Re: [PATCH 17/54] gpu: drm: replace cpumask_weight with cpumask_empty where appropriate

[Tvrtko Ursulin]

On 23/01/2022 18:38, Yury Norov wrote:
> 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@xxxxxxxxx>
> ---
>   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;

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

I see it's a large series which only partially appeared on our mailing 
lists. So for instance it hasn't got tested by our automated CI. (Not 
that I expect any problems in this patch.)

What are the plans in terms of which tree will it get merged through?

Regards,

Tvrtko