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sched/topology: Introduce for_each_numa_hop_mask()

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The recently introduced sched_numa_hop_mask() exposes cpumasks of CPUs
reachable within a given distance budget, wrap the logic for iterating over
all (distance, mask) values inside an iterator macro.

Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Valentin Schneider 2023-01-20 20:24:34 -08:00 committed by Jakub Kicinski
parent 9feae65845
commit 06ac01721f
1 changed files with 18 additions and 0 deletions
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18
include/linux/topology.h
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@ -261,4 +261,22 @@ sched_numa_hop_mask(unsigned int node, unsigned int hops)
}
#endif /* CONFIG_NUMA */
/**
* for_each_numa_hop_mask - iterate over cpumasks of increasing NUMA distance
* from a given node.
* @mask: the iteration variable.
* @node: the NUMA node to start the search from.
*
* Requires rcu_lock to be held.
*
* Yields cpu_online_mask for @node == NUMA_NO_NODE.
*/
#define for_each_numa_hop_mask(mask, node) \
for (unsigned int __hops = 0; \
mask = (node != NUMA_NO_NODE || __hops) ? \
sched_numa_hop_mask(node, __hops) : \
cpu_online_mask, \
!IS_ERR_OR_NULL(mask); \
__hops++)
#endif /* _LINUX_TOPOLOGY_H */