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sched/deadline: Use cpumask_weight_and() in dl_bw_cpus

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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: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juri Lelli <juri.lelli@redhat.com>
Link: https://patch.msgid.link/20251014100342.978936-3-sshegde@linux.ibm.com
This commit is contained in:
Shrikanth Hegde
2025-10-14 15:33:42 +05:30
committed by Peter Zijlstra
parent 2614069c59
commit b4bfacd392
1 changed files with 1 additions and 10 deletions
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11
kernel/sched/deadline.c
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@@ -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)