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Date: Fri, 22 Feb 2008 15:56:03 +0300
From: Pavel Emelyanov <xemul@...nvz.org>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Oleg Nesterov <oleg@...sign.ru>
Subject: [PATCH 3/3] Consolidate send_sigqueue and send_group_sigqueue
Both function do the same thing after proper locking, but
with different sigpening structs, so move the common code
into a helper.
After this we have 4 places that look very similar:
send_sigqueue: calls do_send_sigqueue and signal_wakeup
send_group_sigqueue: calls do_send_sigqueue and __group_complete_signal
__group_send_sig_info: calls send_signal and __group_complete_signal
specific_send_sig_info: calls send_signal and signal_wakeup
Besides, send_signal performs actions similar to do_send_sigqueue's
and __group_complete_signal - to signal_wakeup.
It looks like they can be consolidated gracefully.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
---
kernel/signal.c | 86 ++++++++++++++++++------------------------------------
1 files changed, 29 insertions(+), 57 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index 8b1b404..c6bb821 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1291,10 +1291,33 @@ void sigqueue_free(struct sigqueue *q)
__sigqueue_free(q);
}
+static int do_send_sigqueue(int sig, struct sigqueue *q, struct task_struct *t,
+ struct sigpending *pending)
+{
+ if (unlikely(!list_empty(&q->list))) {
+ /*
+ * If an SI_TIMER entry is already queue just increment
+ * the overrun count.
+ */
+
+ BUG_ON(q->info.si_code != SI_TIMER);
+ q->info.si_overrun++;
+ return 0;
+ }
+
+ if (sig_ignored(t, sig))
+ return 1;
+
+ signalfd_notify(t, sig);
+ list_add_tail(&q->list, &pending->list);
+ sigaddset(&pending->signal, sig);
+ return 0;
+}
+
int send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
{
unsigned long flags;
- int ret = 0;
+ int ret = -1;
BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
@@ -1308,37 +1331,14 @@ int send_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
*/
rcu_read_lock();
- if (!likely(lock_task_sighand(p, &flags))) {
- ret = -1;
+ if (!likely(lock_task_sighand(p, &flags)))
goto out_err;
- }
- if (unlikely(!list_empty(&q->list))) {
- /*
- * If an SI_TIMER entry is already queue just increment
- * the overrun count.
- */
- BUG_ON(q->info.si_code != SI_TIMER);
- q->info.si_overrun++;
- goto out;
- }
- /* Short-circuit ignored signals. */
- if (sig_ignored(p, sig)) {
- ret = 1;
- goto out;
- }
- /*
- * Deliver the signal to listening signalfds. This must be called
- * with the sighand lock held.
- */
- signalfd_notify(p, sig);
+ ret = do_send_sigqueue(sig, q, p, &p->pending);
- list_add_tail(&q->list, &p->pending.list);
- sigaddset(&p->pending.signal, sig);
if (!sigismember(&p->blocked, sig))
signal_wake_up(p, sig == SIGKILL);
-out:
unlock_task_sighand(p, &flags);
out_err:
rcu_read_unlock();
@@ -1350,7 +1350,7 @@ int
send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
{
unsigned long flags;
- int ret = 0;
+ int ret;
BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
@@ -1359,38 +1359,10 @@ send_group_sigqueue(int sig, struct sigqueue *q, struct task_struct *p)
spin_lock_irqsave(&p->sighand->siglock, flags);
handle_stop_signal(sig, p);
- /* Short-circuit ignored signals. */
- if (sig_ignored(p, sig)) {
- ret = 1;
- goto out;
- }
-
- if (unlikely(!list_empty(&q->list))) {
- /*
- * If an SI_TIMER entry is already queue just increment
- * the overrun count. Other uses should not try to
- * send the signal multiple times.
- */
- BUG_ON(q->info.si_code != SI_TIMER);
- q->info.si_overrun++;
- goto out;
- }
- /*
- * Deliver the signal to listening signalfds. This must be called
- * with the sighand lock held.
- */
- signalfd_notify(p, sig);
-
- /*
- * Put this signal on the shared-pending queue.
- * We always use the shared queue for process-wide signals,
- * to avoid several races.
- */
- list_add_tail(&q->list, &p->signal->shared_pending.list);
- sigaddset(&p->signal->shared_pending.signal, sig);
+ ret = do_send_sigqueue(sig, q, p, &p->signal->shared_pending);
__group_complete_signal(sig, p);
-out:
+
spin_unlock_irqrestore(&p->sighand->siglock, flags);
read_unlock(&tasklist_lock);
return ret;
--
1.5.3.4
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