[PATCH] signal handling: revert sigkill priority fix

This patch reverts commit c33880aa since
it's not needed anymore. As pointed out by Roland McGrath the real fix
is to deliver all signals before returning to user space.
See http://www.ussg.iu.edu/hypermail/linux/kernel/0509.2/0683.html
A fix for s390 has been merged.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

kernel/signal.c

@@ -513,16 +513,7 @@ static int __dequeue_signal(struct sigpending *pending, sigset_t *mask,
 {
 	int sig = 0;
 
-	/* SIGKILL must have priority, otherwise it is quite easy
-	 * to create an unkillable process, sending sig < SIGKILL
-	 * to self */
-	if (unlikely(sigismember(&pending->signal, SIGKILL))) {
-		if (!sigismember(mask, SIGKILL))
-			sig = SIGKILL;
-	}
-
-	if (likely(!sig))
-		sig = next_signal(pending, mask);
+	sig = next_signal(pending, mask);
 	if (sig) {
 		if (current->notifier) {
 			if (sigismember(current->notifier_mask, sig)) {