linux-kernel - [PATCH 2/4] bug: completely remove code of disabled VM_BUG

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Message-ID: <20120425112629.26927.21609.stgit@zurg>
Date:	Wed, 25 Apr 2012 15:26:29 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 2/4] bug: completely remove code of disabled VM_BUG_ON()

Even if CONFIG_DEBUG_VM=n gcc genereates code for some VM_BUG_ON()

bloat-o-meter: add/remove: 0/1 grow/shrink: 10/120 up/down: 185/-1889 (-1704)

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 include/linux/mmdebug.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index c04ecfe..9c9a2a0 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -4,7 +4,7 @@
 #ifdef CONFIG_DEBUG_VM
 #define VM_BUG_ON(cond) BUG_ON(cond)
 #else
-#define VM_BUG_ON(cond) do { (void)(cond); } while (0)
+#define VM_BUG_ON(cond) unused_expression(cond)
 #endif
 
 #ifdef CONFIG_DEBUG_VIRTUAL

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