linux-kernel - [PATCH] BUG(): CONFIG_BUG=n version of BUG() should be unreachable()

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Date:	Wed, 23 Dec 2009 04:17:12 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	arnd@...db.de
Cc:	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	sam@...nborg.org, dhowells@...hat.com,
	Alexander Beregalov <a.beregalov@...il.com>
Subject: [PATCH] BUG(): CONFIG_BUG=n version of BUG() should be unreachable()

Previouss definition of BUG() as 'do {} while(0)' produced compilation
warnings when BUG() was used in default branch of switch() statement
(control reaches end of non-void function).

Example:
unsigned long function()
{
	switch() {
	case 1:
		return 1;
	case 2:
		return 2;
	default:
		BUG();
}

Using unreachable() fixes the problem.

Signed-off-by: Alexander Beregalov <a.beregalov@...il.com>

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 18c435d..1106439 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -89,7 +89,7 @@ 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
-- 
1.6.6.rc4

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