32 called from
arch_align_stack+0x70/0x90 with crng_init=1
[ 1936.391730][    T1] systemd[1]: Mounted Configuration File System.
[ [0;32m  OK   [0m] Mounted Configuration File System.
[ 1937.577008][ T2787] Unable to handle kernel paging request at
virtual address ccccccccccccccd4
[ 1937.604944][ T2787] Mem abort info:
[ 1937.622884][ T2787]   ESR = 0x96000004
[ 1937.624443][ T2787]   EC = 0x25: DABT (current EL), IL = 32 bits
[ 1937.651817][ T2787]   SET = 0, FnV = 0
[ 1937.672276][ T2787]   EA = 0, S1PTW = 0
[ 1937.679201][ T2787] Data abort info:
[ 1937.680594][ T2787]   ISV = 0, ISS = 0x00000004
[ 1937.705713][ T2787]   CM = 0, WnR = 0
[ 1937.707184][ T2787] [ccccccccccccccd4] address between user and
kernel address ranges
[ 1937.725628][ T2787] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 1937.727743][ T2787] Modules linked in:
[ 1937.729157][ T2787] CPU: 0 PID: 2787 Comm: systemd-journal Tainted:
G    B   W       T 5.6.0-rc7-next-20200325-11880-gbae0ebe545c5 #1
[ 1937.733403][ T2787] Hardware name: linux,dummy-virt (DT)
[ 1937.735393][ T2787] pstate: 40400005 (nZcv daif +PAN -UAO)
[ 1937.737480][ T2787] pc : sysfs_file_ops+0xd0/0xf0
[ 1937.739292][ T2787] lr : sysfs_file_ops+0xd0/0xf0
[ 1937.741052][ T2787] sp : ffff000062287a80
[ 1937.742614][ T2787] x29: ffff000062287a80 x28: ffff000060868040
[ 1937.744875][ T2787] x27: ffff000068553810 x26: ffff000062287d80
[ 1937.747164][ T2787] x25: ffff00006263b200 x24: ffff000068415528
[ 1937.749355][ T2787] x23: ffff000068415538 x22: 0000000000000001
[ 1937.751610][ T2787] x21: ffff000068553810 x20: 0000000000000000
[ 1937.753908][ T2787] x19: cccccccccccccccc x18: 0000000000007ec0
[ 1937.756130][ T2787] x17: 0000000000002208 x16: 0000000000001650
[ 1937.758384][ T2787] x15: 0000000000000000 x14: 0000000000000000
[ 1937.760481][ T2787] x13: 0000000000000000 x12: 0000000000002240
[ 1937.762720][ T2787] x11: 00000000f1f1f1f1 x10: ffff000060868040
[ 1937.764810][ T2787] x9 : ffffa00010a03d28 x8 : 1fffe0000c3c2730
[ 1937.766856][ T2787] x7 : ffff80000c3c2730 x6 : dfffa00000000000
[ 1937.768926][ T2787] x5 : ffff000060868040 x4 : 0000000000000000
[ 1937.770980][ T2787] x3 : ffffa00010a03bc8 x2 : 0000000000000001
[ 1937.773041][ T2787] x1 : ffffa0001626d000 x0 : 0000000000000000
[ 1937.775068][ T2787] Call trace:
[ 1937.776252][ T2787]  sysfs_file_ops+0xd0/0xf0
[ 1937.777785][ T2787]  sysfs_kf_seq_show+0x70/0x240
[ 1937.779429][ T2787]  kernfs_seq_show+0xa8/0xc0
[ 1937.781004][ T2787]  seq_read+0x350/0x860
[ 1937.782437][ T2787]  kernfs_fop_read+0x94/0x3f8
[ 1937.784013][ T2787]  __vfs_read+0x68/0xc8
[ 1937.785456][ T2787]  vfs_read+0x15c/0x2b0
[ 1937.786876][ T2787]  ksys_read+0x104/0x1e8
[ 1937.788318][ T2787]  __arm64_sys_read+0x54/0x68
[ 1937.789931][ T2787]  el0_svc_common.constprop.0+0x294/0x338
[ 1937.791822][ T2787]  do_el0_svc+0xe8/0x108
[ 1937.793287][ T2787]  el0_svc+0x74/0x88
[ 1937.794656][ T2787]  el0_sync_handler+0xcc/0x77c
[ 1937.796259][ T2787]  el0_sync+0x17c/0x180
[ 1937.797758][ T2787] Code: b40000b3 97e8e4d9 91002260 97f6c841 (f9400673)
[ 1937.800049][ T2787] ---[ end trace 8e9be5808e45ebb1 ]---
[ 1937.801854][ T2787] Kernel panic - not syncing: Fatal exception
[ 1937.803844][ T2787] Kernel Offset: disabled
[ 1937.805325][ T2787] CPU features: 0x080002,20002004
[ 1937.806961][ T2787] Memory Limit: none
[ 1937.808349][ T2787] ---[ end Kernel panic - not syncing: Fatal exception ]---

and with the two patches applied I see this [2]:

