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perf: replace bitmap_weight with bitmap_empty where appropriate

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In some places, drivers/perf code calls bitmap_weight() to check if any
bit of a given bitmap is set. It's better to use bitmap_empty() in that
case because bitmap_empty() stops traversing the bitmap as soon as it
finds first set bit, while bitmap_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20220210224933.379149-13-yury.norov@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Yury Norov 2022-02-10 14:48:56 -08:00 committed by Will Deacon
parent 602c873eb5
commit 95ed57c73b
4 changed files with 5 additions and 5 deletions
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2
drivers/perf/arm-cci.c
View File

@ -1096,7 +1096,7 @@ static void cci_pmu_enable(struct pmu *pmu)
{
struct cci_pmu *cci_pmu = to_cci_pmu(pmu);
struct cci_pmu_hw_events *hw_events = &cci_pmu->hw_events;
int enabled = bitmap_weight(hw_events->used_mask, cci_pmu->num_cntrs);
bool enabled = !bitmap_empty(hw_events->used_mask, cci_pmu->num_cntrs);
unsigned long flags;
if (!enabled)

4
drivers/perf/arm_pmu.c
View File

@ -524,7 +524,7 @@ static void armpmu_enable(struct pmu *pmu)
{
struct arm_pmu *armpmu = to_arm_pmu(pmu);
struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
bool enabled = !bitmap_empty(hw_events->used_mask, armpmu->num_events);
/* For task-bound events we may be called on other CPUs */
if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
@ -785,7 +785,7 @@ static int cpu_pm_pmu_notify(struct notifier_block *b, unsigned long cmd,
{
struct arm_pmu *armpmu = container_of(b, struct arm_pmu, cpu_pm_nb);
struct pmu_hw_events *hw_events = this_cpu_ptr(armpmu->hw_events);
int enabled = bitmap_weight(hw_events->used_mask, armpmu->num_events);
bool enabled = !bitmap_empty(hw_events->used_mask, armpmu->num_events);
if (!cpumask_test_cpu(smp_processor_id(), &armpmu->supported_cpus))
return NOTIFY_DONE;

2
drivers/perf/hisilicon/hisi_uncore_pmu.c
View File

@ -393,7 +393,7 @@ EXPORT_SYMBOL_GPL(hisi_uncore_pmu_read);
void hisi_uncore_pmu_enable(struct pmu *pmu)
{
struct hisi_pmu *hisi_pmu = to_hisi_pmu(pmu);
int enabled = bitmap_weight(hisi_pmu->pmu_events.used_mask,
bool enabled = !bitmap_empty(hisi_pmu->pmu_events.used_mask,
hisi_pmu->num_counters);
if (!enabled)

2
drivers/perf/xgene_pmu.c
View File

@ -867,7 +867,7 @@ static void xgene_perf_pmu_enable(struct pmu *pmu)
{
struct xgene_pmu_dev *pmu_dev = to_pmu_dev(pmu);
struct xgene_pmu *xgene_pmu = pmu_dev->parent;
int enabled = bitmap_weight(pmu_dev->cntr_assign_mask,
bool enabled = !bitmap_empty(pmu_dev->cntr_assign_mask,
pmu_dev->max_counters);
if (!enabled)