lkml.org 
[lkml]   [2022]   [Jan]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 23/54] sched: replace cpumask_weight with cpumask_empty where appropriate
Date
In some places, kernel/sched code 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>
---
kernel/sched/core.c | 2 +-
kernel/sched/topology.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 2e4ae00e52d1..918d0bdc2ea8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8707,7 +8707,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
{
int ret = 1;

- if (!cpumask_weight(cur))
+ if (cpumask_empty(cur))
return ret;

ret = dl_cpuset_cpumask_can_shrink(cur, trial);
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index d201a7052a29..8478e2a8cd65 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -74,7 +74,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
break;
}

- if (!cpumask_weight(sched_group_span(group))) {
+ if (cpumask_empty(sched_group_span(group))) {
printk(KERN_CONT "\n");
printk(KERN_ERR "ERROR: empty group\n");
break;
--
2.30.2
\
 
 \ /
  Last update: 2022-01-23 19:42    [W:0.247 / U:0.244 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site