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authorMichael Ellerman <michael@ellerman.id.au>2013-06-28 18:15:14 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-25 14:07:22 -0700
commit382b9efb7be2d07e51f0a491ecd0a985e1ceb86e (patch)
tree4a0d92b1d9b9af345bcbb159d9bccd6316344ee2 /arch/powerpc
parentb26eb91187fdfa37b304b30003f799899e6373c9 (diff)
downloadlinaro-lsk-382b9efb7be2d07e51f0a491ecd0a985e1ceb86e.tar.gz
powerpc/perf: Don't enable if we have zero events
commit 4ea355b5368bde0574c12430df53334c4be3bdcf upstream. In power_pmu_enable() we still enable the PMU even if we have zero events. This should have no effect but doesn't make much sense. Instead just return after telling the hypervisor that we are not using the PMCs. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/perf/core-book3s.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c
index af4b4b1a691..d3ee2e50a3a 100644
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -926,6 +926,11 @@ static void power_pmu_enable(struct pmu *pmu)
if (!cpuhw->disabled)
goto out;
+ if (cpuhw->n_events == 0) {
+ ppc_set_pmu_inuse(0);
+ goto out;
+ }
+
cpuhw->disabled = 0;
/*
@@ -937,8 +942,6 @@ static void power_pmu_enable(struct pmu *pmu)
if (!cpuhw->n_added) {
mtspr(SPRN_MMCRA, cpuhw->mmcr[2] & ~MMCRA_SAMPLE_ENABLE);
mtspr(SPRN_MMCR1, cpuhw->mmcr[1]);
- if (cpuhw->n_events == 0)
- ppc_set_pmu_inuse(0);
goto out_enable;
}