linux-kernel - Re: [PATCH v4 2/8] OF: Introduce DT overlay support.

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Message-ID: <CAMuHMdUWfQ=2xPhNsS36mT6nv-CfR3_1exZ+5qYgdkjbBntrWg@mail.gmail.com>
Date:	Thu, 15 May 2014 09:20:24 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.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>,
	Guenter Roeck <linux@...ck-us.net>,
	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>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>
Subject: Re: [PATCH v4 2/8] OF: Introduce DT overlay support.

Hi Pantelis,

On Thu, May 15, 2014 at 9:12 AM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
>> We also need to think about kexec. Kexec works by sucking the live tree
>> out of the kernel and creating a .dtb from it to pass to the new kernel.
>> What will the rules be when kexecing? Do all the overlays need to be
>> removed, or does the kernel get the tree with all the overlays applied
>> (in which case none of the overlays can be removed on the other side of
>> kexec).
>
> We can add a sysfs attribute that configures whether overlays are reverted before
> kexec or not. I can't really tell which is the correct option, so let's allow the
> policy up to user-space.

Kexec'ing into a new kernel doesn't change the hardware, so IMHO the
in-kernel DT should not change.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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