linux-kernel - [PATCH] kernel: perf_event: use for_each_set

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Message-Id: <20200708062023.7986-1-vulab@iscas.ac.cn>
Date:   Wed,  8 Jul 2020 06:20:23 +0000
From:   Xu Wang <vulab@...as.ac.cn>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, chris@...kel.net,
        jcmvbkbc@...il.com, linux-kernel@...r.kernel.org
Cc:     linux-xtensa@...ux-xtensa.org, Xu Wang <vulab@...as.ac.cn>
Subject: [PATCH] kernel: perf_event: use for_each_set_bit() to simplify the code

Using for_each_set_bit() to simplify the code.

Signed-off-by: Xu Wang <vulab@...as.ac.cn>
---
 arch/xtensa/kernel/perf_event.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/xtensa/kernel/perf_event.c b/arch/xtensa/kernel/perf_event.c
index 9bae79f70301..99fcd63ce597 100644
--- a/arch/xtensa/kernel/perf_event.c
+++ b/arch/xtensa/kernel/perf_event.c
@@ -362,9 +362,7 @@ irqreturn_t xtensa_pmu_irq_handler(int irq, void *dev_id)
 	struct xtensa_pmu_events *ev = this_cpu_ptr(&xtensa_pmu_events);
 	unsigned i;
 
-	for (i = find_first_bit(ev->used_mask, XCHAL_NUM_PERF_COUNTERS);
-	     i < XCHAL_NUM_PERF_COUNTERS;
-	     i = find_next_bit(ev->used_mask, XCHAL_NUM_PERF_COUNTERS, i + 1)) {
+	for_each_set_bit(i, ev->used_mask, XCHAL_NUM_PERF_COUNTERS) {
 		uint32_t v = get_er(XTENSA_PMU_PMSTAT(i));
 		struct perf_event *event = ev->event[i];
 		struct hw_perf_event *hwc = &event->hw;
-- 
2.17.1