linux-kernel - [PATCH 1/6] pid: Remove the child_reaper special case in init/main.c

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Message-ID: <m1ljaaqejm.fsf_-_@fess.ebiederm.org>
Date:	Sun, 20 Jun 2010 01:44:13 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Louis Rilling <louis.rilling@...labs.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Linux Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org, Daniel Lezcano <dlezcano@...ibm.com>
Subject: [PATCH 1/6] pid:  Remove the child_reaper special case in init/main.c


It turns out that the existing assignment in copy_process of
the child_reaper can handle the initial assignment of child_reaper
we just need to generalize the test in kernel/fork.c

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 init/main.c   |    9 ---------
 kernel/fork.c |    2 +-
 2 files changed, 1 insertions(+), 10 deletions(-)

diff --git a/init/main.c b/init/main.c
index 3bdb152..38f7edc 100644
--- a/init/main.c
+++ b/init/main.c
@@ -865,15 +865,6 @@ static int __init kernel_init(void * unused)
 	 * init can run on any cpu.
 	 */
 	set_cpus_allowed_ptr(current, cpu_all_mask);
-	/*
-	 * Tell the world that we're going to be the grim
-	 * reaper of innocent orphaned children.
-	 *
-	 * We don't want people to have to make incorrect
-	 * assumptions about where in the task array this
-	 * can be found.
-	 */
-	init_pid_ns.child_reaper = current;
 
 	cad_pid = task_pid(current);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index b6cce14..8b85b17 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1263,7 +1263,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 		tracehook_finish_clone(p, clone_flags, trace);
 
 		if (thread_group_leader(p)) {
-			if (clone_flags & CLONE_NEWPID)
+			if (pid->numbers[pid->level].nr == 1)
 				p->nsproxy->pid_ns->child_reaper = p;
 
 			p->signal->leader_pid = pid;
-- 
1.6.5.2.143.g8cc62

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