linux-kernel - Re: [PATCH v3 6/9] kbuild: consolidate Devicetree dtb build rules

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Date:   Mon, 1 Oct 2018 08:25:03 -0500
From:   Rob Herring <robh@...nel.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:H8/300 ARCHITECTURE" 
        <uclinux-h8-devel@...ts.sourceforge.jp>,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        nios2-dev@...ts.rocketboards.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-xtensa@...ux-xtensa.org, Will Deacon <will.deacon@....com>,
        Paul Burton <paul.burton@...s.com>,
        Ley Foon Tan <ley.foon.tan@...el.com>
Subject: Re: [PATCH v3 6/9] kbuild: consolidate Devicetree dtb build rules

On Mon, Oct 1, 2018 at 12:49 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> Hi Rob,
>
>
> 2018年9月29日(土) 0:43 Rob Herring <robh@...nel.org>:
>
> > +#
> > ---------------------------------------------------------------------------
> > +# Devicetree files
> > +
> > +ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
> > +dtstree := arch/$(SRCARCH)/boot/dts
> > +endif
> > +
> > +ifneq ($(dtstree),)
> > +
> > +%.dtb : scripts_dtc
>
> %.dtb: prepare3 prepare

I assume you didn't mean to drop scripts_dtc as that doesn't work.

Why "prepare" here and not on dtbs?

> because we need to make sure KERNELRELEASE
> is correctly defined before dtbs_install happens.

Yes, indeed. With prepare3 added I get:

cp: cannot create regular file
'/boot/dtbs/4.19.0-rc3-00009-g0afba9b7b2ea-dirty': No such file or
directory

vs. with it:

cp: cannot create regular file '/boot/dtbs/': Not a directory

>
>
> > +       $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
> > +
> > +PHONY += dtbs dtbs_install
> > +dtbs: scripts_dtc
>
>
> dtbs: prepare3 scripts_dtc
>
>
>
> > +       $(Q)$(MAKE) $(build)=$(dtstree)
> > +
> > +dtbs_install: dtbs
>
>
> Please do not have dtbs_install to depend on dtbs.
>
> No install targets should ever trigger building anything
> in the source tree.
>
>
> For the background, see the commit log of
> 19514fc665ffbce624785f76ee7ad0ea6378a527

Okay, thanks.

Rob