Commit 4fcbe96e authored by Dan Williams's avatar Dan Williams
Browse files

mm/numa: Skip NUMA_NO_NODE and online nodes in numa_map_to_online_node() 



Update numa_map_to_online_node() to stop falling back to numa node 0
when the input is NUMA_NO_NODE. Also, skip the lookup if @node is
online. This makes the routine compatible with other arch node mapping
routines.

Reported-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Link: https://lore.kernel.org/r/157401275716.43284.13185549705765009174.stgit@dwillia2-desk3.amr.corp.intel.com


Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/158188325316.894464.15650888748083329531.stgit@dwillia2-desk3.amr.corp.intel.com
parent b2ca916c

mm/mempolicy.c

+8 −12
Original line number Diff line number Diff line
@@ -135,15 +135,12 @@ static struct mempolicy preferred_node_policy[MAX_NUMNODES]; 
 */

int numa_map_to_online_node(int node)

{

	int min_node;

	int min_dist = INT_MAX, dist, n, min_node;



	if (node == NUMA_NO_NODE)

		node = 0;

	if (node == NUMA_NO_NODE || node_online(node))

		return node;



	min_node = node;

	if (!node_online(node)) {

		int min_dist = INT_MAX, dist, n;



	for_each_online_node(n) {

		dist = node_distance(node, n);

		if (dist < min_dist) {
@@ -151,7 +148,6 @@ int numa_map_to_online_node(int node) 
			min_node = n;

		}

	}

	}



	return min_node;

}

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