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genirq/affinity: Replace cpumask_weight() with cpumask_empty() where appropriate

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__irq_build_affinity_masks() calls cpumask_weight() to check if any bit of
a given cpumask is set.

This can be done 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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220210224933.379149-22-yury.norov@gmail.com
This commit is contained in:
Yury Norov
2022-02-10 14:49:05 -08:00
committed by Thomas Gleixner
parent 3f893a5962
commit 911488de05
1 changed files with 1 additions and 1 deletions
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kernel/irq/affinity.c
+1 -1
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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);