node:test-bus:test-unittest0'
[ 1839.107618][    T1] PM: Removing info for
platform:testcase-data:overlay-node:test-bus:test-unittest0
[ 1839.111218][    T1] kobject:
'testcase-data:overlay-node:test-bus:test-unittest0'
((____ptrval____)): kobject_uevent_env
[ 1839.116021][    T1] kobject:
'testcase-data:overlay-node:test-bus:test-unittest0'
((____ptrval____)): fill_kobj_path: path =
'/devices/platform/testcase-data:overlay-node:test-bus:test-unittest0'
[ 1839.124287][    T1] kobject:
'testcase-data:overlay-node:test-bus:test-unittest0'
((____ptrval____)): kobject_release, parent (____ptrval____) (delayed
1000)
[ 1839.130497][    T1] Unexpected kernel BRK exception at EL1
[ 1839.132466][    T1] Internal error: ptrace BRK handler: f20003e8
[#1] PREEMPT SMP
[ 1839.134933][    T1] Modules linked in:
[ 1839.136395][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B
W       T 5.6.0-rc7-next-20200325-11882-ge7ffe3ef0d63 #1
[ 1839.140051][    T1] Hardware name: linux,dummy-virt (DT)
[ 1839.141976][    T1] pstate: 80400005 (Nzcv daif +PAN -UAO)
[ 1839.143958][    T1] pc : of_unittest_untrack_overlay+0x6c/0x13c
[ 1839.146026][    T1] lr : of_unittest_untrack_overlay+0x6c/0x13c
[ 1839.148046][    T1] sp : ffff000069807af0
[ 1839.149468][    T1] x29: ffff000069807af0 x28: ffffa00017258000
[ 1839.151579][    T1] x27: ffffa00017258400 x26: 0000000000000000
[ 1839.153635][    T1] x25: ffffa00017258480 x24: ffffa00013418a20
[ 1839.155735][    T1] x23: 0000000000000000 x22: ffffa000152dc880
[ 1839.157828][    T1] x21: 0000000000000000 x20: 00000000ffffffff
[ 1839.160076][    T1] x19: 00000000ffffffff x18: 0000000000001ca0
[ 1839.162198][    T1] x17: 00000000000019d8 x16: 0000000000001c60
[ 1839.164321][    T1] x15: 00000000000019b8 x14: 616c65642820295f
[ 1839.166388][    T1] x13: 5f5f5f6c61767274 x12: 705f5f5f5f282074
[ 1839.168503][    T1] x11: 00000000f1f1f1f1 x10: ffff00006a3f8040
[ 1839.170589][    T1] x9 : ffffa00013d6f370 x8 : 1ffff40002a5a688
[ 1839.172686][    T1] x7 : ffff940002a5a688 x6 : dfffa00000000000
[ 1839.174781][    T1] x5 : ffff00006a3f8040 x4 : 0000000000000000
[ 1839.176871][    T1] x3 : ffffa00011f234ac x2 : 00000000ffffffff
[ 1839.178947][    T1] x1 : ffff00006a3f8040 x0 : 0000000000000000
[ 1839.181034][    T1] Call trace:
[ 1839.182286][    T1]  of_unittest_untrack_overlay+0x6c/0x13c
[ 1839.184295][    T1]  of_unittest+0x3330/0x3638
[ 1839.185892][    T1]  do_one_initcall+0x480/0xa40
[ 1839.187598][    T1]  kernel_init_freeable+0x794/0x95c
[ 1839.189394][    T1]  kernel_init+0x20/0x1f8
[ 1839.190924][    T1]  ret_from_fork+0x10/0x18
[ 1839.192523][    T1] Code: 97955a2c d4210000 14000024 97955a29 (d4207d00)
[ 1839.194889][    T1] ---[ end trace 39370fb7c4bf9e64 ]---
[ 1839.196706][    T1] Kernel panic - not syncing: Fatal exception
[ 1839.198735][    T1] Kernel Offset: disabled
[ 1839.200246][    T1] CPU features: 0x080002,20002004
[ 1839.201900][    T1] Memory Limit: none
[ 1839.203340][    T1] ---[ end Kernel panic - not syncing: Fatal exception ]---

Cheers,
Anders
[1] https://people.linaro.org/~anders.roxell/output-next-20200325.log
[2] https://people.linaro.org/~anders.roxell/output-next-20200325.test.log

>
> Thanks,
>
> Frank
>
>
> >
> > Can you please send the kernel .config?
> >
> > Thanks,
> >
> > Frank
> >
> >
> >>
> >> [...]
> >> [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
> >> [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
> >> [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
> >> [[0;32m  OK  [0m] Mounted Huge Pages File System.
> >> [  172.917332][    T1] systemd[1]: Mounted Debug File System.
> >> [[0;32m  OK  [0m] Mounted Debug File System.
> >> [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
> >> [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
> >> [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
> >> [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
> >> [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
> >> [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
> >> [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
> >> [  174.286169][  T240] Mem abort info:
> >> [  174.303268][  T240]   ESR = 0x96000004
> >> [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
> >> [  174.323298][  T240]   SET = 0, FnV = 0
> >> [  174.324677][  T240]   EA = 0, S1PTW = 0
> >> [  174.325937][  T240] Data abort info:
> >> [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
> >> [  174.359310][  T240]   CM = 0, WnR = 0
> >> [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
> >> [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> >> [  174.381030][  T240] Modules linked in:
> >> [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
> >> [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
> >> [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
> >> [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
> >> [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
> >> [  174.393325][  T240] sp : ffff00006374faa0
> >> [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040
> >> [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000
> >> [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010
> >> [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800
> >> [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008
> >> [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000
> >> [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000
> >> [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000
> >> [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800
> >> [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff
> >> [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000
> >> [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f
> >> [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d
> >> [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001
> >> [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000
> >> [  174.424954][  T240] Call trace:
> >> [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
> >> [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
> >> [  174.429306][  T240]  seq_read+0x3a4/0x8e8
> >> [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
> >> [  174.432244][  T240]  __vfs_read+0x64/0xc0
> >> [  174.433622][  T240]  vfs_read+0x158/0x2b0
> >> [  174.435014][  T240]  ksys_read+0xfc/0x1e0
> >> [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
> >> [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
> >> [  174.439795][  T240]  do_el0_svc+0xe4/0x100
> >> [  174.441218][  T240]  el0_svc+0x70/0x80
> >> [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
> >> [  174.444143][  T240]  el0_sync+0x164/0x180
> >> [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355)
> >> [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
> >> [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
> >> [  174.451590][  T240] Kernel Offset: disabled
> >> [  174.453005][  T240] CPU features: 0x80002,20002004
> >> [  174.454597][  T240] Memory Limit: none
> >> [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
> >>
> >> When I say CONFIG_OF_UNITTEST=n it works.
> >> If I revert there it starts to work when I revert the last one,
> >> f4056e705b2e, from the list below:
> >>
> >> 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
> >> 0ac174397940 of: unittest: annotate warnings triggered by unittest
> >> f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
> >>
> >> Cheers,
> >> Anders
> >>
> >>>> ---
> >>>>
> >>>> changes since v1:
> >>>>   - base on 5.6-rc1
> >>>>   - fixed node names in overlays
> >>>>   - removed unused fields from struct unittest_gpio_dev
> >>>>   - of_unittest_overlay_gpio() cleaned up comments
> >>>>   - of_unittest_overlay_gpio() moved saving global values into
> >>>>     probe_pass_count and chip_request_count more tightly around
> >>>>     test code expected to trigger changes in the global values
> >>>>
> >>>> v1 of this patch incorrectly reported that it had made changes
> >>>> since the RFC version, but it was mistakenly created from the
> >>>> wrong branch.
> >>>>
> >>>> There are checkpatch warnings.
> >>>>   - New files are in a directory already covered by MAINTAINERS
> >>>>   - The undocumented compatibles are restricted to use by unittest
> >>>>     and should not be documented under Documentation
> >>>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
> >>>>     is supplied by a define parameter instead of a hard coded constant
> >>>>   - The lines over 80 characters are consistent with unittest.c style
> >>>>
> >>>> This unittest was also valuable in that it allowed me to explore
> >>>> possible issues related to the proposed solution to the gpio hog
> >>>> problem.
> >>>>
> >>>>
> >>>>  drivers/of/unittest-data/Makefile             |   8 +-
> >>>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
> >>>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
> >>>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
> >>>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
> >>>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
> >>>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
> >>>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
> >>>>  8 files changed, 370 insertions(+), 1 deletion(-)
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
> >>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
> >>>>
> >>>
> >>> Applied, thanks.
> >>>
> >>> Rob
> >>
> >>
> >
> >
>

