From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- lib/kunit/backtrace-suppression-test.c | 198 +++++++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) create mode 100644 lib/kunit/backtrace-suppression-test.c (limited to 'lib/kunit/backtrace-suppression-test.c') diff --git a/lib/kunit/backtrace-suppression-test.c b/lib/kunit/backtrace-suppression-test.c new file mode 100644 index 000000000..7a2a59c6a --- /dev/null +++ b/lib/kunit/backtrace-suppression-test.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for suppressing warning tracebacks. + * + * Copyright (C) 2024, Guenter Roeck + * Author: Guenter Roeck + */ + +#include +#include +#include +#include + +static void backtrace_suppression_test_warn_direct(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + + kunit_warning_suppress(test) { + WARN(1, "This backtrace should be suppressed"); + /* + * Count must be checked inside the scope; the handle + * is not accessible after the block exits. + */ + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 1); + } + KUNIT_EXPECT_FALSE(test, kunit_has_active_suppress_warning()); +} + +static noinline void trigger_backtrace_warn(void) +{ + WARN(1, "This backtrace should be suppressed"); +} + +static void backtrace_suppression_test_warn_indirect(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + + kunit_warning_suppress(test) { + trigger_backtrace_warn(); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 1); + } +} + +static void backtrace_suppression_test_warn_multi(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + + kunit_warning_suppress(test) { + WARN(1, "This backtrace should be suppressed"); + trigger_backtrace_warn(); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 2); + } +} + +static void backtrace_suppression_test_warn_on_direct(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + if (!IS_ENABLED(CONFIG_DEBUG_BUGVERBOSE) && !IS_ENABLED(CONFIG_KALLSYMS)) + kunit_skip(test, "requires CONFIG_DEBUG_BUGVERBOSE or CONFIG_KALLSYMS"); + + kunit_warning_suppress(test) { + WARN_ON(1); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 1); + } +} + +static noinline void trigger_backtrace_warn_on(void) +{ + WARN_ON(1); +} + +static void backtrace_suppression_test_warn_on_indirect(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + if (!IS_ENABLED(CONFIG_DEBUG_BUGVERBOSE)) + kunit_skip(test, "requires CONFIG_DEBUG_BUGVERBOSE"); + + kunit_warning_suppress(test) { + trigger_backtrace_warn_on(); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 1); + } +} + +static void backtrace_suppression_test_count(struct kunit *test) +{ + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + + kunit_warning_suppress(test) { + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 0); + + WARN(1, "suppressed"); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 1); + + WARN(1, "suppressed again"); + KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, 2); + } +} + +static void backtrace_suppression_test_active_state(struct kunit *test) +{ + KUNIT_EXPECT_FALSE(test, kunit_has_active_suppress_warning()); + + kunit_warning_suppress(test) { + KUNIT_EXPECT_TRUE(test, kunit_has_active_suppress_warning()); + } + + KUNIT_EXPECT_FALSE(test, kunit_has_active_suppress_warning()); + + kunit_warning_suppress(test) { + KUNIT_EXPECT_TRUE(test, kunit_has_active_suppress_warning()); + } + + KUNIT_EXPECT_FALSE(test, kunit_has_active_suppress_warning()); +} + +static void backtrace_suppression_test_multi_scope(struct kunit *test) +{ + struct kunit_suppressed_warning *sw1, *sw2; + + if (!IS_ENABLED(CONFIG_BUG)) + kunit_skip(test, "requires CONFIG_BUG"); + if (!IS_ENABLED(CONFIG_DEBUG_BUGVERBOSE)) + kunit_skip(test, "requires CONFIG_DEBUG_BUGVERBOSE"); + + sw1 = kunit_start_suppress_warning(test); + trigger_backtrace_warn_on(); + WARN(1, "suppressed by sw1"); + kunit_end_suppress_warning(test, sw1); + + sw2 = kunit_start_suppress_warning(test); + WARN(1, "suppressed by sw2"); + kunit_end_suppress_warning(test, sw2); + + KUNIT_EXPECT_EQ(test, kunit_suppressed_warning_count(sw1), 2); + KUNIT_EXPECT_EQ(test, kunit_suppressed_warning_count(sw2), 1); +} + +struct cross_kthread_data { + bool was_active; + struct completion done; +}; + +static int cross_kthread_fn(void *data) +{ + struct cross_kthread_data *d = data; + + d->was_active = kunit_has_active_suppress_warning(); + complete(&d->done); + while (!kthread_should_stop()) + schedule(); + return 0; +} + +static void backtrace_suppression_test_cross_kthread(struct kunit *test) +{ + struct cross_kthread_data data; + struct task_struct *task; + + data.was_active = false; + init_completion(&data.done); + + kunit_warning_suppress(test) { + task = kthread_run(cross_kthread_fn, &data, "kunit-cross-test"); + KUNIT_ASSERT_FALSE(test, IS_ERR(task)); + wait_for_completion(&data.done); + kthread_stop(task); + } + + KUNIT_EXPECT_FALSE(test, data.was_active); +} + +static struct kunit_case backtrace_suppression_test_cases[] = { + KUNIT_CASE(backtrace_suppression_test_warn_direct), + KUNIT_CASE(backtrace_suppression_test_warn_indirect), + KUNIT_CASE(backtrace_suppression_test_warn_multi), + KUNIT_CASE(backtrace_suppression_test_warn_on_direct), + KUNIT_CASE(backtrace_suppression_test_warn_on_indirect), + KUNIT_CASE(backtrace_suppression_test_count), + KUNIT_CASE(backtrace_suppression_test_active_state), + KUNIT_CASE(backtrace_suppression_test_multi_scope), + KUNIT_CASE(backtrace_suppression_test_cross_kthread), + {} +}; + +static struct kunit_suite backtrace_suppression_test_suite = { + .name = "backtrace-suppression-test", + .test_cases = backtrace_suppression_test_cases, +}; +kunit_test_suites(&backtrace_suppression_test_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("KUnit test to verify warning backtrace suppression"); 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