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linux/tools/testing/selftests/breakpoints
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Moon Hee Lee 11be9a6e34 selftests: breakpoints: use suspend_stats to reliably check suspend success 
[ Upstream commit 07b7c2b4ec ]

The step_after_suspend_test verifies that the system successfully
suspended and resumed by setting a timerfd and checking whether the
timer fully expired. However, this method is unreliable due to timing
races.

In practice, the system may take time to enter suspend, during which the
timer may expire just before or during the transition. As a result,
the remaining time after resume may show non-zero nanoseconds, even if
suspend/resume completed successfully. This leads to false test failures.

Replace the timer-based check with a read from
/sys/power/suspend_stats/success. This counter is incremented only
after a full suspend/resume cycle, providing a reliable and race-free
indicator.

Also remove the unused file descriptor for /sys/power/state, which
remained after switching to a system() call to trigger suspend [1].

[1] https://lore.kernel.org/all/20240930224025.2858767-1-yifei.l.liu@oracle.com/

Link: https://lore.kernel.org/r/20250626191626.36794-1-moonhee.lee.ca@gmail.com
Fixes: c66be905cd ("selftests: breakpoints: use remaining time to check if suspend succeed")
Signed-off-by: Moon Hee Lee <moonhee.lee.ca@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-08-15 12:13:36 +02:00
..
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
breakpoint_test.c selftests:breakpoints: Fix Format String Warning in breakpoint_test 2023-11-30 14:32:28 -07:00
breakpoint_test_arm64.c selftests: breakpoints: Use correct error messages in breakpoint_test_arm64.c 2021-02-08 17:04:41 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
step_after_suspend_test.c selftests: breakpoints: use suspend_stats to reliably check suspend success 2025-08-15 12:13:36 +02:00