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Frank Rowand]

Hi Anders,

On 3/26/20 5:39 AM, Anders Roxell wrote:
> On Thu, 26 Mar 2020 at 02:56, Frank Rowand <frowand.list@gmail.com> wrote:
>>
>> On 3/13/20 11:40 AM, Frank Rowand wrote:
>>> Hi Anders,
>>>
>>> On 3/13/20 4:51 AM, Anders Roxell wrote:
>>>> From: Rob Herring <robh@kernel.org>
>>>>
>>>>> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
>>>>>> From: Frank Rowand <frank.rowand@sony.com>
>>>>>>
>>>>>> Geert reports that gpio hog nodes are not properly processed when
>>>>>> the gpio hog node is added via an overlay reply and provides an
>>>>>> RFC patch to fix the problem [1].
>>>>>>
>>>>>> Add a unittest that shows the problem.  Unittest will report "1 failed"
>>>>>> test before applying Geert's RFC patch and "0 failed" after applying
>>>>>> Geert's RFC patch.
>>>>>>
>>>>>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
>>>>>>
>>>>>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
>>>>
>>>> I'm building arm64 on tag next-20200312, and booting in qemu, and I see
>>>> this "Kernel panic":
>>>
>>> Thank you for the panic report.
>>>
>>> There has also been an x86_64 failure (with a very different stack trace).
>>> I am going to investigate the x86_64 failure first.
>>
>> I have fixed the x86_64 failure:
> 
> Great.
> 
>>
>>    https://lore.kernel.org/linux-devicetree/1585187131-21642-1-git-send-email-frowand.list@gmail.com/
>>
>> Can you check if the two patches in that series fixes the problem that you
>> are seeing?
> 
> I got a new error instead.
> 
> next-20200325 before I applied your patches [1]:
> 
> [ 1933.602460][ T2795] random: get_random_u64 called from
> arch_mmap_rnd+0x90/0xb8 with crng_init=1
> [ 1933.602770][ T2795] random: get_random_u64 called from
> randomize_stack_top+0x50/0xb8 with crng_init=1
> [ 1933.603017][ T2795] random: get_random_u32 called from
> arch_align_stack+0x70/0x90 with crng_init=1
> [ 1936.391730][    T1] systemd[1]: Mounted Configuration File System.
> [ [0;32m  OK   [0m] Mounted Configuration File System.
> [ 1937.577008][ T2787] Unable to handle kernel paging request at
> virtual address ccccccccccccccd4
> [ 1937.604944][ T2787] Mem abort info:
> [ 1937.622884][ T2787]   ESR = 0x96000004
> [ 1937.624443][ T2787]   EC = 0x25: DABT (current EL), IL = 32 bits
> [ 1937.651817][ T2787]   SET = 0, FnV = 0
> [ 1937.672276][ T2787]   EA = 0, S1PTW = 0
> [ 1937.679201][ T2787] Data abort info:
> [ 1937.680594][ T2787]   ISV = 0, ISS = 0x00000004
> [ 1937.705713][ T2787]   CM = 0, WnR = 0
> [ 1937.707184][ T2787] [ccccccccccccccd4] address between user and
> kernel address ranges
> [ 1937.725628][ T2787] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> [ 1937.727743][ T2787] Modules linked in:
> [ 1937.729157][ T2787] CPU: 0 PID: 2787 Comm: systemd-journal Tainted:
> G    B   W       T 5.6.0-rc7-next-20200325-11880-gbae0ebe545c5 #1
> [ 1937.733403][ T2787] Hardware name: linux,dummy-virt (DT)
> [ 1937.735393][ T2787] pstate: 40400005 (nZcv daif +PAN -UAO)
> [ 1937.737480][ T2787] pc : sysfs_file_ops+0xd0/0xf0
> [ 1937.739292][ T2787] lr : sysfs_file_ops+0xd0/0xf0
> [ 1937.741052][ T2787] sp : ffff000062287a80
> [ 1937.742614][ T2787] x29: ffff000062287a80 x28: ffff000060868040
> [ 1937.744875][ T2787] x27: ffff000068553810 x26: ffff000062287d80
> [ 1937.747164][ T2787] x25: ffff00006263b200 x24: ffff000068415528
> [ 1937.749355][ T2787] x23: ffff000068415538 x22: 0000000000000001
> [ 1937.751610][ T2787] x21: ffff000068553810 x20: 0000000000000000
> [ 1937.753908][ T2787] x19: cccccccccccccccc x18: 0000000000007ec0
> [ 1937.756130][ T2787] x17: 0000000000002208 x16: 0000000000001650
> [ 1937.758384][ T2787] x15: 0000000000000000 x14: 0000000000000000
> [ 1937.760481][ T2787] x13: 0000000000000000 x12: 0000000000002240
> [ 1937.762720][ T2787] x11: 00000000f1f1f1f1 x10: ffff000060868040
> [ 1937.764810][ T2787] x9 : ffffa00010a03d28 x8 : 1fffe0000c3c2730
> [ 1937.766856][ T2787] x7 : ffff80000c3c2730 x6 : dfffa00000000000
> [ 1937.768926][ T2787] x5 : ffff000060868040 x4 : 0000000000000000
> [ 1937.770980][ T2787] x3 : ffffa00010a03bc8 x2 : 0000000000000001
> [ 1937.773041][ T2787] x1 : ffffa0001626d000 x0 : 0000000000000000
> [ 1937.775068][ T2787] Call trace:
> [ 1937.776252][ T2787]  sysfs_file_ops+0xd0/0xf0
> [ 1937.777785][ T2787]  sysfs_kf_seq_show+0x70/0x240
> [ 1937.779429][ T2787]  kernfs_seq_show+0xa8/0xc0
> [ 1937.781004][ T2787]  seq_read+0x350/0x860
> [ 1937.782437][ T2787]  kernfs_fop_read+0x94/0x3f8
> [ 1937.784013][ T2787]  __vfs_read+0x68/0xc8
> [ 1937.785456][ T2787]  vfs_read+0x15c/0x2b0
> [ 1937.786876][ T2787]  ksys_read+0x104/0x1e8
> [ 1937.788318][ T2787]  __arm64_sys_read+0x54/0x68
> [ 1937.789931][ T2787]  el0_svc_common.constprop.0+0x294/0x338
> [ 1937.791822][ T2787]  do_el0_svc+0xe8/0x108
> [ 1937.793287][ T2787]  el0_svc+0x74/0x88
> [ 1937.794656][ T2787]  el0_sync_handler+0xcc/0x77c
> [ 1937.796259][ T2787]  el0_sync+0x17c/0x180
> [ 1937.797758][ T2787] Code: b40000b3 97e8e4d9 91002260 97f6c841 (f9400673)
> [ 1937.800049][ T2787] ---[ end trace 8e9be5808e45ebb1 ]---
> [ 1937.801854][ T2787] Kernel panic - not syncing: Fatal exception
> [ 1937.803844][ T2787] Kernel Offset: disabled
> [ 1937.805325][ T2787] CPU features: 0x080002,20002004
> [ 1937.806961][ T2787] Memory Limit: none
> [ 1937.808349][ T2787] ---[ end Kernel panic - not syncing: Fatal exception ]---
> 
> and with the two patches applied I see this [2]:
> 
> node:test-bus:test-unittest0'
> [ 1839.107618][    T1] PM: Removing info for
> platform:testcase-data:overlay-node:test-bus:test-unittest0
> [ 1839.111218][    T1] kobject:
> 'testcase-data:overlay-node:test-bus:test-unittest0'
> ((____ptrval____)): kobject_uevent_env
> [ 1839.116021][    T1] kobject:
> 'testcase-data:overlay-node:test-bus:test-unittest0'
> ((____ptrval____)): fill_kobj_path: path =
> '/devices/platform/testcase-data:overlay-node:test-bus:test-unittest0'
> [ 1839.124287][    T1] kobject:
> 'testcase-data:overlay-node:test-bus:test-unittest0'
> ((____ptrval____)): kobject_release, parent (____ptrval____) (delayed
> 1000)
> [ 1839.130497][    T1] Unexpected kernel BRK exception at EL1
> [ 1839.132466][    T1] Internal error: ptrace BRK handler: f20003e8
> [#1] PREEMPT SMP
> [ 1839.134933][    T1] Modules linked in:
> [ 1839.136395][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B
> W       T 5.6.0-rc7-next-20200325-11882-ge7ffe3ef0d63 #1
> [ 1839.140051][    T1] Hardware name: linux,dummy-virt (DT)
> [ 1839.141976][    T1] pstate: 80400005 (Nzcv daif +PAN -UAO)
> [ 1839.143958][    T1] pc : of_unittest_untrack_overlay+0x6c/0x13c
> [ 1839.146026][    T1] lr : of_unittest_untrack_overlay+0x6c/0x13c
> [ 1839.148046][    T1] sp : ffff000069807af0
> [ 1839.149468][    T1] x29: ffff000069807af0 x28: ffffa00017258000
> [ 1839.151579][    T1] x27: ffffa00017258400 x26: 0000000000000000
> [ 1839.153635][    T1] x25: ffffa00017258480 x24: ffffa00013418a20
> [ 1839.155735][    T1] x23: 0000000000000000 x22: ffffa000152dc880
> [ 1839.157828][    T1] x21: 0000000000000000 x20: 00000000ffffffff
> [ 1839.160076][    T1] x19: 00000000ffffffff x18: 0000000000001ca0
> [ 1839.162198][    T1] x17: 00000000000019d8 x16: 0000000000001c60
> [ 1839.164321][    T1] x15: 00000000000019b8 x14: 616c65642820295f
> [ 1839.166388][    T1] x13: 5f5f5f6c61767274 x12: 705f5f5f5f282074
> [ 1839.168503][    T1] x11: 00000000f1f1f1f1 x10: ffff00006a3f8040
> [ 1839.170589][    T1] x9 : ffffa00013d6f370 x8 : 1ffff40002a5a688
> [ 1839.172686][    T1] x7 : ffff940002a5a688 x6 : dfffa00000000000
> [ 1839.174781][    T1] x5 : ffff00006a3f8040 x4 : 0000000000000000
> [ 1839.176871][    T1] x3 : ffffa00011f234ac x2 : 00000000ffffffff
> [ 1839.178947][    T1] x1 : ffff00006a3f8040 x0 : 0000000000000000
> [ 1839.181034][    T1] Call trace:
> [ 1839.182286][    T1]  of_unittest_untrack_overlay+0x6c/0x13c
> [ 1839.184295][    T1]  of_unittest+0x3330/0x3638
> [ 1839.185892][    T1]  do_one_initcall+0x480/0xa40
> [ 1839.187598][    T1]  kernel_init_freeable+0x794/0x95c
> [ 1839.189394][    T1]  kernel_init+0x20/0x1f8
> [ 1839.190924][    T1]  ret_from_fork+0x10/0x18
> [ 1839.192523][    T1] Code: 97955a2c d4210000 14000024 97955a29 (d4207d00)
> [ 1839.194889][    T1] ---[ end trace 39370fb7c4bf9e64 ]---
> [ 1839.196706][    T1] Kernel panic - not syncing: Fatal exception
> [ 1839.198735][    T1] Kernel Offset: disabled
> [ 1839.200246][    T1] CPU features: 0x080002,20002004
> [ 1839.201900][    T1] Memory Limit: none
> [ 1839.203340][    T1] ---[ end Kernel panic - not syncing: Fatal exception ]---

