perf: Avoid RCU vs preemption assumptions

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The per-pmu per-cpu context patch converted things from
get_cpu_var() to this_cpu_ptr(), but that only works if
rcu_read_lock() actually disables preemption, and since
there is no such guarantee, we need to fix that.

Use the newly introduced {get,put}_cpu_ptr().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
LKML-Reference: <20100917093009.308453028@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Peter Zijlstra 2010-09-16 19:17:24 +02:00 • committed by Ingo Molnar

parent 8b8e2ec1ee

commit 41945f6ccf

1 changed files with 12 additions and 6 deletions

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kernel/perf_event.c

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