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bitops: Ensure the compile time HWEIGHT is only used for such

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Avoid accidental misuse by failing to compile things

Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-01-29 13:25:12 +01:00
committed by Ingo Molnar
parent 8c48e44419
commit fce877e3a4
2 changed files with 29 additions and 14 deletions
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10
arch/x86/kernel/cpu/perf_event.c
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@@ -93,13 +93,16 @@ struct cpu_hw_events {
struct perf_event *event_list[X86_PMC_IDX_MAX]; /* in enabled order */
};
#define EVENT_CONSTRAINT(c, n, m) { \
#define __EVENT_CONSTRAINT(c, n, m, w) {\
{ .idxmsk64[0] = (n) }, \
.code = (c), \
.cmask = (m), \
.weight = HWEIGHT64((u64)(n)), \
.weight = (w), \
}
#define EVENT_CONSTRAINT(c, n, m) \
__EVENT_CONSTRAINT(c, n, m, HWEIGHT(n))
#define INTEL_EVENT_CONSTRAINT(c, n) \
EVENT_CONSTRAINT(c, n, INTEL_ARCH_EVTSEL_MASK)
@@ -2622,7 +2625,8 @@ void __init init_hw_perf_events(void)
register_die_notifier(&perf_event_nmi_notifier);
unconstrained = (struct event_constraint)
EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_events) - 1, 0);
__EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_events) - 1,
0, x86_pmu.num_events);
pr_info("... version: %d\n", x86_pmu.version);
pr_info("... bit width: %d\n", x86_pmu.event_bits);