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

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Date:	Mon, 01 Dec 2014 14:55:48 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Jason Cooper <jason@...edaemon.net>,
	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 2014-11-28 15:10, Linus Walleij wrote:
> 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.

Still, the dependency on the 'prepare' target is superfluous, if the
only requirement is that $(KERNELRELEASE) be set properly.

Michal

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