linux-kernel - Re: [PATCH 07/18] sysctl extern cleanup

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Date:	Sat, 20 Feb 2010 15:51:56 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Gerd Hoffmann <kraxel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 07/18] sysctl extern cleanup - compat

On Saturday 20 February 2010 15:13:28 Dave Young wrote:
> Extern declarations in sysctl.c should be move to their own head file,
> and then include them in relavant .c files.
> 
> Move compat_log extern declaration to linux/compat.h
> 
> Signed-off-by: Dave Young <hidave.darkstar@...il.com>

Good idea in principle, but please don't enclose the extern
declaration in #ifdef:

> --- linux-2.6.32.orig/include/linux/compat.h	2010-02-20 14:02:24.334925488 +0800
> +++ linux-2.6.32/include/linux/compat.h	2010-02-20 14:24:30.405627048 +0800
> @@ -17,6 +17,9 @@
>  #include <asm/siginfo.h>
>  #include <asm/signal.h>
>  
> +#ifdef CONFIG_SYSCTL
> +extern int compat_log;
> +#endif
>  #define compat_jiffies_to_clock_t(x)	\
>  		(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)

This will force a rebuild of everything that #includes linux/compat.h when CONFIG_SYSCTL
changes, while nothing really changes.

Obviously, the same goes for the entire series.

	Arnd
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