linux-kernel - Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

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Date:	Mon, 15 Apr 2013 19:29:08 +0530
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Michal Marek <mmarek@...e.cz>,
	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	<linux-kbuild@...r.kernel.org>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH] Kbuild: Avoid DTB rebuilds if source files are untouched

On 04/13/2013 03:22 AM, Stephen Warren wrote:
>
> After installing the ARC toolchain (which was a bit painful to track
> down and install...) 

Sorry about that - we have a buildroot based distro about to be pushed upstream -
that would make it easier.

> I reproduced your exact problem. I believe the
> patch below fixes it:
>
> diff --git a/arch/arc/boot/dts/Makefile b/arch/arc/boot/dts/Makefile
> index 5776835..2f2cf23 100644
> --- a/arch/arc/boot/dts/Makefile
> +++ b/arch/arc/boot/dts/Makefile
> @@ -8,6 +8,8 @@ endif
>  obj-y   += $(builtindtb-y).dtb.o
>  targets += $(builtindtb-y).dtb
>
> +.SECONDARY: $(obj)/$(builtindtb-y).dtb.S
> +
>  dtbs:  $(addprefix  $(obj)/, $(builtindtb-y).dtb)
>
>  clean-files := *.dtb

Indeed it does - I fell stupid why this didn't occur to me. But given that you
have dealt with the dtb Makefile stuff alot more than I have :-) do you know why
it was not working when put in Makefile.lib because I feel a few other arches also
suffer from the same issue and would need similar fixes.

Anyhow, for the patch, I can manually add --author="you" but it'll still lack your
SOB - you OK with that or do you want to send a formal patch.

Thx,
-Vineet


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