At least this time the call trace is inside the unittest code.  :-)

Can you send me the exact qemu command you use?

Can I do the qemu command without an initrd image?  If not, any pointers
to an arm64 initrd?

-Frank


> 
> Cheers,
> Anders
> [1] https://people.linaro.org/~anders.roxell/output-next-20200325.log
> [2] https://people.linaro.org/~anders.roxell/output-next-20200325.test.log
> 
>>
>> Thanks,
>>
>> Frank
>>
>>
>>>
>>> Can you please send the kernel .config?
>>>
>>> Thanks,
>>>
>>> Frank
>>>
>>>
>>>>
>>>> [...]
>>>> [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
>>>> [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
>>>> [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
>>>> [[0;32m  OK  [0m] Mounted Huge Pages File System.
>>>> [  172.917332][    T1] systemd[1]: Mounted Debug File System.
>>>> [[0;32m  OK  [0m] Mounted Debug File System.
>>>> [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
>>>> [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
>>>> [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
>>>> [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
>>>> [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
>>>> [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
>>>> [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
>>>> [  174.286169][  T240] Mem abort info:
>>>> [  174.303268][  T240]   ESR = 0x96000004
>>>> [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
>>>> [  174.323298][  T240]   SET = 0, FnV = 0
>>>> [  174.324677][  T240]   EA = 0, S1PTW = 0
>>>> [  174.325937][  T240] Data abort info:
>>>> [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
>>>> [  174.359310][  T240]   CM = 0, WnR = 0
>>>> [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
>>>> [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
>>>> [  174.381030][  T240] Modules linked in:
>>>> [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
>>>> [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
>>>> [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
>>>> [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
>>>> [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
>>>> [  174.393325][  T240] sp : ffff00006374faa0
>>>> [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040
>>>> [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000
>>>> [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010
>>>> [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800
>>>> [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008
>>>> [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000
>>>> [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000
>>>> [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000
>>>> [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800
>>>> [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff
>>>> [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000
>>>> [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f
>>>> [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d
>>>> [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001
>>>> [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000
>>>> [  174.424954][  T240] Call trace:
>>>> [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
>>>> [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
>>>> [  174.429306][  T240]  seq_read+0x3a4/0x8e8
>>>> [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
>>>> [  174.432244][  T240]  __vfs_read+0x64/0xc0
>>>> [  174.433622][  T240]  vfs_read+0x158/0x2b0
>>>> [  174.435014][  T240]  ksys_read+0xfc/0x1e0
>>>> [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
>>>> [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
>>>> [  174.439795][  T240]  do_el0_svc+0xe4/0x100
>>>> [  174.441218][  T240]  el0_svc+0x70/0x80
>>>> [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
>>>> [  174.444143][  T240]  el0_sync+0x164/0x180
>>>> [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355)
>>>> [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
>>>> [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
>>>> [  174.451590][  T240] Kernel Offset: disabled
>>>> [  174.453005][  T240] CPU features: 0x80002,20002004
>>>> [  174.454597][  T240] Memory Limit: none
>>>> [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
>>>>
>>>> When I say CONFIG_OF_UNITTEST=n it works.
>>>> If I revert there it starts to work when I revert the last one,
>>>> f4056e705b2e, from the list below:
>>>>
>>>> 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
>>>> 0ac174397940 of: unittest: annotate warnings triggered by unittest
>>>> f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
>>>>
>>>> Cheers,
>>>> Anders
>>>>
>>>>>> ---
>>>>>>
>>>>>> changes since v1:
>>>>>>   - base on 5.6-rc1
>>>>>>   - fixed node names in overlays
>>>>>>   - removed unused fields from struct unittest_gpio_dev
>>>>>>   - of_unittest_overlay_gpio() cleaned up comments
>>>>>>   - of_unittest_overlay_gpio() moved saving global values into
>>>>>>     probe_pass_count and chip_request_count more tightly around
>>>>>>     test code expected to trigger changes in the global values
>>>>>>
>>>>>> v1 of this patch incorrectly reported that it had made changes
>>>>>> since the RFC version, but it was mistakenly created from the
>>>>>> wrong branch.
>>>>>>
>>>>>> There are checkpatch warnings.
>>>>>>   - New files are in a directory already covered by MAINTAINERS
>>>>>>   - The undocumented compatibles are restricted to use by unittest
>>>>>>     and should not be documented under Documentation
>>>>>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
>>>>>>     is supplied by a define parameter instead of a hard coded constant
>>>>>>   - The lines over 80 characters are consistent with unittest.c style
>>>>>>
>>>>>> This unittest was also valuable in that it allowed me to explore
>>>>>> possible issues related to the proposed solution to the gpio hog
>>>>>> problem.
>>>>>>
>>>>>>
>>>>>>  drivers/of/unittest-data/Makefile             |   8 +-
>>>>>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
>>>>>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
>>>>>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
>>>>>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
>>>>>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
>>>>>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
>>>>>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
>>>>>>  8 files changed, 370 insertions(+), 1 deletion(-)
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
>>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
>>>>>>
>>>>>
>>>>> Applied, thanks.
>>>>>
>>>>> Rob
>>>>
>>>>
>>>
>>>
>>
> 

Re: [PATCH v2 1/2] of: unittest: add overlay gpio test to catch gpio hog problem

[Anders Roxell]

