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genirq/affinity: replace cpumask_weight with cpumask_empty where appropriate 

__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>
This commit is contained in:
Yury Norov 2022-01-23 10:38:51 -08:00
parent d72002ae67
commit 99248e351a
1 changed files with 1 additions and 1 deletions
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2
kernel/irq/affinity.c
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@ -258,7 +258,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
nodemask_t nodemsk = NODE_MASK_NONE; nodemask_t nodemsk = NODE_MASK_NONE;
struct node_vectors *node_vectors; struct node_vectors *node_vectors;
if (!cpumask_weight(cpu_mask)) if (cpumask_empty(cpu_mask))
return 0; return 0;
nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk); nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk);