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perf, x86: Use weight instead of cmask in for_each_event_constraint()

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There may exist constraints with a cmask set to zero. In this case
for_each_event_constraint() will not work properly. Now weight is used
instead of the cmask for loop exit detection. Weight is always a value
other than zero since the default contains the HWEIGHT from the
counter mask and in other cases a value of zero does not fit too.

This is in preparation of ibs event constraints that wont have a
cmask.

Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1271190201-25705-7-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Richter 2010-04-13 22:23:15 +02:00 committed by Ingo Molnar
parent 31fa58af57
commit a1f2b70a94
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/cpu/perf_event.c
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@ -170,7 +170,7 @@ struct cpu_hw_events {
EVENT_CONSTRAINT(0, 0, 0)
#define for_each_event_constraint(e, c) \
for ((e) = (c); (e)->cmask; (e)++)
for ((e) = (c); (e)->weight; (e)++)
union perf_capabilities {
struct {