linux-kernel - Re: [PATCH v2] kbuild: buildtar: add arm64 dtbs support

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Message-ID: <20200628174606.GA19923@dumbo>
Date:   Sun, 28 Jun 2020 19:46:06 +0200
From:   Domenico Andreoli <domenico.andreoli@...ux.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v2] kbuild: buildtar: add arm64 dtbs support

On Sun, Jun 28, 2020 at 12:46:28PM +0900, Masahiro Yamada wrote:
> On Sun, Jun 28, 2020 at 6:21 AM Domenico Andreoli
> <domenico.andreoli@...ux.com> wrote:
> >
> > On Sat, Jun 27, 2020 at 09:02:52PM +0900, Masahiro Yamada wrote:
> > > On Sat, Jun 27, 2020 at 6:40 AM Domenico Andreoli <domenico.andreoli@...ux.com> wrote:
> > > > On Fri, Jun 26, 2020 at 03:16:58PM +0900, Masahiro Yamada wrote:
> > > > > On Fri, Jun 26, 2020 at 5:51 AM Domenico Andreoli <domenico.andreoli@...ux.com> wrote:
> >
> > [...]
> >
> > > > > >
> > > > > > +       arm64)
> > > > > > +               make ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_DTBS_PATH="${tmpdir}/boot/dtbs/${KERNELRELEASE}" dtbs_install
> > > > > > +               ;;
> > > > > > +esac
> > > > > > +
> > > > >
> > > > >
> > > > > Or, you can use INSTALL_PATH="${tmpdir}/boot"
> > > > > to make it shorter.
> > > >
> > > > This does not work, INSTALL_DTBS_PATH gets somehow defined along the
> > > > twisted path to buildtar and therefore needs to be explicitly specified
> > > > for the new destination.
> > >
> > > It works.
> > >
> > > See line 1002 of the top Makefile
> > >
> > > export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
> >
> > Exactly. INSTALL_DTBS_PATH is _exported_ in the top Makefile.
> >
> >
> > This is what it seems to happen, in the order:
> >
> > 1. outer 'make dir-pkg'
> >    INSTALL_DTBS_PATH is exported with some content
> >
> > 2. control arrives to buildtar
> >    INSTALL_DTBS_PATH is there as environment variable
> >
> > 3. inner 'make INSTALL_PATH=${tmpdir}/boot dtbs_install'
> >    INSTALL_DTBS_PATH is already set, therefore it is not modified
> 
> Sorry, I was wrong.
> Your analysis is definitely right.
> 
> 
> I will apply v4.
> 
> Thanks.
> 

Thanks to you!

Domenico

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