linux-kernel - Re: [PATCH v2 28/76] ARC: I/O and DMA Mappings

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Message-ID: <20130118160106.GD14019@linux-sh.org>
Date:	Sat, 19 Jan 2013 01:01:07 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 28/76] ARC: I/O and DMA Mappings

On Fri, Jan 18, 2013 at 03:55:43PM +0000, Arnd Bergmann wrote:
> On Friday 18 January 2013, Vineet Gupta wrote:
> > TBD: Do we need early ioremap support like openrisc
> > 
> > Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> 
> Can you explain why early ioremap is necessary for you?
> 
> I wasn't aware that openrisc has it. In a lot of cases,
> you can use fixmap as a replacement.
> 
The two don't need to be mutually exclusive, either. sh implements early
ioremap transparently via fixmaps for example:

	arch/sh/mm/ioremap.c
	arch/sh/mm/ioremap_fixed.c
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