linux-kernel - Re: [PATCH 05/98] exynos_drm.h: use _

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Message-ID: <20150530164655.GM2067@n2100.arm.linux.org.uk>
Date:	Sat, 30 May 2015 17:46:56 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Mikko Rapeli <mikko.rapeli@....fi>
Cc:	linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	David Airlie <airlied@...ux.ie>,
	Seung-Woo Kim <sw0312.kim@...sung.com>,
	dri-devel@...ts.freedesktop.org, Inki Dae <inki.dae@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>, linux-api@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/98] exynos_drm.h: use __u64 from linux/types.h

On Sat, May 30, 2015 at 05:37:57PM +0200, Mikko Rapeli wrote:
> Fixes userspace compilation error:
> 
> drm/exynos_drm.h:30:2: error: unknown type name ‘uint64_t’
> 
> Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>

This is another thing which we need to address.  We should not be using
unsigned int/unsigned long/uintXX_t/etc in here, but the __uXX and __sXX
types.

The lesson learned from other DRM developers is that using these types
simplifies the API especially when it comes to the differences between
32-bit and 64-bit machines, and compat applications.

Note that drm/drm.h is all that should need to be included - drm/drm.h
takes care of including linux/types.h when building on Linux platforms.
(note: if your compiler doesn't set __linux__ then you're probably not
using the proper compiler...)

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