linux-kernel - Re: [PATCH v3 3/3] DT: proc: Add runtime overlay interface in /proc

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Date:	Fri, 8 Nov 2013 12:00:01 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	Joel Becker <jlbec@...lplan.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] DT: proc: Add runtime overlay interface in /proc

On Fri, Nov 08, 2013 at 05:06:10PM +0200, Pantelis Antoniou wrote:
> Add a runtime interface to /proc to enable generic device tree overlay
> usage.
> 

Hi Pantelis,

> ---
>  fs/proc/proc_devtree.c | 278 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 278 insertions(+)
> 
[ ... ]

> +
> +		/* start at 256K at first */
> +		if (od->alloc == 0)
> +			od->alloc = SZ_256K / 2;
> +

I have to include <linux/sizes.h> to get this to build.

Also, even though /proc/device-tree-overlay is supposed to be write only, I get
this:

# cat /proc/device-tree-overlay
cat: [  651.973568] overlay_proc_release: failed to unflatten tree
/proc/device-tree-overlay: Input/output error

which seems to be a bit odd. I did not spend any time to track it down, though.

Otherwise, the code seems to be working well.

Thanks,
Guenter
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