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

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Message-ID: <3245119.krc4KB3uae@wuerfel>
Date:	Wed, 25 Nov 2015 22:29:53 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Pavel Machek <pavel@....cz>,
	Frank Rowand <frowand.list@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Laura Abbott <lauraa@...eaurora.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robherring2@...il.com>,
	Will Deacon <will.deacon@....com>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Andreas Färber <afaerber@...e.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

On Wednesday 25 November 2015 13:03:10 Tony Lindgren wrote:
> * Arnd Bergmann <arnd@...db.de> [151125 11:50]:
> > On Wednesday 25 November 2015 10:16:44 Tony Lindgren wrote:
> > > At least I don't have better solutions in mind.
> > 
> > I would be happier if we could restrict this as much as possible to the
> > boards that need it, as an opt-in. That way it doesn't become an ABI
> > for people that don't already rely in this information. How about
> > adding a check the code adds the linux,atags property to do it
> > only for a whitelist of board numbers?
> 
> Or populate /proc/atags only for the ones that need it from machine
> specific init_early?

That would also address my main concern about /proc/atags, but still
leave the atags in /proc/device-tree/chosen/linux,atags, and it would
be bad if someone who currently uses /proc/atags changes their code
to use the other file instead of finding a proper solution.

	Arnd
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