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watchdog/hardlockup/perf: Warn if watchdog_ev is leaked

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When creating a new perf_event for the hardlockup watchdog, it should not
happen that the old perf_event is not released.

Introduce a WARN_ONCE() that should never trigger.

[ mingo: Changed the type of the warning to WARN_ONCE(). ]

Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241021193004.308303-2-lihuafei1@huawei.com
This commit is contained in:
Li Huafei
2024-10-22 03:30:04 +08:00
committed by Ingo Molnar
parent d6834d9c99
commit 05763885e3
1 changed files with 1 additions and 0 deletions
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kernel/watchdog_perf.c
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@@ -144,6 +144,7 @@ static int hardlockup_detector_event_create(void)
PTR_ERR(evt));
return PTR_ERR(evt);
}
WARN_ONCE(this_cpu_read(watchdog_ev), "unexpected watchdog_ev leak");
this_cpu_write(watchdog_ev, evt);
return 0;
}