linux-kernel - Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

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Date:   Mon, 29 Jan 2018 16:22:50 -0800
From:   Frank Rowand <frowand.list@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Pantelis Antoniou <panto@...oniou-consulting.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

On 01/29/18 06:08, Geert Uytterhoeven wrote:
> Hi Frank,
> 
> On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list@...il.com> wrote:
>> From: Frank Rowand <frank.rowand@...y.com>
>>
>> Move duplicating and unflattening of an overlay flattened devicetree
>> (FDT) into the overlay application code.  To accomplish this,
>> of_overlay_apply() is replaced by of_overlay_fdt_apply().
>>
>> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
>> code, which is thus responsible for freeing the duplicate FDT.  The
>> caller of of_overlay_fdt_apply() remains responsible for freeing the
>> original FDT.
>>
>> The unflattened device tree (aka expanded device tree, EDT) now
>> belongs to devicetree code, which is thus responsible for freeing
>> the EDT.
>>
>> These ownership changes prevent early freeing of the duplicated FDT
>> or the EDT, which could result in use after free errors.
>>
>> These changes led to migrating some unittest overlay data into
>> their own devicetree source files, and then converting most of
>> them to use sugar syntax instead of hand coding fragments.
> 
> Thanks for your series!
> 
>> Frank Rowand (2):
>>   of: change overlay apply input data from EDT to FDT
>>   of: convert unittest overlay devicetree source to sugar syntax
> 
> Do you plan to update Documentation/devicetree/overlay-notes.txt
> and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?

Thanks for the pointers.

I will add updates to Documentation/devicetree/overlay-notes.txt in
this series.

The changes to Documentation/devicetree/bindings/fpga/fpga-region.txt
are related to the relatively new sugar syntax in dtc, not to the
changes introduced by this patch series.  I'll create a patch outside
this series to update this documentation.


> 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
>