[PATCH 2.6.16-mm1] cleanup __exit_signal->cleanup_sighand path

[Oleg Nesterov]

This patch moves '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@xxxxxxxxxx>

--- MM/include/linux/sched.h~1_ESCS	2006-03-23 22:48:10.000000000 +0300
+++ MM/include/linux/sched.h	2006-03-23 23:00:02.000000000 +0300
@@ -1184,7 +1184,7 @@ 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);
--- MM/kernel/fork.c~1_ESCS	2006-03-23 22:48:10.000000000 +0300
+++ MM/kernel/fork.c	2006-03-23 22:59:33.000000000 +0300
@@ -808,12 +808,8 @@ static inline int copy_sighand(unsigned 
 	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);
 }
@@ -1232,7 +1228,7 @@ 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:
--- MM/kernel/exit.c~1_ESCS	2006-03-23 22:48:10.000000000 +0300
+++ MM/kernel/exit.c	2006-03-23 23:02:53.000000000 +0300
@@ -114,10 +114,11 @@ static void __exit_signal(struct task_st
 	__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) {
-
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