linux-kernel - [PATCH 3/4] bug: completely remove code of disabled BUG

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Message-ID: <20120425112633.26927.71303.stgit@zurg>
Date:	Wed, 25 Apr 2012 15:26:33 +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 3/4] bug: completely remove code of disabled BUG_ON()

Even if CONFIG_BUG=n gcc generates code for some BUG_ON()

bloat-o-meter: add/remove: 2/9 grow/shrink: 25/229 up/down: 1053/-5019 (-3966)

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

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 2520a6e..aadb6fc 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -112,7 +112,7 @@ extern void warn_slowpath_null(const char *file, const int line);
 #endif
 
 #ifndef HAVE_ARCH_BUG_ON
-#define BUG_ON(condition) do { if (condition) ; } while(0)
+#define BUG_ON(condition) unused_expression(condition)
 #endif
 
 #ifndef HAVE_ARCH_WARN_ON

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