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authorOleg Nesterov <oleg@tv-sign.ru>2005-10-30 15:02:17 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 17:37:19 -0800
commit19a4fcb531659f2f7d18b5d04cee039176e9540d (patch)
tree30e0636d6163a5c0c3a4ad41c2d5f49cd858b457
parent932aeafbe8521a9a9d790152d66020e0fef2029b (diff)
[PATCH] kill sigqueue->lock
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>
-rw-r--r--include/linux/signal.h1
-rw-r--r--kernel/signal.c10
2 files changed, 4 insertions, 7 deletions
diff --git a/include/linux/signal.h b/include/linux/signal.h
index 7be18b5e2fb..5dd5f02c5c5 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -25,7 +25,6 @@
struct sigqueue {
struct list_head list;
- spinlock_t *lock;
int flags;
siginfo_t info;
struct user_struct *user;
diff --git a/kernel/signal.c b/kernel/signal.c
index 6904bbbfe11..8d6e64dfa5c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -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);