From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.22-rc4-mm2: kvm compile breakage with X86_CMPXCHG64=n
Date: Tue, 12 Jun 2007 15:03:57 -0700
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	<20070612000718.GS3588@stusta.de>
	<20070612032224.GA19293@redhat.com>
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Cc: Adrian Bunk <bunk@stusta.de>, avi@qumranet.com,
	linux-kernel@vger.kernel.org, kvm-devel@lists.sourceforge.net
To: Dave Jones <davej@redhat.com>
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On Mon, 11 Jun 2007 23:22:24 -0400
Dave Jones <davej@redhat.com> wrote:

> Add -Werror-implicit-function-declaration
> This makes builds fail sooner if something is implicitly defined instead
> of having to wait half an hour for it to fail at the linking stage.
> 
> Signed-off-by: Dave Jones <davej@redhat.com>
> 
> --- linux-2.6/Makefile~	2007-06-04 16:46:24.000000000 -0400
> +++ linux-2.6/Makefile	2007-06-04 16:46:53.000000000 -0400
> @@ -313,7 +313,8 @@ LINUXINCLUDE    := -Iinclude \
>  CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
>  
>  CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
> -                   -fno-strict-aliasing -fno-common
> +		   -fno-strict-aliasing -fno-common \
> +		   -Werror-implicit-function-declaration
>  AFLAGS          := -D__ASSEMBLY__
>  
>  # Read KERNELRELEASE from include/config/kernel.release (if it exists)

This causes the i386 allmodconfig build to fail:

include/linux/uaccess.h: In function 'pagefault_disable':
include/linux/uaccess.h:23: error: implicit declaration of function '__memory_barrier'

I didn't look to see why...