Commit b4bfacd3 authored by Shrikanth Hegde's avatar Shrikanth Hegde Committed by Peter Zijlstra
Browse files

sched/deadline: Use cpumask_weight_and() in dl_bw_cpus 



cpumask_subset(a,b) -> cpumask_weight(a) should be same as cpumask_weight_and(a,b)
for_each_cpu_and(a,b) to count cpus could be replaced by cpumask_weight_and(a,b)

No Functional Change. It could save a few cycles since cpumask_weight_and
would be more efficient. Plus one less stack variable.

Signed-off-by: default avatarShrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarJuri Lelli <juri.lelli@redhat.com>
Link: https://patch.msgid.link/20251014100342.978936-3-sshegde@linux.ibm.com
parent 2614069c

kernel/sched/deadline.c

+1 −10
Original line number Diff line number Diff line
@@ -125,20 +125,11 @@ static inline struct dl_bw *dl_bw_of(int i) 
static inline int dl_bw_cpus(int i)

{

	struct root_domain *rd = cpu_rq(i)->rd;

	int cpus;



	RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),

			 "sched RCU must be held");



	if (cpumask_subset(rd->span, cpu_active_mask))

		return cpumask_weight(rd->span);



	cpus = 0;



	for_each_cpu_and(i, rd->span, cpu_active_mask)

		cpus++;



	return cpus;

	return cpumask_weight_and(rd->span, cpu_active_mask);

}



static inline unsigned long __dl_bw_capacity(const struct cpumask *mask)