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perf_events, x86: Remove spurious counter reset from x86_pmu_enable()

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At enable time the counter might still have a ->idx pointing to
a previously occupied location that might now be taken by
another event. Resetting the counter at that location with data
from this event will destroy the other counter's count.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <20100127221122.261477183@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-01-27 23:07:49 +01:00 committed by Ingo Molnar
parent 452a339a97
commit 18c01f8abf
1 changed files with 0 additions and 3 deletions
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arch/x86/kernel/cpu/perf_event.c
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@ -1762,9 +1762,6 @@ static int x86_pmu_enable(struct perf_event *event)
cpuc->n_events = n;
cpuc->n_added = n - n0;
if (hwc->idx != -1)
x86_perf_event_set_period(event, hwc, hwc->idx);
return 0;
}