diff options
| author | Li Huafei <lihuafei1@huawei.com> | 2024-10-21 22:30:04 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-03-06 14:07:39 +0300 |
| commit | 05763885e327f0e257ee8b96b30ac1b95f7dd532 (patch) | |
| tree | 90d8530b5d4c8fa44ae11d88fa6386256243e951 | |
| parent | d6834d9c990333bfa433bc1816e2417f268eebbe (diff) | |
| download | linux-05763885e327f0e257ee8b96b30ac1b95f7dd532.tar.xz | |
watchdog/hardlockup/perf: Warn if watchdog_ev is leaked
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
| -rw-r--r-- | kernel/watchdog_perf.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/watchdog_perf.c b/kernel/watchdog_perf.c index 2fdb96eaf493..a78ff092d636 100644 --- a/kernel/watchdog_perf.c +++ b/kernel/watchdog_perf.c @@ -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; } |