diff mbox series

[34/54] perf: replace bitmap_weight with bitmap_weight_eq for ThunderX2

Message ID 20220123183925.1052919-35-yury.norov@gmail.com (mailing list archive)
State New, archived
Headers show
Series None | expand

Commit Message

Yury Norov Jan. 23, 2022, 6:39 p.m. UTC 
tx2_uncore_event_start() calls bitmap_weight() to compare the weight
of bitmap with a given number. We can do it more efficiently with
bitmap_weight_eq because conditional bitmap_weight may stop traversing
the bitmap earlier, as soon as condition is met.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 drivers/perf/thunderx2_pmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/perf/thunderx2_pmu.c b/drivers/perf/thunderx2_pmu.c
index 05378c0fd8f3..ebfa66b212c7 100644
--- a/drivers/perf/thunderx2_pmu.c
+++ b/drivers/perf/thunderx2_pmu.c
@@ -623,8 +623,8 @@  static void tx2_uncore_event_start(struct perf_event *event, int flags)
 		return;
 
 	/* Start timer for first event */
-	if (bitmap_weight(tx2_pmu->active_counters,
-				tx2_pmu->max_counters) == 1) {
+	if (bitmap_weight_eq(tx2_pmu->active_counters,
+				tx2_pmu->max_counters, 1)) {
 		hrtimer_start(&tx2_pmu->hrtimer,
 			ns_to_ktime(tx2_pmu->hrtimer_interval),
 			HRTIMER_MODE_REL_PINNED);