perf: Fix PERF_EVENT_IOC_PERIOD migration race

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[ Upstream commit c7999c6f3f ]

I ran the perf fuzzer, which triggered some WARN()s which are due to
trying to stop/restart an event on the wrong CPU.

Use the normal IPI pattern to ensure we run the code on the correct CPU.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: bad7192b84 ("perf: Fix PERF_EVENT_IOC_PERIOD to force-reset the period")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Peter Zijlstra 2015-08-04 19:22:49 +02:00 • committed by Sasha Levin

parent c08266ad1a

commit a19bd3d535

1 changed files with 55 additions and 20 deletions

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kernel/events/core.c

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