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authorRobin Murphy <robin.murphy@arm.com>2018-05-14 16:34:52 +0300
committerWill Deacon <will.deacon@arm.com>2018-05-21 20:12:53 +0300
commit28c01dc9d85e4cd744f254c45d3c894bca168ed6 (patch)
treea91e9031e6abce0166d3a2d43cdaf9855312b160 /drivers/perf
parent75dc344145190bf53aed7a28dbc27c11180d94e5 (diff)
downloadlinux-28c01dc9d85e4cd744f254c45d3c894bca168ed6.tar.xz
perf/arm-cci: Remove pointless PMU disabling
The CCI PMU driver bears some legacy remnants of the arm_pmu framework from when it was split in c6f85cb4305b ("bus: cci: move away from arm_pmu framework"). In particular this perf_pmu_{dis,en}able() dance around pmu->add which was fixed for arm_pmu in a9e469d1c89b ("drivers/perf: arm_pmu: remove pointless PMU disabling"). For the exact same reasons (i.e. perf core already does this around the call anyway), give cci_pmu_add() the exact same change, which also prevents having to export those core functions to build it as a module. 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.c13
1 files changed, 3 insertions, 10 deletions
diff --git a/drivers/perf/arm-cci.c b/drivers/perf/arm-cci.c
index 7d916dc2214d..33b47c292d79 100644
--- a/drivers/perf/arm-cci.c
+++ b/drivers/perf/arm-cci.c
@@ -1184,16 +1184,11 @@ static int cci_pmu_add(struct perf_event *event, int flags)
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
struct hw_perf_event *hwc = &event->hw;
int idx;
- int err = 0;
-
- perf_pmu_disable(event->pmu);
/* If we don't have a space for the counter then finish early. */
idx = pmu_get_event_idx(hw_events, event);
- if (idx < 0) {
- err = idx;
- goto out;
- }
+ if (idx < 0)
+ return idx;
event->hw.idx = idx;
hw_events->events[idx] = event;
@@ -1205,9 +1200,7 @@ static int cci_pmu_add(struct perf_event *event, int flags)
/* Propagate our changes to the userspace mapping. */
perf_event_update_userpage(event);
-out:
- perf_pmu_enable(event->pmu);
- return err;
+ return 0;
}
static void cci_pmu_del(struct perf_event *event, int flags)