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

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Message-ID: <20151127195148.GB30871@n2100.arm.linux.org.uk>
Date:	Fri, 27 Nov 2015 19:51:48 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Tony Lindgren <tony@...mide.com>,
	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>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT
 "/chosen/linux,atags" entry

On Fri, Nov 27, 2015 at 01:27:23PM +0000, Russell King - ARM Linux wrote:
> It is possible to redirect any program to open any other file.  You can
> do it via a LD preload, and intercepting the open(), and possibly the
> read() calls if you want to do something more fancy.  The down-side is
> that you have to arrange for the preloaded object to be used by the
> linker, and the additional overhead it places on the intercepted
> functions.

Another idea if people don't like the preload idea.

We could create a zero-sized /proc/atags, and then use a bind mount in
userspace to bind some other file containing the required information
on top.  That could even be the atag blob from /sys/firmware/whatever.
The N700 (or whatever platform needs it) could be responsible for
creating the zero-sized /proc/atags so that we don't have it everywhere.

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