perf: Introduce is_sampling_event()

and use it when appropriate.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1290525705-6265-1-git-send-email-fbuihuu@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 7c1a4c35fd4..c01dfec635d 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -442,7 +442,7 @@ static int x86_setup_perfctr(struct perf_event *event)
         struct hw_perf_event *hwc = &event->hw;
         u64 config;
 
-        if (!hwc->sample_period) {
+        if (!is_sampling_event(event)) {
                 hwc->sample_period = x86_pmu.max_period;
                 hwc->last_period = hwc->sample_period;
                 local64_set(&hwc->period_left, hwc->sample_period);