linux-kernel - Re: [PATCH v4 4/6] arm: add early

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Date:	Wed, 26 Feb 2014 09:59:20 -0500
From:	Mark Salter <msalter@...hat.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Arnd Bergmann <arnd@...db.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Linaro Patches <patches@...aro.org>
Subject: Re: [PATCH v4 4/6] arm: add early_ioremap support

On Tue, 2014-02-25 at 23:48 -0600, Rob Herring wrote:
> > +#define NR_FIX_BTMAPS          32
> > +#define FIX_BTMAPS_SLOTS       7
> > +#define TOTAL_FIX_BTMAPS       (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
> > +#define FIX_BTMAP_END          FIX_KMAP_BEGIN
> > +#define FIX_BTMAP_BEGIN                (FIX_BTMAP_END +
> TOTAL_FIX_BTMAPS - 1)
> 
> Why the different logic from arm64? Specifically, it doesn't make
> adding a permanent mapping simple.

I looked at adding support for permanent mappings but it was going to
take more time than I had. Also on ARM, we have to deal with kmap's
needs as well. Working that out was going to take more time than I
had. I think getting the patch in now to support early_ioremap is
the way to go. Adding support for permanent mappings can be done
later with the early console support for which it is needed.


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