linux-kernel - [PATCH 2/5] x86: Convert BUG() to use unreachable()

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Date:	Fri,  4 Dec 2009 17:44:51 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	David Daney <ddaney@...iumnetworks.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: [PATCH 2/5] x86: Convert BUG() to use unreachable()

Use the new unreachable() macro instead of for(;;);.  When
allyesconfig is built with a GCC-4.5 snapshot on i686 the size of the
text segment is reduced by 3987 bytes (from 6827019 to 6823032).

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
Acked-by: "H. Peter Anvin" <hpa@...or.com>
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: x86@...nel.org
---
 arch/x86/include/asm/bug.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index d9cf1cd..f654d1b 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -22,14 +22,14 @@ do {								\
 		     ".popsection"				\
 		     : : "i" (__FILE__), "i" (__LINE__),	\
 		     "i" (sizeof(struct bug_entry)));		\
-	for (;;) ;						\
+	unreachable();						\
 } while (0)
 
 #else
 #define BUG()							\
 do {								\
 	asm volatile("ud2");					\
-	for (;;) ;						\
+	unreachable();						\
 } while (0)
 #endif
 
-- 
1.6.2.5

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