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From: Peter Zijlstra on 24 Jun 2010 10:40
From: David S. Miller <davem(a)davemloft.net>

Need to mask out the existing event bits before OR'ing in
the new ones.

Reported-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
Signed-off-by: David S. Miller <davem(a)davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra(a)chello.nl>
---
arch/sparc/kernel/perf_event.c | 1 +
1 file changed, 1 insertion(+)

Index: linux-2.6/arch/sparc/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/arch/sparc/kernel/perf_event.c
+++ linux-2.6/arch/sparc/kernel/perf_event.c
@@ -657,6 +657,7 @@ static u64 maybe_change_configuration(st
cpuc->current_idx[i] = idx;

enc = perf_event_get_enc(cpuc->events[i]);
+ pcr &= ~mask_for_index(idx);
pcr |= event_encoding(enc, idx);
}
out:


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Prev: [PATCH 01/11] perf, x86: Fix Nehalem PMU quirk
Next: [RFC][PATCH 04/11] perf: deconstify struct pmu