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

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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: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Aneesh 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: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lore.kernel.org/r/158188325316.894464.15650888748083329531.stgit@dwillia2-desk3.amr.corp.intel.com
This commit is contained in:
Dan Williams 2020-02-16 12:00:53 -08:00
parent b2ca916ce3
commit 4fcbe96e4d
1 changed files with 8 additions and 12 deletions
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20
mm/mempolicy.c
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@ -135,21 +135,17 @@ 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) {
min_dist = dist;
min_node = n;
}
for_each_online_node(n) {
dist = node_distance(node, n);
if (dist < min_dist) {
min_dist = dist;
min_node = n;
}
}