On Thu, 26 Mar 2020 at 16:33, Frank Rowand <frowand.list@gmail.com> wrote:
>
> Hi Anders,
>
> On 3/26/20 5:39 AM, Anders Roxell wrote:
> > On Thu, 26 Mar 2020 at 02:56, Frank Rowand <frowand.list@gmail.com> wrote:
> >>
> >> On 3/13/20 11:40 AM, Frank Rowand wrote:
> >>> Hi Anders,
> >>>
> >>> On 3/13/20 4:51 AM, Anders Roxell wrote:
> >>>> From: Rob Herring <robh@kernel.org>
> >>>>
> >>>>> On Thu, 20 Feb 2020 12:40:20 -0600, frowand.list@gmail.com wrote:
> >>>>>> From: Frank Rowand <frank.rowand@sony.com>
> >>>>>>
> >>>>>> Geert reports that gpio hog nodes are not properly processed when
> >>>>>> the gpio hog node is added via an overlay reply and provides an
> >>>>>> RFC patch to fix the problem [1].
> >>>>>>
> >>>>>> Add a unittest that shows the problem.  Unittest will report "1 failed"
> >>>>>> test before applying Geert's RFC patch and "0 failed" after applying
> >>>>>> Geert's RFC patch.
> >>>>>>
> >>>>>> [1] https://lore.kernel.org/linux-devicetree/20191230133852.5890-1-geert+renesas@glider.be/
> >>>>>>
> >>>>>> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> >>>>
> >>>> I'm building arm64 on tag next-20200312, and booting in qemu, and I see
> >>>> this "Kernel panic":
> >>>
> >>> Thank you for the panic report.
> >>>
> >>> There has also been an x86_64 failure (with a very different stack trace).
> >>> I am going to investigate the x86_64 failure first.
> >>
> >> I have fixed the x86_64 failure:
> >
> > Great.
> >
> >>
> >>    https://lore.kernel.org/linux-devicetree/1585187131-21642-1-git-send-email-frowand.list@gmail.com/
> >>
> >> Can you check if the two patches in that series fixes the problem that you
> >> are seeing?
> >
> > I got a new error instead.
> >
> > next-20200325 before I applied your patches [1]:
> >
> > [ 1933.602460][ T2795] random: get_random_u64 called from
> > arch_mmap_rnd+0x90/0xb8 with crng_init=1
> > [ 1933.602770][ T2795] random: get_random_u64 called from
> > randomize_stack_top+0x50/0xb8 with crng_init=1
> > [ 1933.603017][ T2795] random: get_random_u32 called from
> > arch_align_stack+0x70/0x90 with crng_init=1
> > [ 1936.391730][    T1] systemd[1]: Mounted Configuration File System.
> > [ [0;32m  OK   [0m] Mounted Configuration File System.
> > [ 1937.577008][ T2787] Unable to handle kernel paging request at
> > virtual address ccccccccccccccd4
> > [ 1937.604944][ T2787] Mem abort info:
> > [ 1937.622884][ T2787]   ESR = 0x96000004
> > [ 1937.624443][ T2787]   EC = 0x25: DABT (current EL), IL = 32 bits
> > [ 1937.651817][ T2787]   SET = 0, FnV = 0
> > [ 1937.672276][ T2787]   EA = 0, S1PTW = 0
> > [ 1937.679201][ T2787] Data abort info:
> > [ 1937.680594][ T2787]   ISV = 0, ISS = 0x00000004
> > [ 1937.705713][ T2787]   CM = 0, WnR = 0
> > [ 1937.707184][ T2787] [ccccccccccccccd4] address between user and
> > kernel address ranges
> > [ 1937.725628][ T2787] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> > [ 1937.727743][ T2787] Modules linked in:
> > [ 1937.729157][ T2787] CPU: 0 PID: 2787 Comm: systemd-journal Tainted:
> > G    B   W       T 5.6.0-rc7-next-20200325-11880-gbae0ebe545c5 #1
> > [ 1937.733403][ T2787] Hardware name: linux,dummy-virt (DT)
> > [ 1937.735393][ T2787] pstate: 40400005 (nZcv daif +PAN -UAO)
> > [ 1937.737480][ T2787] pc : sysfs_file_ops+0xd0/0xf0
> > [ 1937.739292][ T2787] lr : sysfs_file_ops+0xd0/0xf0
> > [ 1937.741052][ T2787] sp : ffff000062287a80
> > [ 1937.742614][ T2787] x29: ffff000062287a80 x28: ffff000060868040
> > [ 1937.744875][ T2787] x27: ffff000068553810 x26: ffff000062287d80
> > [ 1937.747164][ T2787] x25: ffff00006263b200 x24: ffff000068415528
> > [ 1937.749355][ T2787] x23: ffff000068415538 x22: 0000000000000001
> > [ 1937.751610][ T2787] x21: ffff000068553810 x20: 0000000000000000
> > [ 1937.753908][ T2787] x19: cccccccccccccccc x18: 0000000000007ec0
> > [ 1937.756130][ T2787] x17: 0000000000002208 x16: 0000000000001650
> > [ 1937.758384][ T2787] x15: 0000000000000000 x14: 0000000000000000
> > [ 1937.760481][ T2787] x13: 0000000000000000 x12: 0000000000002240
> > [ 1937.762720][ T2787] x11: 00000000f1f1f1f1 x10: ffff000060868040
> > [ 1937.764810][ T2787] x9 : ffffa00010a03d28 x8 : 1fffe0000c3c2730
> > [ 1937.766856][ T2787] x7 : ffff80000c3c2730 x6 : dfffa00000000000
> > [ 1937.768926][ T2787] x5 : ffff000060868040 x4 : 0000000000000000
> > [ 1937.770980][ T2787] x3 : ffffa00010a03bc8 x2 : 0000000000000001
> > [ 1937.773041][ T2787] x1 : ffffa0001626d000 x0 : 0000000000000000
> > [ 1937.775068][ T2787] Call trace:
