[PATCH] oom: handle oom_disable exiting

Having the oomkilladj == OOM_DISABLE check before the releasing check means
that oomkilladj == OOM_DISABLE tasks exiting will not stop the OOM killer.

Moving the test down will give the desired behaviour.  Also: it will allow
them to "OOM-kill" themselves if they are exiting.  As per the previous patch,
this is required to prevent OOM killer deadlocks (and they don't actually get
killed, because they're already exiting -- they're simply allowed access to
memory reserves).
Signed-off-by: NNick Piggin <npiggin@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

mm/oom_kill.c

@@ -204,8 +204,6 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
 		/* skip the init task with pid == 1 */
 		if (p->pid == 1)
 			continue;
-		if (p->oomkilladj == OOM_DISABLE)
-			continue;
 
 		/*
 		 * This is in the process of releasing memory so wait for it
@@ -230,6 +228,8 @@ static struct task_struct *select_bad_process(unsigned long *ppoints)
 			}
 			return ERR_PTR(-1UL);
 		}
+		if (p->oomkilladj == OOM_DISABLE)
+			continue;
 		if (p->flags & PF_SWAPOFF)
 			return p;