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drm/i915/pmu: replace cpumask_weight with cpumask_empty where appropriate 

i915_pmu_cpu_online() calls cpumask_weight() to check if any bit of a
given cpumask is set. We can do it more efficiently with cpumask_empty()
because cpumask_empty() stops traversing the cpumask as soon as it finds
first set bit, while cpumask_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Yury Norov 2022-01-23 10:38:48 -08:00
parent 4aec74bccf
commit a37e94fe7c
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_pmu.c
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@ -1050,7 +1050,7 @@ static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
GEM_BUG_ON(!pmu->base.event_init);
/* Select the first online CPU as a designated reader. */
if (!cpumask_weight(&i915_pmu_cpumask))
if (cpumask_empty(&i915_pmu_cpumask))
cpumask_set_cpu(cpu, &i915_pmu_cpumask);
return 0;