From: Will Deacon Date: Fri, 12 Apr 2013 18:04:19 +0000 (+0100) Subject: ARM: 7698/1: perf: fix group validation when using enable_on_exec X-Git-Tag: v3.9-rc8~5^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cb2d8b342aa084d1f3ac29966245dec9163677fb;p=platform%2Fkernel%2Flinux-3.10.git ARM: 7698/1: perf: fix group validation when using enable_on_exec Events may be created with attr->disabled == 1 and attr->enable_on_exec == 1, which confuses the group validation code because events with the PERF_EVENT_STATE_OFF are not considered candidates for scheduling, which may lead to failure at group scheduling time. This patch fixes the validation check for ARM, so that events in the OFF state are still considered when enable_on_exec is true. Cc: stable@vger.kernel.org Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Reported-by: Sudeep KarkadaNagesha Signed-off-by: Will Deacon Signed-off-by: Russell King --- diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c index 146157d..8c3094d 100644 --- a/arch/arm/kernel/perf_event.c +++ b/arch/arm/kernel/perf_event.c @@ -253,7 +253,10 @@ validate_event(struct pmu_hw_events *hw_events, struct arm_pmu *armpmu = to_arm_pmu(event->pmu); struct pmu *leader_pmu = event->group_leader->pmu; - if (event->pmu != leader_pmu || event->state <= PERF_EVENT_STATE_OFF) + if (event->pmu != leader_pmu || event->state < PERF_EVENT_STATE_OFF) + return 1; + + if (event->state == PERF_EVENT_STATE_OFF && !event->attr.enable_on_exec) return 1; return armpmu->get_event_idx(hw_events, event) >= 0;