Commit 99248e35 authored Jan 23, 2022 by Yury Norov

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>

parent d72002ae

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);