linux-kernel - [PATCH] mm/mempolicy: return NULL if node is NUMA_NO_NODE in get_task

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Message-ID: <52007660.7070907@huawei.com>
Date:	Tue, 6 Aug 2013 12:06:56 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH] 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.

Signed-off-by: Jianguo Wu <wujianguo@...wei.com>
---
 mm/mempolicy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4baf12e..e0e3398 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -129,6 +129,8 @@ static struct mempolicy *get_task_policy(struct task_struct *p)
 		node = numa_node_id();
 		if (node != NUMA_NO_NODE)
 			pol = &preferred_node_policy[node];
+		else
+			return NULL;
 
 		/* preferred_node_policy is not initialised early in boot */
 		if (!pol->mode)
-- 
1.8.2.2



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