linux-kernel - [PATCH] Fix new warnings in real mode code

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Date:	Mon, 18 Aug 2008 09:06:01 +0200
From:	"Andi Kleen" <andi@...stfloor.org>
To:	torvalds@...l.org
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Paul Jackson <pj@....com>, mingo@...e.hu, hpa@...or.com
Subject: [PATCH] Fix new warnings in real mode code

From: Andi Kleen <ak@...ux.intel.com>

This recent patch

commit c3965bd15118742d72b4bc1a290d37b3f081eb98
Author: Paul Jackson <pj@....com>
Date:   Wed May 14 08:15:34 2008 -0700

    x86 boot: proper use of ARRAY_SIZE instead of repeated E820MAX constant

caused these new warnings during a normal build:

In file included from linux-2.6/arch/x86/boot/memory.c:17:
linux-2.6/include/linux/log2.h: In function '__ilog2_u32':
linux-2.6/include/linux/log2.h:34: warning: implicit declaration of function 'fls'
linux-2.6/include/linux/log2.h: In function '__ilog2_u64':
linux-2.6/include/linux/log2.h:42: warning: implicit declaration of function 'fls64'
linux-2.6/include/linux/log2.h: In function '__roundup_pow_of_two ':
linux-2.6/include/linux/log2.h:63: warning: implicit declaration of function 'fls_long'

I tried to fix them in log2.h, but it's difficult because the real mode
environment is completely different from a normal kernel environment. Instead
define an own ARRAY_SIZE macro in boot.h, similar to the other private
macros there.

Cc: Paul Jackson <pj@....com>
Cc: mingo@...e.hu
Cc: hpa@...or.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/boot/boot.h   |    2 ++
 arch/x86/boot/memory.c |    1 -
 2 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index 616b804..cc0ef13 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -30,6 +30,8 @@
 /* Useful macros */
 #define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
 
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
+
 extern struct setup_header hdr;
 extern struct boot_params boot_params;
 
diff --git a/arch/x86/boot/memory.c b/arch/x86/boot/memory.c
index 53165c9..8c3c25f 100644
--- a/arch/x86/boot/memory.c
+++ b/arch/x86/boot/memory.c
@@ -13,7 +13,6 @@
  */
 
 #include "boot.h"
-#include <linux/kernel.h>
 
 #define SMAP	0x534d4150	/* ASCII "SMAP" */
 
-- 
1.5.6

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