linux-kernel - [PATCH 2/3] __mutex_lock_common: use signal_pending

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Message-ID: <20080608172042.GA10386@tv-sign.ru>
Date:	Sun, 8 Jun 2008 21:20:42 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] __mutex_lock_common: use signal_pending_state()

Change __mutex_lock_common() to use signal_pending_state() for the sake of
the code re-use.

This adds 7 bytes to kernel/mutex.o, but afaics only because gcc isn't smart
enough.

(btw, uninlining of __mutex_lock_common() shrinks .text from 2722 to 1542,
 perhaps it is worth doing).

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

--- 26-rc2/kernel/mutex.c~2_MUTEX_USE_HELPER	2008-06-04 22:05:53.000000000 +0400
+++ 26-rc2/kernel/mutex.c	2008-06-08 19:08:32.000000000 +0400
@@ -165,10 +165,7 @@ __mutex_lock_common(struct mutex *lock, 
 		 * got a signal? (This code gets eliminated in the
 		 * TASK_UNINTERRUPTIBLE case.)
 		 */
-		if (unlikely((state == TASK_INTERRUPTIBLE &&
-					signal_pending(task)) ||
-			      (state == TASK_KILLABLE &&
-					fatal_signal_pending(task)))) {
+		if (unlikely(signal_pending_state(state, task))) {
 			mutex_remove_waiter(lock, &waiter,
 					    task_thread_info(task));
 			mutex_release(&lock->dep_map, 1, ip);

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