From 0d7d9b3a456aa8670cd9552f69529d57716f3122 Mon Sep 17 00:00:00 2001 From: Alexandru-Cezar Sardan Date: Thu, 26 Jun 2014 11:58:58 +0300 Subject: [PATCH] perf/powerpc: reset event hw state when adding it to the PMU When adding an event to the PMU with PERF_EF_START the STOPPED and UPTODATE flags need to be cleared in the hw.event status variable because they are preventing the update of the event count on overflow interrupt. Signed-off-by: Alexandru-Cezar Sardan Signed-off-by: Scott Wood --- arch/powerpc/perf/core-fsl-emb.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/perf/core-fsl-emb.c b/arch/powerpc/perf/core-fsl-emb.c index e9fe904b6538..5d747b4cb8ee 100644 --- a/arch/powerpc/perf/core-fsl-emb.c +++ b/arch/powerpc/perf/core-fsl-emb.c @@ -330,9 +330,11 @@ static int fsl_emb_pmu_add(struct perf_event *event, int flags) } local64_set(&event->hw.prev_count, val); - if (!(flags & PERF_EF_START)) { + if (unlikely(!(flags & PERF_EF_START))) { event->hw.state = PERF_HES_STOPPED | PERF_HES_UPTODATE; val = 0; + } else { + event->hw.state &= ~(PERF_HES_STOPPED | PERF_HES_UPTODATE); } write_pmc(i, val); -- 2.20.1