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perf: Fix mmap_page::offset computation 

There's multiple reason the counter might be unavailable, change the
condition to !->index since perf_event_index() should return 0 for all
those cases.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-1ixr3olci40w8rgv2evv2ldh@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2011-11-21 20:58:59 +01:00 committed by Ingo Molnar
parent 35edc2a509
commit 365a403848
1 changed files with 1 additions and 1 deletions
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2
kernel/events/core.c
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@ -3268,7 +3268,7 @@ void perf_event_update_userpage(struct perf_event *event)
barrier();
userpg->index = perf_event_index(event);
userpg->offset = perf_event_count(event);
if (event->state == PERF_EVENT_STATE_ACTIVE)
if (userpg->index)
userpg->offset -= local64_read(&event->hw.prev_count);
userpg->time_enabled = enabled +