linux-kernel - Re: [PATCH] ARM: mmp: map sram as MT_MEMORY rather than MT

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Date:	Mon, 22 Aug 2011 19:13:35 -0700
From:	Andres Salomon <dilinger@...ued.net>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Leo Yan <leoy@...vell.com>, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Haojian Zhuang <hzhuang1@...vell.com>,
	Jon Nettleton <jon.nettleton@...il.com>,
	Eric Miao <eric.y.miao@...il.com>
Subject: Re: [PATCH] ARM: mmp: map sram as MT_MEMORY rather than MT_DEVICE

On Tue, 23 Aug 2011 01:07:55 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:
[...]
> > @@ -87,7 +88,8 @@ static int __devinit sram_probe(struct
> > platform_device *pdev) 
> >  	info->sram_phys   = (phys_addr_t)res->start;
> >  	info->sram_size   = resource_size(res);
> > -	info->sram_virt   = ioremap(info->sram_phys,
> > info->sram_size);
> > +	info->sram_virt   = __arm_ioremap(info->sram_phys,
> > info->sram_size,
> > +					  MT_MEMORY);
> 
> Not a good idea fiddling about under the covers like that.  The reason
> that MT_MEMORY is not in asm/io.h is to stop it being used like this -
> MT_MEMORY etc are not meant for general purpose use.
> 
> It needs to be looked at properly rather than working behind the APIs,
> and making my life a misery by doing so, preventing me from making
> changes where necessary by this kind of back-door use.
> 
> I guess we need a new ioremap_xxx() variant to cope with this.

Something like ioremap_exec()?  I have no idea what the related MT_
entry would be (as someone who's new to the ARM world, it's not
entirely clear what the semantic distinctions are between the various
MT_ entries).
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