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cpumask: introduce cpumask_nth_and_andnot

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Introduce cpumask_nth_and_andnot() based on find_nth_and_andnot_bit().
It's used in the following patch to traverse cpumasks without storing
intermediate result in temporary cpumask.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Peter Lafreniere <peter@n8pjl.ca>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yury Norov 2023-01-20 20:24:29 -08:00 committed by Jakub Kicinski
parent 4324511780
commit 62f4386e56
1 changed files with 20 additions and 0 deletions
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20
include/linux/cpumask.h
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@ -391,6 +391,26 @@ unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1,
nr_cpumask_bits, cpumask_check(cpu));
}
/**
* cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd.
* @srcp1: the cpumask pointer
* @srcp2: the cpumask pointer
* @srcp3: the cpumask pointer
* @cpu: the N'th cpu to find, starting from 0
*
* Returns >= nr_cpu_ids if such cpu doesn't exist.
*/
static __always_inline
unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1,
const struct cpumask *srcp2,
const struct cpumask *srcp3)
{
return find_nth_and_andnot_bit(cpumask_bits(srcp1),
cpumask_bits(srcp2),
cpumask_bits(srcp3),
nr_cpumask_bits, cpumask_check(cpu));
}
#define CPU_BITS_NONE \
{ \
[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \