diff options
| author | Yury Norov [NVIDIA] <yury.norov@gmail.com> | 2025-06-04 15:39:37 -0400 |
|---|---|---|
| committer | Leon Romanovsky <leon@kernel.org> | 2025-06-26 05:19:15 -0400 |
| commit | 16e2707cf15e09234445d40ddd76f11240be8767 (patch) | |
| tree | fa518e34268b62d59125ddaa2d304ac76bccd7ba | |
| parent | 43163f4c30f94d2103c948a247cdf2cda5068ca7 (diff) | |
cpumask: add cpumask_clear_cpus()
When user wants to clear a range in cpumask, the only option the API
provides now is a for-loop, like:
for_each_cpu_from(cpu, mask) {
if (cpu >= ncpus)
break;
__cpumask_clear_cpu(cpu, mask);
}
In the bitmap API we have bitmap_clear() for that, which is
significantly faster than a for-loop. Propagate it to cpumasks.
Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Link: https://patch.msgid.link/20250604193947.11834-2-yury.norov@gmail.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
| -rw-r--r-- | include/linux/cpumask.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index 7ae80a7ca81e..ede95bbe8b80 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -609,6 +609,18 @@ void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) __set_bit(cpumask_check(cpu), cpumask_bits(dstp)); } +/** + * cpumask_clear_cpus - clear cpus in a cpumask + * @dstp: the cpumask pointer + * @cpu: cpu number (< nr_cpu_ids) + * @ncpus: number of cpus to clear (< nr_cpu_ids) + */ +static __always_inline void cpumask_clear_cpus(struct cpumask *dstp, + unsigned int cpu, unsigned int ncpus) +{ + cpumask_check(cpu + ncpus - 1); + bitmap_clear(cpumask_bits(dstp), cpumask_check(cpu), ncpus); +} /** * cpumask_clear_cpu - clear a cpu in a cpumask |