diff options
Diffstat (limited to 'arch/arm64/kernel/perf_event.c')
| -rw-r--r-- | arch/arm64/kernel/perf_event.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index baf5afb7e6a0..25a5308744b1 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -169,8 +169,14 @@ armpmu_event_set_period(struct perf_event *event, ret = 1; } - if (left > (s64)armpmu->max_period) - left = armpmu->max_period; + /* + * Limit the maximum period to prevent the counter value + * from overtaking the one we are about to program. In + * effect we are reducing max_period to account for + * interrupt latency (and we are being very conservative). + */ + if (left > (armpmu->max_period >> 1)) + left = armpmu->max_period >> 1; local64_set(&hwc->prev_count, (u64)-left); @@ -1276,7 +1282,7 @@ arch_initcall(cpu_pmu_reset); /* * PMU platform driver and devicetree bindings. */ -static struct of_device_id armpmu_of_device_ids[] = { +static const struct of_device_id armpmu_of_device_ids[] = { {.compatible = "arm,armv8-pmuv3"}, {}, }; |