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 20/54] kernel/irq: replace cpumask_weight with cpumask_empty where appropriate
Date
__irq_build_affinity_masks() 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/irq/affinity.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index f7ff8919dc9b..18740faf0eb1 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -258,7 +258,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
nodemask_t nodemsk = NODE_MASK_NONE;
struct node_vectors *node_vectors;

- if (!cpumask_weight(cpu_mask))
+ if (cpumask_empty(cpu_mask))
return 0;

nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk);
--
2.30.2
\
 
 \ /
  Last update: 2022-01-23 19:42    [W:0.706 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site