linux-kernel - [RFC,PATCH 1/2] shift security_task_wait() from eligible_child() to wait_consider

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Message-ID: <20090622170434.GA4903@redhat.com>
Date:	Mon, 22 Jun 2009 19:04:34 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Ratan Nalumasu <rnalumasu@...il.com>,
	Roland McGrath <roland@...hat.com>,
	Vitaly Mayatskikh <vmayatsk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC,PATCH 1/2] shift security_task_wait() from eligible_child()
	to wait_consider_task()

Preparation, no functional changes.

eligible_child() has a single caller, wait_consider_task(). We can move
security_task_wait() out from eligible_child(), this allows us to use it
for filtered wake_up().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---

 kernel/exit.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- WAIT/kernel/exit.c~1_SPLIT_ELIGIBLE	2009-06-22 17:19:55.000000000 +0200
+++ WAIT/kernel/exit.c	2009-06-22 17:33:08.000000000 +0200
@@ -1104,8 +1104,6 @@ static struct pid *task_pid_type(struct 
 
 static int eligible_child(struct wait_opts *wo, struct task_struct *p)
 {
-	int err;
-
 	if (wo->wo_type < PIDTYPE_MAX) {
 		if (task_pid_type(p, wo->wo_type) != wo->wo_pid)
 			return 0;
@@ -1120,10 +1118,6 @@ static int eligible_child(struct wait_op
 	    && !(wo->wo_flags & __WALL))
 		return 0;
 
-	err = security_task_wait(p);
-	if (err)
-		return err;
-
 	return 1;
 }
 
@@ -1480,6 +1474,7 @@ static int wait_consider_task(struct wai
 	if (!ret)
 		return ret;
 
+	ret = security_task_wait(p);
 	if (unlikely(ret < 0)) {
 		/*
 		 * If we have not yet seen any eligible child,

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