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perf/arm-cmn: Avoid placing cpumask on the stack

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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@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Link: https://lore.kernel.org/r/20240403155950.2068109-4-dawei.li@shingroup.cn
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Dawei Li 2024-04-03 23:59:43 +08:00 committed by Will Deacon
parent 2f6589df12
commit 60c73240f3
1 changed files with 5 additions and 5 deletions
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10
drivers/perf/arm-cmn.c
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@ -1950,20 +1950,20 @@ static int arm_cmn_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_no
struct arm_cmn *cmn;
unsigned int target;
int node;
cpumask_t mask;
cmn = hlist_entry_safe(cpuhp_node, struct arm_cmn, cpuhp_node);
if (cpu != cmn->cpu)
return 0;
node = dev_to_node(cmn->dev);
if (cpumask_and(&mask, cpumask_of_node(node), cpu_online_mask) &&
cpumask_andnot(&mask, &mask, cpumask_of(cpu)))
target = cpumask_any(&mask);
else
target = cpumask_any_and_but(cpumask_of_node(node), cpu_online_mask, cpu);
if (target >= nr_cpu_ids)
target = cpumask_any_but(cpu_online_mask, cpu);
if (target < nr_cpu_ids)
arm_cmn_migrate(cmn, target);
return 0;
}