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Subject[PATCH 17/54] gpu: drm: replace cpumask_weight with cpumask_empty where appropriate
Date
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>
---
drivers/gpu/drm/i915/i915_pmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index ea655161793e..1894c876b31d 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -1048,7 +1048,7 @@ 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;
--
2.30.2
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