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[PATCH] cleanup __exit_signal->cleanup_sighand path

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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>
This commit is contained in:
Oleg Nesterov 2006-03-28 16:11:27 -08:00 committed by Linus Torvalds
parent 4a2c7a7837
commit a7e5328a06
3 changed files with 5 additions and 8 deletions
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2
include/linux/sched.h
View file

@ -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);

3
kernel/exit.c
View file

@ -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) {

8
kernel/fork.c
View file

@ -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: