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cpumask: add cpumask_clear_cpus()

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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>
This commit is contained in:
Yury Norov [NVIDIA] 2025-06-04 15:39:37 -04:00 committed by Leon Romanovsky
parent 43163f4c30
commit 16e2707cf1
1 changed files with 12 additions and 0 deletions
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12
include/linux/cpumask.h
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@ -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