[PATCH] sched/deadline: simplify dl_bw_cpus() using cpumask_weight_and()

From: Miaohe Lin <linmiaohe@huawei.com>
To: <mingo@redhat.com>, <peterz@infradead.org>,
	<juri.lelli@redhat.com>, <vincent.guittot@linaro.org>
Cc: <dietmar.eggemann@arm.com>, <rostedt@goodmis.org>,
	<bsegall@google.com>, <mgorman@suse.de>, <bristot@redhat.com>,
	<vschneid@redhat.com>, <linux-kernel@vger.kernel.org>,
	<linmiaohe@huawei.com>
Subject: [PATCH] sched/deadline: simplify dl_bw_cpus() using cpumask_weight_and()
Date: Mon, 22 May 2023 19:56:05 +0800	[thread overview]
Message-ID: <20230522115605.1238227-1-linmiaohe@huawei.com> (raw)

cpumask_weight_and() can be used to count of bits both in rd->span and
cpu_active_mask. No functional change intended.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
 kernel/sched/deadline.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 166c3e6eae61..fe983ed7bb12 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -110,20 +110,11 @@ 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)
-- 
2.27.0

