linux-kernel - Re: [PATCH] kbuild: fix dependency of dtbs targets

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Message-ID: <20171009145558.GC28164@arm.com>
Date:   Mon, 9 Oct 2017 15:55:59 +0100
From:   Will Deacon <will.deacon@....com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org, Ley Foon Tan <lftan@...era.com>,
        linux-kernel@...r.kernel.org, nios2-dev@...ts.rocketboards.org,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] kbuild: fix dependency of dtbs targets

On Wed, Oct 04, 2017 at 01:27:20PM +0900, Masahiro Yamada wrote:
> The target "dtbs" should depend on "scripts" because it needs to
> build dtc.  The "prepare" target is unneeded here.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  arch/arm/Makefile   | 2 +-
>  arch/arm64/Makefile | 2 +-
>  arch/nios2/Makefile | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 47d3a1a..cdb5b55 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -342,7 +342,7 @@ $(INSTALL_TARGETS):
>  
>  PHONY += dtbs dtbs_install
>  
> -dtbs: prepare scripts
> +dtbs: scripts
>  	$(Q)$(MAKE) $(build)=$(boot)/dts
>  
>  dtbs_install:
> diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
> index 939b310..fd56fbc 100644
> --- a/arch/arm64/Makefile
> +++ b/arch/arm64/Makefile
> @@ -133,7 +133,7 @@ zinstall install:
>  
>  PHONY += dtbs dtbs_install
>  
> -dtbs: prepare scripts
> +dtbs: scripts
>  	$(Q)$(MAKE) $(build)=$(boot)/dts
>  
>  dtbs_install:

I think this is ok, although I was initially nervous about the possibility
of the archprepare step having interactions with the dt-bindings headers.
That doesn't appear to be the case, so for arm64:

Acked-by: Will Deacon <will.deacon@....com>

Will