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[PATCH] kill sigqueue->lock

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This lock is used in sigqueue_free(), but it is always equal to
current->sighand->siglock, so we don't need to keep it in the struct
sigqueue.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2005-10-30 15:02:17 -08:00 committed by Linus Torvalds
parent 932aeafbe8
commit 19a4fcb531
2 changed files with 4 additions and 7 deletions
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1
include/linux/signal.h
View file

@ -25,7 +25,6 @@
struct sigqueue {
struct list_head list;
spinlock_t *lock;
int flags;
siginfo_t info;
struct user_struct *user;

10
kernel/signal.c
View file

@ -277,7 +277,6 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
} else {
INIT_LIST_HEAD(&q->list);
q->flags = 0;
q->lock = NULL;
q->user = get_uid(t->user);
}
return(q);
@ -1371,11 +1370,12 @@ void sigqueue_free(struct sigqueue *q)
* pending queue.
*/
if (unlikely(!list_empty(&q->list))) {
read_lock(&tasklist_lock);
spin_lock_irqsave(q->lock, flags);
spinlock_t *lock = &current->sighand->siglock;
read_lock(&tasklist_lock);
spin_lock_irqsave(lock, flags);
if (!list_empty(&q->list))
list_del_init(&q->list);
spin_unlock_irqrestore(q->lock, flags);
spin_unlock_irqrestore(lock, flags);
read_unlock(&tasklist_lock);
}
q->flags &= ~SIGQUEUE_PREALLOC;
@ -1414,7 +1414,6 @@ send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
goto out;
}
q->lock = &p->sighand->siglock;
list_add_tail(&q->list, &p->pending.list);
sigaddset(&p->pending.signal, sig);
if (!sigismember(&p->blocked, sig))
@ -1462,7 +1461,6 @@ send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
* We always use the shared queue for process-wide signals,
* to avoid several races.
*/
q->lock = &p->sighand->siglock;
list_add_tail(&q->list, &p->signal->shared_pending.list);
sigaddset(&p->signal->shared_pending.signal, sig);