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authorRobin Murphy <robin.murphy@arm.com>2018-05-21 12:17:09 +0100
committerWill Deacon <will.deacon@arm.com>2018-05-21 18:06:11 +0100
commit5c591304e710339a75a9f0f9f3f085aa4109e55d (patch)
treed6a2b19bd964f4f2fd6ed61e91a45cb38de0a76c /drivers/perf
parentd0f2e423295313a30b1d56f3b24e9e927f0b66b7 (diff)
downloadlinux-5c591304e710339a75a9f0f9f3f085aa4109e55d.tar.bz2
perf/arm-cci: Remove unnecessary period adjustment
Since sampling events are rejected up-front by cci_pmu_event_init(), it doesn't make much sense to go fiddling with the sampling period later. This would seem to be just another leftover artefact of the arm_pmu framwork, and as such can go. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/perf')
-rw-r--r--drivers/perf/arm-cci.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 383b2d3dcbc6..72c464485470 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1304,15 +1304,6 @@ static int __hw_perf_event_init(struct perf_event *event)
*/
hwc->config_base |= (unsigned long)mapping;
- /*
- * Limit the sample_period to half of the counter width. That way, the
- * new counter value is far less likely to overtake the previous one
- * unless you have some serious IRQ latency issues.
- */
- hwc->sample_period = CCI_PMU_CNTR_MASK >> 1;
- hwc->last_period = hwc->sample_period;
- local64_set(&hwc->period_left, hwc->sample_period);
-
if (event->group_leader != event) {
if (validate_group(event) != 0)
return -EINVAL;