clocksource: Replace cpumask_weight() with cpumask_empty()

[ Upstream commit 8afbcaf8 ]

clocksource_verify_percpu() 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/20220210224933.379149-24-yury.norov@gmail.com


Stable-dep-of: 6bb05a33 ("clocksource: Use migrate_disable() to avoid calling get_random_u32() in atomic context")
Signed-off-by: Sasha Levin <sashal@kernel.org>