Commit 62f4386e authored by Yury Norov's avatar Yury Norov Committed by Jakub Kicinski
Browse files

cpumask: introduce cpumask_nth_and_andnot 



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: default avatarYury Norov <yury.norov@gmail.com>
Acked-by: default avatarTariq Toukan <tariqt@nvidia.com>
Reviewed-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Reviewed-by: default avatarPeter Lafreniere <peter@n8pjl.ca>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 43245117

include/linux/cpumask.h

+20 −0
Original line number Diff line number Diff line
@@ -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			\