linux-kernel - Re: [Patch] Always include <linux/types.h>

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Message-ID: <20081105172312.GA10585@x200.localdomain>
Date:	Wed, 5 Nov 2008 20:23:12 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Jörn Engel <joern@...fs.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] Always include <linux/types.h>

On Wed, Nov 05, 2008 at 05:39:41PM +0100, Jörn Engel wrote:
> Hardly any file in the kernel can be compiled without including
> <linux/types.h>, directly or indirectly.  And I'd wager a beer that
> noone can find a non-trivial example.  I couldn't.
> 
> So instead of sprinkling even more #include <linux/types.h> everywhere -
> 140 headers in include/linux/ would need that to compile standalone -
> let us just pass it automatically.
> 
> The existing 4000 odd includes for types.h, plus some 300 each for
> compiler.h and stddef.h, which get pulled through types.h, can get
> removed at leasure.
> 
> --- a/Makefile
> +++ b/Makefile
> @@ -326,7 +326,8 @@ AFLAGS_KERNEL	=
>  # Needed to be compatible with the O= option
>  LINUXINCLUDE    := -Iinclude \
>                     $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
> -		   -include include/linux/autoconf.h
> +		   -include include/linux/autoconf.h \
> +		   -include include/linux/types.h

This is only going to slow down compilation and types.h is not causing much
compilation problems, in fact, I can't recall a compilation problem due to
types.h. Contary to config.h situation which was a pain.
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