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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull perf fix from Ingo Molnar:
 "An x86/intel event constraint fix"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86: Fix constraint table end marker bug
This commit is contained in:
Linus Torvalds 2013-12-17 12:35:05 -08:00
parent 0eda4020ae cf30d52e2d
commit 1070d5ac19
1 changed files with 12 additions and 3 deletions
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15
arch/x86/kernel/cpu/perf_event.h
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@ -262,11 +262,20 @@ struct cpu_hw_events {
__EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVENT_MASK, \
HWEIGHT(n), 0, PERF_X86_EVENT_PEBS_ST_HSW)
#define EVENT_CONSTRAINT_END \
EVENT_CONSTRAINT(0, 0, 0)
/*
* We define the end marker as having a weight of -1
* to enable blacklisting of events using a counter bitmask
* of zero and thus a weight of zero.
* The end marker has a weight that cannot possibly be
* obtained from counting the bits in the bitmask.
*/
#define EVENT_CONSTRAINT_END { .weight = -1 }
/*
* Check for end marker with weight == -1
*/
#define for_each_event_constraint(e, c) \
for ((e) = (c); (e)->weight; (e)++)
for ((e) = (c); (e)->weight != -1; (e)++)
/*
* Extra registers for specific events.