linux-kernel - Re: [PATCH] drm: Only use DRM_IOCTL_UPDATE

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Date:	Fri, 20 Feb 2009 00:52:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	arnd@...db.de
Cc:	airlied@...ux.ie, benh@...nel.crashing.org,
	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: Only use DRM_IOCTL_UPDATE_DRAW compat wrapper for
 compat X86.

From: Arnd Bergmann <arnd@...db.de>
Date: Thu, 19 Feb 2009 15:19:01 +0100

> On Wednesday 18 February 2009, David Miller wrote:
> > drm: Only use DRM_IOCTL_UPDATE_DRAW compat wrapper for compat X86.
> > 
> > Only X86 32-bit uses a different alignment for "unsigned long long"
> > than it's 64-bit counterpart.
> > 
> > Therefore this compat translation is only correct, and only needed,
> > when either CONFIG_X86 or CONFIG_IA64.
> > 
> > Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> The patch is correct AFAICT, but I'd like to point out that the
> problem could have been avoided (besides using a non-padded layout)
> by using a compat_u64 member in the struct definition instead of
> the packed attribute:

Indeed, David A. showed me compat_u64 et al. and I'm fine with
it being fixed that way too.  Feel free to submit a patch :)
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