linux-kernel - Re: [PATCH] fb.h: ARM uses __raw

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Message-Id: <201106131537.10698.arnd@arndb.de>
Date:	Mon, 13 Jun 2011 15:37:10 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Russell King <linux@....linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH] fb.h: ARM uses __raw_{read/write}

On Monday 13 June 2011 12:08:19 Catalin Marinas wrote:
> The change proposed by Hartley wouldn't make much difference from the
> current volatile accesses (__raw_* accessors are implemented as volatile
> on ARM).

I guess it would mainly make a difference if we get a platform where
the PCI bus window is not in the same address space as the regular
physical memory and the accessors actually need to do a computation
on the address. AFAICT, ARM does not currently have any such platform
and I would hope that it says that way.

> I think the memcpy_(from|to)io could be optimised on ARM to only add a
> barrier before or after he copying loop.

Agreed, good idea.

	Arnd
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