linux-kernel - [PATCH 7/8] do not change dead_task->exit

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Message-ID: <20110622211011.GH20549@redhat.com>
Date:	Wed, 22 Jun 2011 23:10:11 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hch@...radead.org
Subject: [PATCH 7/8] do not change dead_task->exit_signal

__ptrace_detach() and do_notify_parent() set task->exit_signal = -1
to mark the task dead. This is no longer needed, nobody checks
exit_signal to detect the EXIT_DEAD task.

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

 kernel/ptrace.c |    1 -
 kernel/signal.c |    1 -
 2 files changed, 2 deletions(-)

--- ptrace/kernel/ptrace.c~7_dont_change_exit_signal	2011-06-22 22:47:11.000000000 +0200
+++ ptrace/kernel/ptrace.c	2011-06-22 22:47:14.000000000 +0200
@@ -384,7 +384,6 @@ static bool __ptrace_detach(struct task_
 			dead = do_notify_parent(p, p->exit_signal);
 		else if (ignoring_children(tracer->sighand)) {
 			__wake_up_parent(p, tracer);
-			p->exit_signal = -1;
 			dead = true;
 		}
 	}
--- ptrace/kernel/signal.c~7_dont_change_exit_signal	2011-06-22 22:47:11.000000000 +0200
+++ ptrace/kernel/signal.c	2011-06-22 22:47:14.000000000 +0200
@@ -1650,7 +1650,6 @@ bool do_notify_parent(struct task_struct
 		 * it, just use SIG_IGN instead).
 		 */
 		autoreap = true;
-		tsk->exit_signal = -1;
 		if (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN)
 			sig = 0;
 	}

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