diff options
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index e0e178073cb5..b0bc68da6a11 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -879,8 +879,8 @@ static int hw_perf_event_reset(struct perf_event *event) u64 prev, new; int err; + prev = local64_read(&event->hw.prev_count); do { - prev = local64_read(&event->hw.prev_count); err = ecctr(event->hw.config, &new); if (err) { if (err != 3) @@ -892,7 +892,7 @@ static int hw_perf_event_reset(struct perf_event *event) */ new = 0; } - } while (local64_cmpxchg(&event->hw.prev_count, prev, new) != prev); + } while (!local64_try_cmpxchg(&event->hw.prev_count, &prev, new)); return err; } @@ -902,12 +902,12 @@ static void hw_perf_event_update(struct perf_event *event) u64 prev, new, delta; int err; + prev = local64_read(&event->hw.prev_count); do { - prev = local64_read(&event->hw.prev_count); err = ecctr(event->hw.config, &new); if (err) return; - } while (local64_cmpxchg(&event->hw.prev_count, prev, new) != prev); + } while (!local64_try_cmpxchg(&event->hw.prev_count, &prev, new)); delta = (prev <= new) ? new - prev : (-1ULL - prev) + new + 1; /* overflow */ |