linux-kernel - [PATCH 1/3] reduce reparent_to

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Date:	Tue, 10 Apr 2007 22:50:27 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robin Holt <holt@....com>, Roland McGrath <roland@...hat.com>,
	"Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] reduce reparent_to_init()

Move some random stuff which doesn't need tasklist_lock from reparent_to_init()
to its caller, daemonize(). Strictly speaking, rlim is protected by task_lock()
but we don't need it to copy init_task->rlim.

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

--- 2.6.21-rc5/kernel/exit.c~1_REDUCE	2007-04-05 12:18:28.000000000 +0400
+++ 2.6.21-rc5/kernel/exit.c	2007-04-10 21:32:44.000000000 +0400
@@ -271,7 +271,6 @@ static void reparent_to_init(void)
 	write_lock_irq(&tasklist_lock);
 
 	ptrace_unlink(current);
-	/* Reparent to init */
 	remove_parent(current);
 	current->parent = child_reaper(current);
 	current->real_parent = child_reaper(current);
@@ -280,17 +279,8 @@ static void reparent_to_init(void)
 	/* Set the exit signal to SIGCHLD so we signal init on exit */
 	current->exit_signal = SIGCHLD;
 
-	if (!has_rt_policy(current) && (task_nice(current) < 0))
-		set_user_nice(current, 0);
-	/* cpus_allowed? */
-	/* rt_priority? */
-	/* signals? */
 	security_task_reparent_to_init(current);
-	memcpy(current->signal->rlim, init_task.signal->rlim,
-	       sizeof(current->signal->rlim));
-	atomic_inc(&(INIT_USER->__count));
 	write_unlock_irq(&tasklist_lock);
-	switch_uid(INIT_USER);
 }
 
 void __set_special_pids(pid_t session, pid_t pgrp)
@@ -402,6 +392,17 @@ void daemonize(const char *name, ...)
 	atomic_inc(&current->files->count);
 
 	reparent_to_init();
+
+	if (!has_rt_policy(current) && (task_nice(current) < 0))
+		set_user_nice(current, 0);
+	/* cpus_allowed? */
+	/* rt_priority? */
+	/* signals? */
+	memcpy(current->signal->rlim, init_task.signal->rlim,
+	       sizeof(current->signal->rlim));
+
+	atomic_inc(&(INIT_USER->__count));
+	switch_uid(INIT_USER);
 }
 
 EXPORT_SYMBOL(daemonize);

-
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