> > [ 1937.776252][ T2787]  sysfs_file_ops+0xd0/0xf0
> > [ 1937.777785][ T2787]  sysfs_kf_seq_show+0x70/0x240
> > [ 1937.779429][ T2787]  kernfs_seq_show+0xa8/0xc0
> > [ 1937.781004][ T2787]  seq_read+0x350/0x860
> > [ 1937.782437][ T2787]  kernfs_fop_read+0x94/0x3f8
> > [ 1937.784013][ T2787]  __vfs_read+0x68/0xc8
> > [ 1937.785456][ T2787]  vfs_read+0x15c/0x2b0
> > [ 1937.786876][ T2787]  ksys_read+0x104/0x1e8
> > [ 1937.788318][ T2787]  __arm64_sys_read+0x54/0x68
> > [ 1937.789931][ T2787]  el0_svc_common.constprop.0+0x294/0x338
> > [ 1937.791822][ T2787]  do_el0_svc+0xe8/0x108
> > [ 1937.793287][ T2787]  el0_svc+0x74/0x88
> > [ 1937.794656][ T2787]  el0_sync_handler+0xcc/0x77c
> > [ 1937.796259][ T2787]  el0_sync+0x17c/0x180
> > [ 1937.797758][ T2787] Code: b40000b3 97e8e4d9 91002260 97f6c841 (f9400673)
> > [ 1937.800049][ T2787] ---[ end trace 8e9be5808e45ebb1 ]---
> > [ 1937.801854][ T2787] Kernel panic - not syncing: Fatal exception
> > [ 1937.803844][ T2787] Kernel Offset: disabled
> > [ 1937.805325][ T2787] CPU features: 0x080002,20002004
> > [ 1937.806961][ T2787] Memory Limit: none
> > [ 1937.808349][ T2787] ---[ end Kernel panic - not syncing: Fatal exception ]---
> >
> > and with the two patches applied I see this [2]:
> >
> > node:test-bus:test-unittest0'
> > [ 1839.107618][    T1] PM: Removing info for
> > platform:testcase-data:overlay-node:test-bus:test-unittest0
> > [ 1839.111218][    T1] kobject:
> > 'testcase-data:overlay-node:test-bus:test-unittest0'
> > ((____ptrval____)): kobject_uevent_env
> > [ 1839.116021][    T1] kobject:
> > 'testcase-data:overlay-node:test-bus:test-unittest0'
> > ((____ptrval____)): fill_kobj_path: path =
> > '/devices/platform/testcase-data:overlay-node:test-bus:test-unittest0'
> > [ 1839.124287][    T1] kobject:
> > 'testcase-data:overlay-node:test-bus:test-unittest0'
> > ((____ptrval____)): kobject_release, parent (____ptrval____) (delayed
> > 1000)
> > [ 1839.130497][    T1] Unexpected kernel BRK exception at EL1
> > [ 1839.132466][    T1] Internal error: ptrace BRK handler: f20003e8
> > [#1] PREEMPT SMP
> > [ 1839.134933][    T1] Modules linked in:
> > [ 1839.136395][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G    B
> > W       T 5.6.0-rc7-next-20200325-11882-ge7ffe3ef0d63 #1
> > [ 1839.140051][    T1] Hardware name: linux,dummy-virt (DT)
> > [ 1839.141976][    T1] pstate: 80400005 (Nzcv daif +PAN -UAO)
> > [ 1839.143958][    T1] pc : of_unittest_untrack_overlay+0x6c/0x13c
> > [ 1839.146026][    T1] lr : of_unittest_untrack_overlay+0x6c/0x13c
> > [ 1839.148046][    T1] sp : ffff000069807af0
> > [ 1839.149468][    T1] x29: ffff000069807af0 x28: ffffa00017258000
> > [ 1839.151579][    T1] x27: ffffa00017258400 x26: 0000000000000000
> > [ 1839.153635][    T1] x25: ffffa00017258480 x24: ffffa00013418a20
> > [ 1839.155735][    T1] x23: 0000000000000000 x22: ffffa000152dc880
> > [ 1839.157828][    T1] x21: 0000000000000000 x20: 00000000ffffffff
> > [ 1839.160076][    T1] x19: 00000000ffffffff x18: 0000000000001ca0
> > [ 1839.162198][    T1] x17: 00000000000019d8 x16: 0000000000001c60
> > [ 1839.164321][    T1] x15: 00000000000019b8 x14: 616c65642820295f
> > [ 1839.166388][    T1] x13: 5f5f5f6c61767274 x12: 705f5f5f5f282074
> > [ 1839.168503][    T1] x11: 00000000f1f1f1f1 x10: ffff00006a3f8040
> > [ 1839.170589][    T1] x9 : ffffa00013d6f370 x8 : 1ffff40002a5a688
> > [ 1839.172686][    T1] x7 : ffff940002a5a688 x6 : dfffa00000000000
> > [ 1839.174781][    T1] x5 : ffff00006a3f8040 x4 : 0000000000000000
> > [ 1839.176871][    T1] x3 : ffffa00011f234ac x2 : 00000000ffffffff
> > [ 1839.178947][    T1] x1 : ffff00006a3f8040 x0 : 0000000000000000
> > [ 1839.181034][    T1] Call trace:
> > [ 1839.182286][    T1]  of_unittest_untrack_overlay+0x6c/0x13c
> > [ 1839.184295][    T1]  of_unittest+0x3330/0x3638
> > [ 1839.185892][    T1]  do_one_initcall+0x480/0xa40
> > [ 1839.187598][    T1]  kernel_init_freeable+0x794/0x95c
> > [ 1839.189394][    T1]  kernel_init+0x20/0x1f8
> > [ 1839.190924][    T1]  ret_from_fork+0x10/0x18
> > [ 1839.192523][    T1] Code: 97955a2c d4210000 14000024 97955a29 (d4207d00)
> > [ 1839.194889][    T1] ---[ end trace 39370fb7c4bf9e64 ]---
> > [ 1839.196706][    T1] Kernel panic - not syncing: Fatal exception
> > [ 1839.198735][    T1] Kernel Offset: disabled
> > [ 1839.200246][    T1] CPU features: 0x080002,20002004
> > [ 1839.201900][    T1] Memory Limit: none
> > [ 1839.203340][    T1] ---[ end Kernel panic - not syncing: Fatal exception ]---
>

