linux-kernel - [PATCH v1 04/20] signal: add copy

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Date:   Mon, 28 May 2018 23:53:39 +0200
From:   Christian Brauner <christian@...uner.io>
To:     linux-kernel@...r.kernel.org
Cc:     ebiederm@...ssion.com, gregkh@...uxfoundation.org,
        mingo@...nel.org, james.morris@...rosoft.com,
        keescook@...omium.org, peterz@...radead.org, sds@...ho.nsa.gov,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
        oleg@...hat.com, Christian Brauner <christian@...uner.io>
Subject: [PATCH v1 04/20] signal: add copy_pending() helper

Instead of using a goto for this let's add a simple helper copy_pending()
which can be called in both places.

Signed-off-by: Christian Brauner <christian@...uner.io>
---
v0->v1:
* patch unchanged
---
 kernel/signal.c | 54 +++++++++++++++++++++++++++----------------------
 1 file changed, 30 insertions(+), 24 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index bc750fb4ddcc..baae137455eb 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -515,6 +515,19 @@ int unhandled_signal(struct task_struct *tsk, int sig)
 	return !tsk->ptrace;
 }
 
+static void copy_pending(siginfo_t *info, struct sigqueue *first,
+			 bool *resched_timer)
+{
+	list_del_init(&first->list);
+	copy_siginfo(info, &first->info);
+
+	*resched_timer = (first->flags & SIGQUEUE_PREALLOC) &&
+			 (info->si_code == SI_TIMER) &&
+			 (info->si_sys_private);
+
+	__sigqueue_free(first);
+}
+
 static void collect_signal(int sig, struct sigpending *list, siginfo_t *info,
 			   bool *resched_timer)
 {
@@ -526,8 +539,10 @@ static void collect_signal(int sig, struct sigpending *list, siginfo_t *info,
 	*/
 	list_for_each_entry(q, &list->list, list) {
 		if (q->info.si_signo == sig) {
-			if (first)
-				goto still_pending;
+			if (first) {
+				copy_pending(info, first, resched_timer);
+				return;
+			}
 			first = q;
 		}
 	}
@@ -535,29 +550,20 @@ static void collect_signal(int sig, struct sigpending *list, siginfo_t *info,
 	sigdelset(&list->signal, sig);
 
 	if (first) {
-still_pending:
-		list_del_init(&first->list);
-		copy_siginfo(info, &first->info);
-
-		*resched_timer =
-			(first->flags & SIGQUEUE_PREALLOC) &&
-			(info->si_code == SI_TIMER) &&
-			(info->si_sys_private);
-
-		__sigqueue_free(first);
-	} else {
-		/*
-		 * Ok, it wasn't in the queue.  This must be
-		 * a fast-pathed signal or we must have been
-		 * out of queue space.  So zero out the info.
-		 */
-		clear_siginfo(info);
-		info->si_signo = sig;
-		info->si_errno = 0;
-		info->si_code = SI_USER;
-		info->si_pid = 0;
-		info->si_uid = 0;
+		copy_pending(info, first, resched_timer);
+		return;
 	}
+
+	/*
+	 * Ok, it wasn't in the queue. This must be a fast-pathed signal or we
+	 * must have been out of queue space. So zero out the info.
+	 */
+	clear_siginfo(info);
+	info->si_signo = sig;
+	info->si_errno = 0;
+	info->si_code = SI_USER;
+	info->si_pid = 0;
+	info->si_uid = 0;
 }
 
 static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
-- 
2.17.0