linux-kernel - Re: [PATCH 04/98] drm_mode.h: use __u32 and _

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Date:	Sat, 30 May 2015 21:58:14 +0200
From:	Frans Klaver <fransklaver@...il.com>
To:	Mikko Rapeli <mikko.rapeli@....fi>
Cc:	linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 04/98] drm_mode.h: use __u32 and __u64 from linux/types.h

On Sat, May 30, 2015 at 05:37:56PM +0200, Mikko Rapeli wrote:
> Fixes userspace compilation error:
> 
> drm/drm_mode.h:472:2: error: unknown type name ‘uint32_t’

It's even more or less required by the coding style. Chapter 5
(typedefs) says:

 (e) Types safe for use in userspace.

     In certain structures which are visible to userspace, we cannot
     require C99 types and cannot use the 'u32' form above. Thus, we
     use __u32 and similar types in all structures which are shared
     with userspace.

So this is probably an improvement in any case.

Thanks,
Frans

> 
> Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
> ---
>  include/uapi/drm/drm_mode.h | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index dbeba94..03e4d75 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -508,14 +508,14 @@ struct drm_mode_crtc_page_flip {
>  
>  /* create a dumb scanout buffer */
>  struct drm_mode_create_dumb {
> -	uint32_t height;
> -	uint32_t width;
> -	uint32_t bpp;
> -	uint32_t flags;
> +	__u32 height;
> +	__u32 width;
> +	__u32 bpp;
> +	__u32 flags;
>  	/* handle, pitch, size will be returned */
> -	uint32_t handle;
> -	uint32_t pitch;
> -	uint64_t size;
> +	__u32 handle;
> +	__u32 pitch;
> +	__u64 size;
>  };
>  
>  /* set up for mmap of a dumb scanout buffer */
> @@ -532,7 +532,7 @@ struct drm_mode_map_dumb {
>  };
>  
>  struct drm_mode_destroy_dumb {
> -	uint32_t handle;
> +	__u32 handle;
>  };
>  
>  /* page-flip flags are valid, plus: */
> -- 
> 2.1.4
> 
> --
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