linux-kernel - Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

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Message-ID: <alpine.LFD.2.20.1512151222020.26920@knanqh.ubzr>
Date:	Tue, 15 Dec 2015 12:24:52 -0500 (EST)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Pali Rohár <pali.rohar@...il.com>,
	Tony Lindgren <tony@...mide.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Sebastian Reichel <sre@...ian.org>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, Rob Herring <robherring2@...il.com>,
	Pavel Machek <pavel@....cz>,
	Grant Likely <grant.likely@...aro.org>,
	linux-omap@...r.kernel.org, Frank Rowand <frowand.list@...il.com>,
	Andreas Färber <afaerber@...e.de>
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT
 "/chosen/linux,atags" entry

On Tue, 15 Dec 2015, Russell King - ARM Linux wrote:

> On Tue, Dec 15, 2015 at 10:33:25AM +0100, Pali Rohár wrote:
> > So am I understand correctly that solution would be to hack
> > arch/arm/mm/mmu.c to not overwrite page at PHYS_OFFSET?
> 
> That's completely unnecessary: there are enough platform hooks to cope
> with whatever the platform requires.

Indeed.  I didn't notice that mdesc->reserve() exists these days and is 
perfect for this purpose as you say.


Nicolas