I'm sorry for the late reply. =/

> At least this time the call trace is inside the unittest code.  :-)

yeah =)

>
> Can you send me the exact qemu command you use?

sudo qemu-system-aarch64 --enable-kvm -cpu cortex-a53 -kernel
Image-20200408 -serial stdio -monitor none -nographic -m 2G -M virt
-fsdev local,id=root,path=/srv/kvm/tmp/stretch/arm64,security_model=none,writeout=immediate
-device virtio-rng-pci -device
virtio-9p-pci,fsdev=root,mount_tag=/dev/root -append "root=/dev/root
rootfstype=9p rootflags=trans=virtio console=ttyA
MA0,38400n8 earlycon=pl011,0x9000000 initcall_debug softlockup_panic=0
security=none kpti=no"

>
> Can I do the qemu command without an initrd image?  If not, any pointers
> to an arm64 initrd?

I used debootstrap

sudo qemu-debootstrap --arch=arm64 stretch /srv/kvm/tmp/stretch/arm64
http://ftp.de.debian.org/debian/
echo "/dev/root / 9p
rw,relatime,sync,dirsync,access=client,trans=virtio 1 1" | sudo tee
/srv/kvm/tmp/stretch/arm64/etc/fstab
sudo chroot /srv/kvm/tmp/stretch/arm64 passwd

