linux-kernel - [PATCH] bug: Fix CONFIG_BUG=n BUG

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Message-ID: <53A2E573.6080407@acm.org>
Date:	Thu, 19 Jun 2014 15:28:19 +0200
From:	Bart Van Assche <bvanassche@....org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Josh Triplett <josh@...htriplett.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] bug: Fix CONFIG_BUG=n BUG_ON()

Patch "bug: Make BUG() always stop the machine" changed the
behavior of BUG() with CONFIG_BUG=n from a no-op into an infinite
loop. Modify the definition of BUG_ON() accordingly such that the
behavior of BUG_ON(1) is identical to that of BUG().

Signed-off-by: Bart Van Assche <bvanassche@....org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Josh Triplett <josh@...htriplett.org>
Cc: Andrew Morton <akpm@...ux-foundation.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 630dd23..f3241cd 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -142,7 +142,7 @@ 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) do { } while (unlikely(condition))
 #endif
 
 #ifndef HAVE_ARCH_WARN_ON
-- 
1.8.4.5

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