linux-kernel - [PATCH 14/20] job control: Small reorganization of wait_consider

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Date:	Wed, 23 Mar 2011 11:06:00 +0100
From:	Tejun Heo <tj@...nel.org>
To:	oleg@...hat.com, jan.kratochvil@...hat.com,
	vda.linux@...glemail.com
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, indan@....nu, roland@...k.frob.com,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 14/20] job control: Small reorganization of wait_consider_task()

Move EXIT_DEAD test in wait_consider_task() above ptrace check.  As
ptraced tasks can't be EXIT_DEAD, this change doesn't cause any
behavior change.  This is to prepare for further changes.

Signed-off-by: Tejun Heo <tj@...nel.org>
Acked-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/exit.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index f9a45eb..b4a935c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1537,6 +1537,10 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
 		return 0;
 	}
 
+	/* dead body doesn't have much to contribute */
+	if (p->exit_state == EXIT_DEAD)
+		return 0;
+
 	if (likely(!ptrace) && unlikely(task_ptrace(p))) {
 		/*
 		 * This child is hidden by ptrace.
@@ -1546,9 +1550,6 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
 		return 0;
 	}
 
-	if (p->exit_state == EXIT_DEAD)
-		return 0;
-
 	/*
 	 * We don't reap group leaders with subthreads.
 	 */
-- 
1.7.1

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