In general it's preferable to avoid placing cpumasks on the stack, as
for large values of NR_CPUS these can consume significant amounts of
stack space and make stack overflows more likely.
Use cpumask_any_and_but() to avoid the need for a temporary cpumask on
the stack.
Suggested-by: Mark Rutland <mark.rutland@xxxxxxx>
Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Dawei Li <dawei.li@xxxxxxxxxxxx>
---
drivers/perf/arm_dsu_pmu.c | 19 ++++++-------------
1 file changed, 6 insertions(+), 13 deletions(-)
diff --git a/drivers/perf/arm_dsu_pmu.c b/drivers/perf/arm_dsu_pmu.c
index bae3ca37f846..adc0bbb5fafe 100644
--- a/drivers/perf/arm_dsu_pmu.c
+++ b/drivers/perf/arm_dsu_pmu.c
@@ -230,15 +230,6 @@ static const struct attribute_group *dsu_pmu_attr_groups[] = {
NULL,
};
-static int dsu_pmu_get_online_cpu_any_but(struct dsu_pmu *dsu_pmu, int cpu)
-{
- struct cpumask online_supported;
-
- cpumask_and(&online_supported,
- &dsu_pmu->associated_cpus, cpu_online_mask);
- return cpumask_any_but(&online_supported, cpu);
-}
-
static inline bool dsu_pmu_counter_valid(struct dsu_pmu *dsu_pmu, u32 idx)
{
return (idx < dsu_pmu->num_counters) ||
@@ -827,14 +818,16 @@ static int dsu_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
static int dsu_pmu_cpu_teardown(unsigned int cpu, struct hlist_node *node)
{
- int dst;
- struct dsu_pmu *dsu_pmu = hlist_entry_safe(node, struct dsu_pmu,
- cpuhp_node);
+ struct dsu_pmu *dsu_pmu;
+ unsigned int dst;
+
+ dsu_pmu = hlist_entry_safe(node, struct dsu_pmu, cpuhp_node);
if (!cpumask_test_and_clear_cpu(cpu, &dsu_pmu->active_cpu))
return 0;
- dst = dsu_pmu_get_online_cpu_any_but(dsu_pmu, cpu);
+ dst = cpumask_any_and_but(&dsu_pmu->associated_cpus,
+ cpu_online_mask, cpu);
/* If there are no active CPUs in the DSU, leave IRQ disabled */
if (dst >= nr_cpu_ids)
return 0;
--
2.27.0