Cheers,
Anders

>
> -Frank
>
>
> >
> > Cheers,
> > Anders
> > [1] https://people.linaro.org/~anders.roxell/output-next-20200325.log
> > [2] https://people.linaro.org/~anders.roxell/output-next-20200325.test.log
> >
> >>
> >> Thanks,
> >>
> >> Frank
> >>
> >>
> >>>
> >>> Can you please send the kernel .config?
> >>>
> >>> Thanks,
> >>>
> >>> Frank
> >>>
> >>>
> >>>>
> >>>> [...]
> >>>> [  172.779435][    T1] systemd[1]: Mounted POSIX Message Queue File System.
> >>>> [[0;32m  OK  [0m] Mounted POSIX Message Queue File System.
> >>>> [  172.844551][    T1] systemd[1]: Mounted Huge Pages File System.
> >>>> [[0;32m  OK  [0m] Mounted Huge Pages File System.
> >>>> [  172.917332][    T1] systemd[1]: Mounted Debug File System.
> >>>> [[0;32m  OK  [0m] Mounted Debug File System.
> >>>> [  173.465694][  T251] _warn_unseeded_randomness: 6 callbacks suppressed
> >>>> [  173.465803][  T251] random: get_random_u64 called from arch_mmap_rnd+0x94/0xb0 with crng_init=1
> >>>> [  173.466000][  T251] random: get_random_u64 called from randomize_stack_top+0x4c/0xb0 with crng_init=1
> >>>> [  173.466163][  T251] random: get_random_u32 called from arch_align_stack+0x6c/0x88 with crng_init=1
> >>>> [  173.544157][    T1] systemd[1]: Started Create Static Device Nodes in /dev.
> >>>> [[0;32m  OK  [0m] Started Create Static Device Nodes in /dev.
> >>>> [  174.283422][  T240] Unable to handle kernel paging request at virtual address 978061b552800000
> >>>> [  174.286169][  T240] Mem abort info:
> >>>> [  174.303268][  T240]   ESR = 0x96000004
> >>>> [  174.304652][  T240]   EC = 0x25: DABT (current EL), IL = 32 bits
> >>>> [  174.323298][  T240]   SET = 0, FnV = 0
> >>>> [  174.324677][  T240]   EA = 0, S1PTW = 0
> >>>> [  174.325937][  T240] Data abort info:
> >>>> [  174.345383][  T240]   ISV = 0, ISS = 0x00000004
> >>>> [  174.359310][  T240]   CM = 0, WnR = 0
> >>>> [  174.360641][  T240] [978061b552800000] address between user and kernel address ranges
> >>>> [  174.378712][  T240] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> >>>> [  174.381030][  T240] Modules linked in:
> >>>> [  174.382362][  T240] CPU: 0 PID: 240 Comm: systemd-journal Tainted: G    B   W         5.6.0-rc5-next-20200312-00018-g5c00c2e7cf27 #6
> >>>> [  174.386251][  T240] Hardware name: linux,dummy-virt (DT)
> >>>> [  174.388056][  T240] pstate: 40400005 (nZcv daif +PAN -UAO)
> >>>> [  174.389892][  T240] pc : sysfs_kf_seq_show+0x114/0x250
> >>>> [  174.391638][  T240] lr : sysfs_kf_seq_show+0x114/0x250
> >>>> [  174.393325][  T240] sp : ffff00006374faa0
> >>>> [  174.394697][  T240] x29: ffff00006374faa0 x28: ffff000062620040
> >>>> [  174.396751][  T240] x27: ffff000062b0a010 x26: 978061b552800000
> >>>> [  174.398779][  T240] x25: ffff000068aae020 x24: ffff000068aae010
> >>>> [  174.400798][  T240] x23: ffff00006311c000 x22: ffff000064f4f800
> >>>> [  174.402794][  T240] x21: 0000000000001000 x20: ffff000068aae008
> >>>> [  174.404820][  T240] x19: 0000000000001000 x18: 0000000000000000
> >>>> [  174.406792][  T240] x17: 0000000000000000 x16: 0000000000000000
> >>>> [  174.408814][  T240] x15: 0000000000000000 x14: 0000000000000000
> >>>> [  174.410805][  T240] x13: ffff80000c623a00 x12: 1fffe0000c623800
> >>>> [  174.412829][  T240] x11: 1fffe0000c6239ff x10: ffff80000c6239ff
> >>>> [  174.414821][  T240] x9 : 0000000000000000 x8 : ffff00006311d000
> >>>> [  174.416865][  T240] x7 : 0000000000000000 x6 : 000000000000003f
> >>>> [  174.418907][  T240] x5 : 0000000000000040 x4 : 000000000000002d
> >>>> [  174.420932][  T240] x3 : ffffa000109a1274 x2 : 0000000000000001
> >>>> [  174.422924][  T240] x1 : ffffa00016010000 x0 : 0000000000000000
> >>>> [  174.424954][  T240] Call trace:
> >>>> [  174.426097][  T240]  sysfs_kf_seq_show+0x114/0x250
> >>>> [  174.427769][  T240]  kernfs_seq_show+0xa4/0xb8
> >>>> [  174.429306][  T240]  seq_read+0x3a4/0x8e8
> >>>> [  174.430678][  T240]  kernfs_fop_read+0x8c/0x6e0
> >>>> [  174.432244][  T240]  __vfs_read+0x64/0xc0
> >>>> [  174.433622][  T240]  vfs_read+0x158/0x2b0
> >>>> [  174.435014][  T240]  ksys_read+0xfc/0x1e0
> >>>> [  174.436427][  T240]  __arm64_sys_read+0x50/0x60
> >>>> [  174.437944][  T240]  el0_svc_common.constprop.1+0x294/0x330
> >>>> [  174.439795][  T240]  do_el0_svc+0xe4/0x100
> >>>> [  174.441218][  T240]  el0_svc+0x70/0x80
> >>>> [  174.442550][  T240]  el0_sync_handler+0xd0/0x7b4
> >>>> [  174.444143][  T240]  el0_sync+0x164/0x180
> >>>> [  174.445578][  T240] Code: aa1703e0 97f6e03a aa1a03e0 97f6e880 (f9400355)
> >>>> [  174.447885][  T240] ---[ end trace 5bcb796ff4270d74 ]---
> >>>> [  174.449629][  T240] Kernel panic - not syncing: Fatal exception
> >>>> [  174.451590][  T240] Kernel Offset: disabled
> >>>> [  174.453005][  T240] CPU features: 0x80002,20002004
> >>>> [  174.454597][  T240] Memory Limit: none
> >>>> [  174.455955][  T240] ---[ end Kernel panic - not syncing: Fatal exception ]---
> >>>>
> >>>> When I say CONFIG_OF_UNITTEST=n it works.
> >>>> If I revert there it starts to work when I revert the last one,
> >>>> f4056e705b2e, from the list below:
> >>>>
> >>>> 485bb19d0b3e of: unittest: make gpio overlay test dependent on CONFIG_OF_GPIO
> >>>> 0ac174397940 of: unittest: annotate warnings triggered by unittest
> >>>> f4056e705b2e of: unittest: add overlay gpio test to catch gpio hog problem
> >>>>
> >>>> Cheers,
> >>>> Anders
> >>>>
> >>>>>> ---
> >>>>>>
> >>>>>> changes since v1:
> >>>>>>   - base on 5.6-rc1
> >>>>>>   - fixed node names in overlays
> >>>>>>   - removed unused fields from struct unittest_gpio_dev
> >>>>>>   - of_unittest_overlay_gpio() cleaned up comments
> >>>>>>   - of_unittest_overlay_gpio() moved saving global values into
> >>>>>>     probe_pass_count and chip_request_count more tightly around
> >>>>>>     test code expected to trigger changes in the global values
> >>>>>>
> >>>>>> v1 of this patch incorrectly reported that it had made changes
> >>>>>> since the RFC version, but it was mistakenly created from the
> >>>>>> wrong branch.
> >>>>>>
> >>>>>> There are checkpatch warnings.
> >>>>>>   - New files are in a directory already covered by MAINTAINERS
> >>>>>>   - The undocumented compatibles are restricted to use by unittest
> >>>>>>     and should not be documented under Documentation
> >>>>>>   - The printk() KERN_<LEVEL> warnings are false positives.  The level
> >>>>>>     is supplied by a define parameter instead of a hard coded constant
> >>>>>>   - The lines over 80 characters are consistent with unittest.c style
> >>>>>>
> >>>>>> This unittest was also valuable in that it allowed me to explore
> >>>>>> possible issues related to the proposed solution to the gpio hog
> >>>>>> problem.
> >>>>>>
> >>>>>>
> >>>>>>  drivers/of/unittest-data/Makefile             |   8 +-
> >>>>>>  drivers/of/unittest-data/overlay_gpio_01.dts  |  23 +++
> >>>>>>  drivers/of/unittest-data/overlay_gpio_02a.dts |  16 ++
> >>>>>>  drivers/of/unittest-data/overlay_gpio_02b.dts |  16 ++
> >>>>>>  drivers/of/unittest-data/overlay_gpio_03.dts  |  23 +++
> >>>>>>  drivers/of/unittest-data/overlay_gpio_04a.dts |  16 ++
> >>>>>>  drivers/of/unittest-data/overlay_gpio_04b.dts |  16 ++
> >>>>>>  drivers/of/unittest.c                         | 253 ++++++++++++++++++++++++++
> >>>>>>  8 files changed, 370 insertions(+), 1 deletion(-)
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_01.dts
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02a.dts
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_02b.dts
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_03.dts
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04a.dts
> >>>>>>  create mode 100644 drivers/of/unittest-data/overlay_gpio_04b.dts
> >>>>>>
> >>>>>
> >>>>> Applied, thanks.
> >>>>>
> >>>>> Rob
> >>>>
> >>>>
> >>>
> >>>
> >>
> >
>