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From: David Daney <ddaney@caviumnetworks.com>
To: torvalds@linux-foundation.org, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	David Daney <ddaney@caviumnetworks.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	x86@kernel.org
Subject: [PATCH 02/11] x86: Convert BUG() to use unreachable()
Date: Mon, 14 Sep 2009 14:55:31 -0700	[thread overview]
Message-ID: <1252965340-31735-2-git-send-email-ddaney@caviumnetworks.com> (raw)
In-Reply-To: <4AAEBAC2.1050905@caviumnetworks.com>

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@caviumnetworks.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Ingo Molnar <mingo@redhat.com>
CC: x86@kernel.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


  parent reply	other threads:[~2009-09-14 21:56 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-14 21:50 [PATCH 00/11] Add support for GCC's __builtin_unreachable() and use it in BUG (v2) David Daney
2009-09-14 21:50 ` David Daney
2009-09-14 21:50 ` David Daney
2009-09-14 21:50 ` David Daney
2009-09-14 21:55 ` [PATCH 01/11] Add support for GCC-4.5's __builtin_unreachable() to compiler.h (v2) David Daney
2009-09-14 21:55 ` David Daney [this message]
2009-09-14 21:55 ` [PATCH 03/11] MIPS: Convert BUG() to use unreachable() David Daney
2009-09-15  8:39   ` [PATCH] MIPS: Make more use of unreachable() Ralf Baechle
2009-09-14 21:55 ` [PATCH 04/11] s390: Convert BUG() to use unreachable() David Daney
2009-09-14 21:55 ` [PATCH 05/11] mn10300: " David Daney
2009-09-14 21:55 ` [PATCH 06/11] parisc: " David Daney
2009-09-14 21:55 ` [PATCH 07/11] powerpc: " David Daney
2009-09-14 21:55   ` David Daney
2009-09-14 21:55 ` [PATCH 08/11] alpha: " David Daney
2009-09-14 21:55 ` [PATCH 09/11] avr32: " David Daney
2009-09-14 21:55 ` [PATCH 10/11] blackfin: " David Daney
2009-09-14 21:55   ` David Daney
2009-09-14 21:55 ` [PATCH 11/11] Use unreachable() in asm-generic/bug.h for !CONFIG_BUG case David Daney
2009-09-14 23:12   ` Brian Gerst
2009-09-14 23:12     ` Brian Gerst
2009-09-14 23:28     ` David Daney
2009-09-14 23:39       ` Linus Torvalds
2009-09-14 23:39         ` Linus Torvalds
2009-09-15 15:35         ` David Daney
2009-09-14 23:54       ` Brian Gerst
2009-09-14 23:54         ` Brian Gerst
2009-09-15 16:02         ` David Daney

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