From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 29 Mar 2006 00:11:27 +0000 (-0800)
Subject: [PATCH] cleanup __exit_signal->cleanup_sighand path
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a7e5328a06a2beee3a2bbfaf87ce2a7bbe937de1;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

[PATCH] cleanup __exit_signal->cleanup_sighand path

Move 'tsk->sighand = NULL' from cleanup_sighand() to __exit_signal().  This
makes the exit path more understandable and allows us to do
cleanup_sighand() outside of ->siglock protected section.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 99855f694ebd..d04186d8cc68 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1151,7 +1151,7 @@ extern void exit_thread(void);
 
 extern void exit_files(struct task_struct *);
 extern void __cleanup_signal(struct signal_struct *);
-extern void cleanup_sighand(struct task_struct *);
+extern void __cleanup_sighand(struct sighand_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern NORET_TYPE void do_group_exit(int);
diff --git a/kernel/exit.c b/kernel/exit.c
index 22399caf7574..bc0ec674d3f4 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -114,10 +114,11 @@ static void __exit_signal(struct task_struct *tsk)
 	__unhash_process(tsk);
 
 	tsk->signal = NULL;
-	cleanup_sighand(tsk);
+	tsk->sighand = NULL;
 	spin_unlock(&sighand->siglock);
 	rcu_read_unlock();
 
+	__cleanup_sighand(sighand);
 	clear_tsk_thread_flag(tsk,TIF_SIGPENDING);
 	flush_sigqueue(&tsk->pending);
 	if (sig) {
diff --git a/kernel/fork.c b/kernel/fork.c
index aa50c848fae7..b3f7a1bb5e55 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -803,12 +803,8 @@ static inline int copy_sighand(unsigned long clone_flags, struct task_struct * t
 	return 0;
 }
 
-void cleanup_sighand(struct task_struct *tsk)
+void __cleanup_sighand(struct sighand_struct *sighand)
 {
-	struct sighand_struct * sighand = tsk->sighand;
-
-	/* Ok, we're done with the signal handlers */
-	tsk->sighand = NULL;
 	if (atomic_dec_and_test(&sighand->count))
 		kmem_cache_free(sighand_cachep, sighand);
 }
@@ -1233,7 +1229,7 @@ bad_fork_cleanup_mm:
 bad_fork_cleanup_signal:
 	cleanup_signal(p);
 bad_fork_cleanup_sighand:
-	cleanup_sighand(p);
+	__cleanup_sighand(p->sighand);
 bad_fork_cleanup_fs:
 	exit_fs(p); /* blocking */
 bad_fork_cleanup_files: