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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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