perf: Fix PERF_EVENT_IOC_PERIOD migration race
authorPeter Zijlstra <peterz@infradead.org>
Tue, 4 Aug 2015 17:22:49 +0000 (19:22 +0200)
committerIngo Molnar <mingo@kernel.org>
Wed, 12 Aug 2015 09:37:22 +0000 (11:37 +0200)
commitc7999c6f3fed9e383d3131474588f282ae6d56b9
treeecd84ef16259aedf4343b5b908eec40953c696d8
parentee9397a6fb9bc4e52677f5e33eed4abee0f515e6
perf: Fix PERF_EVENT_IOC_PERIOD migration race

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: bad7192b842c ("perf: Fix PERF_EVENT_IOC_PERIOD to force-reset the period")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
kernel/events/core.c