linux-kernel - Re: headers_check warnings in drm headers

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Date:	Tue, 17 Aug 2010 08:45:50 +1000
From:	Dave Airlie <airlied@...hat.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: headers_check warnings in drm headers

On Sun, 2010-08-15 at 21:23 +0200, Sam Ravnborg wrote:
> When I ran "make headers_check" on upstream I got following
> set of warnings for the drm headers:
> 
> usr/include/drm/drm_mode.h:85: found __[us]{8,16,32,64} type without #include <linux/types.h>
> usr/include/drm/i915_drm.h:120: found __[us]{8,16,32,64} type without #include <linux/types.h>
> usr/include/drm/mga_drm.h:260: found __[us]{8,16,32,64} type without #include <linux/types.h>
> usr/include/drm/radeon_drm.h:758: found __[us]{8,16,32,64} type without #include <linux/types.h>
> usr/include/drm/via_drm.h:117: found __[us]{8,16,32,64} type without #include <linux/types.h>
> 
> When I looked through the files I noticed a few things:
> 
> 1) Several files uses a mixture of native types and linux types.
>    For example "unsigned int" and "__u32" in the same file.
> 2) drm.h contains:
> #if defined(__linux__)
> 
> #include <linux/types.h>
> #include <asm/ioctl.h>
> typedef unsigned int drm_handle_t;
> 
> #else /* One of the BSDs */
> 
> #include <sys/ioccom.h>
> #include <sys/types.h>
> typedef int8_t   __s8;
> typedef uint8_t  __u8;
> typedef int16_t  __s16;
> typedef uint16_t __u16;
> typedef int32_t  __s32;
> typedef uint32_t __u32;
> typedef int64_t  __s64;
> typedef uint64_t __u64;
> typedef unsigned long drm_handle_t;
> 
> #endif
> 
> Why this when no-one else require this treatment?
> 
> 3) Lots of typedefs...
> 
> All in all - too much to dig into without knowing
> the background for the current state.
> 
> At a minimum please get the warnings fixed.

At a minimum please fix the checker to work.

It doesn't recurse, all of the .h files include drm.h, which includes
linux/types.h, this is how its meant to work. If the checker does
recurse then doesn't define __linux__ then fix that. This isn't a bug in
the drm header files.

We copy these files as is into a userspace that is shared with FreeBSD,
the ifdef is the minimum down from about 10 ifdefs 2-3 years ago
concession we've made.

Dave.

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