linux-kernel - Re: [PATCH] devicetree: Move include prefixes from arch to separate directory

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Date:   Wed, 17 May 2017 22:54:34 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Olof Johansson <olof@...om.net>
Cc:     Russell King - ARM Linux <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mikael Starvik <starvik@...s.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        James Hogan <james.hogan@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frank Rowand <frowand.list@...il.com>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] devicetree: Move include prefixes from arch to separate directory

2017-05-16 2:04 GMT+09:00 Olof Johansson <olof@...om.net>:
> On Mon, May 15, 2017 at 8:48 AM, Russell King - ARM Linux
> <linux@...linux.org.uk> wrote:
>> On Mon, May 15, 2017 at 08:27:54AM -0700, Olof Johansson wrote:
>>> On Mon, May 15, 2017 at 7:47 AM, Rob Herring <robh+dt@...nel.org> wrote:
>>> > On Mon, May 15, 2017 at 9:26 AM, Russell King - ARM Linux
>>> > <linux@...linux.org.uk> wrote:
>>> >> Maybe what we should do is:
>>> >>
>>> >> mkdir include/dt
>>> >> git mv include/dt-bindings include/dt
>>> >> for arch in arch/*; do
>>> >>   dts=$arch/boot/dts
>>> >>   if [ -d $dts ]; then
>>> >>      a=include/dt/$(basename $arch)
>>> >>      ln -s $dts $a
>>> >>      git add $a
>>> >>   fi
>>> >> done
>>> >> ... fixup scripts/Makefile.lib ...
>>> >> git commit
>>> >
>>> > That would just break every existing include in dts files.
>>>
>>> It doesn't break dts includes if done together with a change in -I,
>>> but it might break includes from the driver side (or needs another -I
>>> there).
>>
>> Good point.
>>
>> We could leave include/dt-bindings where it is, and just do the rest of
>> it for the cross-arch includes.  Slightly less tidy but should have a
>> lower impact.
>
> I think you're proposing this?
> include/dt-bindings
> include/dt/$arch -> ../../arch/$arch/boot/dts/
>
> And then having -I$(srctree)include/dt as argument to dtc?
>
> That'd work but have the same drawback as I mentioned to Rob about
> having several -I statements at different levels of the include
> hierarchy, the same file could be reached through <dt/$arch/> and
> <$arch/>. Not a showstopper but since Rob seems to be OK with the link
> hierarchy living under scripts/dtc, I'd prefer to just stick to that.
>
> This is all pretty isolated, and if we want to move it somewhere else
> later for some reason, we should be able to do so without impacting
> DTS and drivers.
>




As I pointed out in
https://patchwork.kernel.org/patch/9726699/

/include/ "arm/foo.dtsi"
will make sense, so I'd like to to improve it some time later.


Anyway, this patch fixes the circular symlinks.

Reviewed-by: Masahiro Yamada <yamada.masahiro@...ionext.com>


-- 
Best Regards
Masahiro Yamada