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: Yury Norov <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: YuryNorov

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);