linux-kernel - [PATCH 4/4] bug: mark disabled BUG() as unreachable() code

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Message-ID: <20120425112636.26927.27124.stgit@zurg>
Date:	Wed, 25 Apr 2012 15:26:36 +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 4/4] bug: mark disabled BUG() as unreachable() code

This patch suppress some compiler warnings (if CONFIG_BUG=n)
"warning: control reaches end of non-void function"

Plus now gcc can throw out some dead code.
bloat-o-meter: add/remove: 1/1 grow/shrink: 68/173 up/down: 1569/-5607 (-4038)

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 aadb6fc..0b08199 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -108,7 +108,7 @@ extern void warn_slowpath_null(const char *file, const int line);
 
 #else /* !CONFIG_BUG */
 #ifndef HAVE_ARCH_BUG
-#define BUG() do {} while(0)
+#define BUG() unreachable()
 #endif
 
 #ifndef HAVE_ARCH_BUG_ON

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