linux-kernel - Re: [PATCH v3 4/4] Documentation: ABI: /sys/firmware/devicetree/overlays

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Date:	Mon, 27 Apr 2015 20:11:38 +0200
From:	Greg KH <greg@...ah.com>
To:	Pantelis Antoniou <panto@...oniou-consulting.com>
Cc:	Rob Herring <robherring2@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Porter <mporter@...sulko.com>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v3 4/4] Documentation: ABI:
 /sys/firmware/devicetree/overlays

On Mon, Apr 27, 2015 at 08:51:20PM +0300, Pantelis Antoniou wrote:
> Hi Greg,
> 
> > On Apr 24, 2015, at 23:31 , Greg KH <greg@...ah.com> wrote:
> > 
> > On Fri, Apr 24, 2015 at 12:45:44PM +0300, Pantelis Antoniou wrote:
> >> Documentation ABI entry for overlays sysfs entries.
> >> 
> >> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> >> ---
> >> .../ABI/testing/sysfs-firmware-devicetree-overlays | 23 ++++++++++++++++++++++
> >> 1 file changed, 23 insertions(+)
> >> create mode 100644 Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
> >> 
> >> diff --git a/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
> >> new file mode 100644
> >> index 0000000..6b81f1c
> >> --- /dev/null
> >> +++ b/Documentation/ABI/testing/sysfs-firmware-devicetree-overlays
> >> @@ -0,0 +1,23 @@
> >> +What:		/sys/firmware/devicetree/overlays/
> >> +Date:		March 2015
> >> +Contact:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
> >> +Description:
> >> +		This directory contains the applied device tree overlays of
> >> +		the running system, as directories of the overlay id.
> > 
> > "as"?
> > 
> >> +
> >> +		enable: The master enable switch, by default is 1, and when
> >> +		        set to 0 it cannot be re-enabled for security reasons.
> > 
> > What are those reasons?
> > 
> 
> There’s a whole subthread with Grant & Kees going over security concerns.
> 
> http://comments.gmane.org/gmane.linux.drivers.devicetree/101871

Great, document it here please, so that others know this :)

thanks,

greg k-h
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