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mm/mempolicy: return NULL if node is NUMA_NO_NODE in get_task_policy 

If node == NUMA_NO_NODE, pol is NULL, we should return NULL instead of
do "if (!pol->mode)" check.

[akpm@linux-foundation.org: reorganise code]
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Jianguo Wu 2013-09-11 14:21:25 -07:00 committed by Linus Torvalds
parent af0ed73e69
commit 1da6f0e1b3
1 changed files with 10 additions and 7 deletions
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17
mm/mempolicy.c
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@ -123,16 +123,19 @@ static struct mempolicy preferred_node_policy[MAX_NUMNODES];
static struct mempolicy *get_task_policy(struct task_struct *p)
{
struct mempolicy *pol = p->mempolicy;
int node;
if (!pol) {
node = numa_node_id();
if (node != NUMA_NO_NODE)
pol = &preferred_node_policy[node];
int node = numa_node_id();
/* preferred_node_policy is not initialised early in boot */
if (!pol->mode)
pol = NULL;
if (node != NUMA_NO_NODE) {
pol = &preferred_node_policy[node];
/*
* preferred_node_policy is not initialised early in
* boot
*/
if (!pol->mode)
pol = NULL;
}
}
return pol;