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Message-ID: <20080308151024.GA25188@tv-sign.ru>
Date: Sat, 8 Mar 2008 18:10:24 +0300
From: Oleg Nesterov <oleg@...sign.ru>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>,
Roland McGrath <roland@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] signals: fold complete_signal() into send_signal/do_send_sigqueue
From: Pavel Emelyanov <xemul@...nvz.org>
Factor out complete_signal() callsites. This change completely unifies the
helpers sending the specific/group signals.
Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>
Signed-off-by: Oleg Nesterov <oleg@...sign.ru>
--- 25/kernel/signal.c~4_CS_FACTOR 2008-03-08 16:37:23.000000000 +0300
+++ 25/kernel/signal.c 2008-03-08 16:54:57.000000000 +0300
@@ -826,7 +826,8 @@ static int send_signal(int sig, struct s
out_set:
sigaddset(&pending->signal, sig);
- return 1;
+ complete_signal(sig, t, group);
+ return 0;
}
int print_fatal_signals;
@@ -861,17 +862,16 @@ static int __init setup_print_fatal_sign
__setup("print-fatal-signals=", setup_print_fatal_signals);
+int
+__group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
+{
+ return send_signal(sig, info, p, 1);
+}
+
static int
specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t)
{
- int ret;
-
- ret = send_signal(sig, info, t, 0);
- if (ret <= 0)
- return ret;
-
- complete_signal(sig, t, 0);
- return 0;
+ return send_signal(sig, info, t, 0);
}
/*
@@ -914,24 +914,6 @@ force_sig_specific(int sig, struct task_
force_sig_info(sig, SEND_SIG_FORCED, t);
}
-int
-__group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
-{
- int ret;
-
- /*
- * Put this signal on the shared-pending queue, or fail with EAGAIN.
- * We always use the shared queue for process-wide signals,
- * to avoid several races.
- */
- ret = send_signal(sig, info, p, 1);
- if (ret <= 0)
- return ret;
-
- complete_signal(sig, p, 1);
- return 0;
-}
-
/*
* Nuke all other threads in the group.
*/
@@ -1263,6 +1245,7 @@ static int do_send_sigqueue(int sig, str
{
struct sigpending *pending;
+ BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
handle_stop_signal(sig, t);
if (unlikely(!list_empty(&q->list))) {
@@ -1283,6 +1266,7 @@ static int do_send_sigqueue(int sig, str
pending = group ? &t->signal->shared_pending : &t->pending;
list_add_tail(&q->list, &pending->list);
sigaddset(&pending->signal, sig);
+ complete_signal(sig, t, group);
return 0;
}
@@ -1292,8 +1276,6 @@ int send_sigqueue(int sig, struct sigque
unsigned long flags;
int ret = -1;
- BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
-
/*
* The rcu based delayed sighand destroy makes it possible to
* run this without tasklist lock held. The task struct itself
@@ -1307,8 +1289,6 @@ int send_sigqueue(int sig, struct sigque
ret = do_send_sigqueue(sig, q, p, 0);
- complete_signal(sig, p, 0);
-
unlock_task_sighand(p, &flags);
out_err:
return ret;
@@ -1320,15 +1300,11 @@ send_group_sigqueue(int sig, struct sigq
unsigned long flags;
int ret;
- BUG_ON(!(q->flags & SIGQUEUE_PREALLOC));
-
/* Since it_lock is held, p->sighand cannot be NULL. */
spin_lock_irqsave(&p->sighand->siglock, flags);
ret = do_send_sigqueue(sig, q, p, 1);
- complete_signal(sig, p, 1);
-
spin_unlock_irqrestore(&p->sighand->siglock, flags);
return ret;
--
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