From 2800d8d19e51414403df8144eaa214bb03400b87 Mon Sep 17 00:00:00 2001
From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 30 Apr 2008 00:53:12 -0700
Subject: [PATCH] document de_thread() with exit_notify() connection
Add a couple of small comments, it is not easy to see what this code does.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/exec.c | 2 +-
kernel/exit.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/exec.c b/fs/exec.c
index 8fccc276d40d..9f9f931ef949 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -798,7 +798,7 @@ static int de_thread(struct task_struct *tsk)
if (!thread_group_leader(tsk)) {
leader = tsk->group_leader;
- sig->notify_count = -1;
+ sig->notify_count = -1; /* for exit_notify() */
for (;;) {
write_lock_irq(&tasklist_lock);
if (likely(leader->exit_state))
diff --git a/kernel/exit.c b/kernel/exit.c
index 413c81ec858e..879ed6e1c883 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -877,6 +877,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
state = EXIT_DEAD;
tsk->exit_state = state;
+ /* mt-exec, de_thread() is waiting for us */
if (thread_group_leader(tsk) &&
tsk->signal->notify_count < 0 &&
tsk->signal->group_exit_task)
--
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