linux-kernel - Re: BUG: via_drmclient.h is referenced but does not exist

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Message-ID: <20081215215143.GA16475@uranus.ravnborg.org>
Date:	Mon, 15 Dec 2008 22:51:43 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Thomas Hellström <thomas@...gstengraphics.com>
Cc:	Thomas Hellström <thomas@...pmail.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel <dri-devel@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>
Subject: Re: BUG: via_drmclient.h is referenced but does not exist

On Mon, Dec 15, 2008 at 10:26:27PM +0100, Thomas Hellström wrote:
> Hi!
> 
> Sam Ravnborg wrote:
> >On Sun, Dec 14, 2008 at 04:57:34PM +0100, Thomas Hellström wrote:
> >  
> >>Hi!
> >>
> >>The intention is for via_drm.h to be self-containing when included both 
> >>for a kernel build and for a user-space build. In this particular case, 
> >>via_drmclient.h lives in the user-space clients and includes stdint.h to 
> >>get access to uint32_t and friends.
> >>
> >>Of course, the user-space clients could
> >>#include "uint32.h"
> >>#include "via_drm.h"
> >>
> >>but shouldn't really the tools be mimicing what the compiler does in 
> >>this case?
> >>    
> >
> >The kernel headers and thus the kernel ABI is separate and ideally
> >they should not depend on any other header files to provide anything.
> >
> >This is why __u32, __u64 etc are preferred in the kernel ABI
> >and not uint32_t as used by the drm headers.
> >
> >We do not adhere to this as a strict rule (yet).
> >But if you do:
> >
> >grep -l uint32_t usr/include/linux
> >
> >then you will only see 7 hits. Out of 368 files.
> >So we are not bad in this respect.
> >
> >For drm the fix seems simple - just replace all of uint32_t with __u32.
> >likewise for the other 32 bit and the 64 bit variants.
> >  
> I'm not sure that's possible, as these header files are shared with *BSD 
> (and possibly Solaris).
I dunno about *BSD and solaris.

But other linux ABI header files do:

#include <linux/types.h>

To get access to these basic types.
And we could do the same for drm if the other systems does not prevent it.

	Sam
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