Commit 911488de authored by Yury Norov's avatar Yury Norov Committed by Thomas Gleixner
Browse files

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.

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: default avatarYury Norov <yury.norov@gmail.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220210224933.379149-22-yury.norov@gmail.com
parent 3f893a59

kernel/irq/affinity.c

+1 −1
Original line number Diff line number Diff line
@@ -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);