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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 <[email protected]>
Acked-by: Tariq Toukan <[email protected]>
Reviewed-by: Jacob Keller <[email protected]>
Reviewed-by: Peter Lafreniere <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Yury Norov authored and Jakub Kicinski committed 2023-02-07 18:20:00 -08:00
1 parent 4324511780
commit 62f4386e56
1 file changed
+20
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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 \