linux-kernel - [PATCH 3/4] pids: sys_setpgid: use change

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Message-ID: <20080320152818.GA6338@tv-sign.ru>
Date:	Thu, 20 Mar 2008 18:28:18 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] pids: sys_setpgid: use change_pid() helper

Use change_pid() instead of detach_pid() + attach_pid() in sys_setpgid().

This way task_pgrp() is not NULL in between.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 25/kernel/sys.c~3_SETPGRP	2008-02-18 19:15:40.000000000 +0300
+++ 25/kernel/sys.c	2008-03-20 18:21:17.000000000 +0300
@@ -972,8 +972,7 @@ asmlinkage long sys_setpgid(pid_t pid, p
 		goto out;
 
 	if (task_pgrp(p) != pgrp) {
-		detach_pid(p, PIDTYPE_PGID);
-		attach_pid(p, PIDTYPE_PGID, pgrp);
+		change_pid(p, PIDTYPE_PGID, pgrp);
 		set_task_pgrp(p, pid_nr(pgrp));
 	}
 

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