linux-kernel - Re: [PATCH v6] pstore/ram: Add ramoops support for the Flattened Device Tree.

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Date:	Tue, 5 Jan 2016 17:04:46 -0800
From:	Kees Cook <keescook@...omium.org>
To:	Anton Vorontsov <anton@...msg.org>
Cc:	Bryan Freed <bfreed@...omium.org>, Arnd Bergmann <arnd@...db.de>,
	Rob Herring <robherring2@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Marco Stornelli <marco.stornelli@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olofj@...gle.com>
Subject: Re: [PATCH v6] pstore/ram: Add ramoops support for the Flattened
 Device Tree.

[thread necromancy, if you don't have the thread locally, it's here:
https://patchwork.kernel.org/patch/1426261/]

We still need to solve this, and John pinged me about it today. Where
does this stand?

-Kees


On Sun, Apr 14, 2013 at 7:24 AM, Anton Vorontsov <anton@...msg.org> wrote:
> On Mon, Apr 08, 2013 at 12:54:01PM -0700, Bryan Freed wrote:
> [...]
>> And as a more general question, why should we try not to put
>> configuration in the device tree?  It seems like a great (and
>> portable) place to put this stuff.
>> It certainly seems better to have it there than hardwired in the
>> kernel or tacked onto the kernel command line.
>
> But then we have two in-kernel APIs to pass kernel parameters? So we'll
> have to maintain two ways of passing the options for each driver. That is
> hardly a good solution.
>
> If you would like to see a convenient way to pass kernel/module options
> via the device tree, I would suggest implementing something like this:
>
> chosen {
>         kernel-options {
>                 linux,pstore.record-size = 123;
>                 linux,foo = "bar";
>         };
> };
>
> And then let the kernel translate all these to module_param_*().
>
> I am still not sure about placing the options along with devices layout,
> but if we go this route, then that is also viable:
>
> pstore-node {
>         linux,pstore.record-size = 123;
> };
>
> And translate "linux,*" this to module_param_*().
>
> How does that sound?
>
> Thanks,
> Anton



-- 
Kees Cook
Chrome OS & Brillo Security
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