From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 22 Jun 2011 21:10:11 +0000 (+0200)
Subject: do not change dead_task->exit_signal
X-Git-Tag: firefly_0821_release~3680^2~5000^2~12
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d4f7c511c1c2a67eb287987cf1ce9554149030e6;p=firefly-linux-kernel-4.4.55.git

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@redhat.com>
Reviewed-by: Tejun Heo <tj@kernel.org>
---

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 66a28bd71ef6..d7ccc79454f5 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -384,7 +384,6 @@ static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
 			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;
 		}
 	}
diff --git a/kernel/signal.c b/kernel/signal.c
index d52e82cd62bb..4c4ad34caf77 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1650,7 +1650,6 @@ bool do_notify_parent(struct task_struct *tsk, int sig)
 		 * it, just use SIG_IGN instead).
 		 */
 		autoreap = true;
-		tsk->exit_signal = -1;
 		if (psig->action[SIGCHLD-1].sa.sa_handler == SIG_IGN)
 			sig = 0;
 	}