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memory hotplug: reset pgdat->kswapd to NULL if creating kernel thread fails 

If kthread_run() fails, pgdat->kswapd contains errno.  When we stop this
thread, we only check whether pgdat->kswapd is NULL and access it.  If
it contains errno, it will cause page fault.  Reset pgdat->kswapd to
NULL when creating kernel thread fails can avoid this problem.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wen Congyang 2012-09-17 14:08:55 -07:00 committed by Linus Torvalds
parent 6bf6104573
commit 18b48d5873
1 changed files with 1 additions and 0 deletions
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mm/vmscan.c
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@ -3102,6 +3102,7 @@ int kswapd_run(int nid)
/* failure at boot is fatal */
BUG_ON(system_state == SYSTEM_BOOTING);
printk("Failed to start kswapd on node %d\n",nid);
pgdat->kswapd = NULL;
ret = -1;
}
return ret;