[PATCH] clocksource: Utilize cpumask_next_wrap() to shrink code size

I Hsin Cheng
2025-06-11T10:45:13Z

Simplify the procedure of CPU random selection under
"clocksource_verify_choose_cpus()" with "cpumask_next_wrap()". The
logic is still the same but with this change it can shrink the code size
by 18 bytes and increase readability.

$ ./scripts/bloat-o-meter vmlinux_old vmlinux_new
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-18 (-18)
Function old new delta
clocksource_verify_percpu 1064 1046 -18

Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
---
kernel/time/clocksource.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index bb48498ebb5a..ab580873408b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -343,9 +343,7 @@ static void clocksource_verify_choose_cpus(void)
*/
for (i = 1; i < n; i++) {
cpu = get_random_u32_below(nr_cpu_ids);
- cpu = cpumask_next(cpu - 1, cpu_online_mask);
- if (cpu >= nr_cpu_ids)
- cpu = cpumask_first(cpu_online_mask);
+ cpu = cpumask_next_wrap(cpu - 1, cpu_online_mask);
if (!WARN_ON_ONCE(cpu >= nr_cpu_ids))
cpumask_set_cpu(cpu, &cpus_chosen);
}
--
2.43.0