From: Will Deacon <will.deacon@arm.com>
Date: Thu, 2 Sep 2010 08:32:08 +0000 (+0100)
Subject: ARM: 6352/1: perf: fix event validation
X-Git-Tag: upstream/snapshot3+hdmi~13071^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=65b4711ff513767341aa1915c822de6ec0de65cb;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

ARM: 6352/1: perf: fix event validation

The validate_event function in the ARM perf events backend has the
following problems:

1.) Events that are disabled count towards the cost.
2.) Events associated with other PMUs [for example, software events or
    breakpoints] do not count towards the cost, but do fail validation,
    causing the group to fail.

This patch changes validate_event so that it ignores events in the
PERF_EVENT_STATE_OFF state or that are scheduled for other PMUs.

Reported-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Jamie Iles <jamie.iles@picochip.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index e213925..ecbb028 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -319,8 +319,8 @@ validate_event(struct cpu_hw_events *cpuc,
 {
 	struct hw_perf_event fake_event = event->hw;
 
-	if (event->pmu && event->pmu != &pmu)
-		return 0;
+	if (event->pmu != &pmu || event->state <= PERF_EVENT_STATE_OFF)
+		return 1;
 
 	return armpmu->get_event_idx(cpuc, &fake_event) >= 0;
 }