linux-kernel - Re: [PATCH] ARM: kbuild: Fix forced rebuild after 'make dtbs'

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Date:	Fri, 28 Nov 2014 15:10:30 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jason Cooper <jason@...edaemon.net>, Michal Marek <mmarek@...e.cz>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: kbuild: Fix forced rebuild after 'make dtbs'

On Wed, Nov 26, 2014 at 3:41 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Wed, Nov 26, 2014 at 02:57:42PM +0100, Linus Walleij wrote:
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 u300_defconfig
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 zImage CONFIG_DEBUG_SECTION_MISMATCH=y
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 dtbs
>> make -f Makefile -j5 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
>> KBUILD_OUTPUT=build-u300 zImage CONFIG_DEBUG_SECTION_MISMATCH=y
>>
>> -> Rebuilds everything.
>>
>> This doesn't occur before the offending commit. So it only happens
>> when specifying extra environment variables on the command line.
>
> I suspect if you also provide the CONFIG_DEBUG_SECTION_MISMATCH=y on the
> dtbs line, everything will work properly.

Yay, it works! :)

> The problem is that dtbs line executes a prepare, which I guess rebuilds
> the bounds stuff.  So, the dtbs target results in it being rebuilt without
> the section mismatch, and then you re-execute a make with it, causing
> the bounds stuff to be rebuilt again.

Yep. Not very intuitive to require passing section mismatch debug
flags to DTB rebuilding but whatever, it's not so bad I can't live with
it.

Strange that it worked before.

Yours,
Linus Walleij
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