tree b42abb2d44ed771759eee63ce00378df02d689ca
parent 9ffdc6c37df131f89d52001e0ef03091b158826f
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1296052715 +0100
committer Ingo Molnar <mingo@elte.hu> 1296731746 +0100

perf: Fix reading in perf_event_read()

It is quite possible for the event to have been disabled between
perf_event_read() sending the IPI and the CPU servicing the IPI and
calling __perf_event_read(), hence revalidate the state.

Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>