linux-kernel - Re: [PATCH] fbmem: Fix fb_read, fb

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Date:	Fri, 17 Sep 2010 20:17:04 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	james@...anarts.com
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fbdev@...r.kernel.org, airlied@...hat.com,
	akpm@...ux-foundation.org, marcin.slusarz@...il.com,
	FlorianSchandinat@....de, vda.linux@...glemail.com,
	jbarnes@...tuousgeek.org, jsimmons@...radead.org
Subject: Re: [PATCH] fbmem: Fix fb_read, fb_write unaligned accesses.

From: James Hogan <james@...anarts.com>
Date: Sat, 18 Sep 2010 01:23:47 +0100

> Apologies for corrupted patch. I'll try again.
> Comments? I'd also appreciate if somebody familiar with sbus on sparc
> could check this patch is sane since I know virtually nothing about sbus
> and am not in a position to compile for sparc, let alone test on it:
> 
> fb_{read,write} access the framebuffer using lots of fb_{read,write}l's
> but don't check that the file position is aligned which can cause
> problems on some architectures which do not support unaligned accesses.
> 
> Since the operations are essentially memcpy_{from,to}io, new
> fb_memcpy_{from,to}fb macros have been defined and these are used
> instead.
> 
> For Sparc, fb_{read,write} macros use sbus_{read,write}, so this defines
> new sbus_memcpy_{from,to}io functions the same as memcpy_{from,to}io but
> using sbus_{read,write}b instead of {read,write}b.
> 
> Signed-off-by: James Hogan <james@...anarts.com>

Compiles cleanly on sparc and looks correct to me:

Acked-by: David S. Miller <davem@...emloft.net>
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