linux-kernel - [PATCH] signals: do_signal_stop: kill the SIGNAL

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Date:	Sat, 31 May 2008 20:15:33 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] signals: do_signal_stop: kill the SIGNAL_UNKILLABLE check

fae5fa44f1fd079ffbed8e0add929dd7bbd1347f changed do_signal_stop() to check
SIGNAL_UNKILLABLE, this wasn't needed. If signal_group_exit() == F, the
signal sent to SIGNAL_UNKILLABLE task must be already filtered out by the
caller, get_signal_to_deliver(). And if signal_group_exit() == T we are not
going to stop.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 26-rc2/kernel/signal.c~2_DSS_KILL_UNKILLABLE_CHECK	2008-05-31 14:54:32.000000000 +0400
+++ 26-rc2/kernel/signal.c	2008-05-31 16:03:39.000000000 +0400
@@ -1649,8 +1649,7 @@ static int do_signal_stop(int signr)
 	} else {
 		struct task_struct *t;
 
-		if (unlikely((sig->flags & (SIGNAL_STOP_DEQUEUED | SIGNAL_UNKILLABLE))
-					 != SIGNAL_STOP_DEQUEUED) ||
+		if (!likely(sig->flags & SIGNAL_STOP_DEQUEUED) ||
 		    unlikely(signal_group_exit(sig)))
 			return 0;
 		/*

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