linux-kernel - Re: [PATCH v2] watchdog: Compile possible drivers with COMPILE

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Date:	Fri, 16 Oct 2015 14:05:26 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
CC:	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	linux-watchdog@...r.kernel.org, wim@...ana.be,
	javier@....samsung.com
Subject: Re: [PATCH v2] watchdog: Compile possible drivers with COMPILE_TEST

On 15/10/15 03:11, Krzysztof Kozlowski wrote:
> 2015-10-15 7:40 GMT+09:00 Guenter Roeck <linux@...ck-us.net>:
>> On 10/14/2015 03:11 PM, Luis de Bethencourt wrote:
>>>
>>> On 14/10/15 22:35, Guenter Roeck wrote:
>>>>
>>>> On 10/14/2015 11:55 AM, Luis de Bethencourt wrote:
>>>>>
>>>>> These drivers have depends that aren't build dependencies, so it's
>>>>> a good idea to allow these drivers to always be built when the
>>>>> COMPILE_TEST option is enabled.
>>>>>
>>>>> That way, the drivers can be built with a config generated by make
>>>>> allyesconfig and check if a patch would break the build.
>>>>>
>>>>> Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>
>>>>
>>>>
>>>> What architectures have you actually tested this for ?
>>>>
>>>> Guenter
>>>>
>>>
>>> I've compiled it in x86 and then I tried ARM
>>> (with CROSS_COMPILE="ccache arm-linux-gnueabihf-" ARCH=arm)
>>>
>>> But ARM kept failing due to other drivers, first Lustre then an Ethernet
>>> driver (I40E), and more.
>>>
>> arm:allmodconfig should build fine. Either case, you can always run "make
>> -i"
>> to ignore errors, to ensure that you at least don't introduce new problems.
>>
>>> Is there a better way of doing this?
>>>
>> Sure, at least run allmodconfig for _all_ architectures, or at least
>> for the major architectures.
> 
> At least 32-bit and 64-bit of mixtures. x86 and ARMv7 is not enough.
> For example something like:
> $ apt-get install build-essential gcc-4.8-multilib
> gcc-arm-linux-gnueabi gcc-aarch64-linux-gnu libc6-dev-arm64-cross
> gcc-powerpc-linux-gnu
> (PPC can be built for 32- and 64-bit)
> And you can get MIPS from CodeSourcery.
> 
> Toggling COMPILE_TEST with this may break someone's else allyesconfig.
> 
> Best regards,
> Krzysztof
> 

Hi Krysztof and Guenter,

Thanks for the help on how to build for all architectures.
I will do this in the future.

Building more drivers when compilation testing isn't worth the risk of making
somebody's allyesconfig break.

Thanks,
Luis
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