Re: [PATCH] Makefile: Fix separate output directory build of kselftests

[Muhammad Usama Anjum <usama.anjum@collabora.com>]

On 3/9/22 2:19 AM, Shuah Khan wrote:
> On 3/8/22 1:11 AM, Muhammad Usama Anjum wrote:
>> On 3/4/22 2:32 AM, Shuah Khan wrote:
>>> On 2/23/22 12:10 PM, Muhammad Usama Anjum wrote:
>>>> Build of kselftests fail if kernel's top most Makefile is used for
>>>> running or building kselftests with separate output directory. The
>>>> absolute path is needed to reference other files during this kind of
>>>> build. Set KBUILD_ABS_SRCTREE to use absolute path during the build. It
>>>> fixes the following different types of errors:
>>>>
>>>> make kselftest-all O=/linux_mainline/build
>>>> Makefile:1080: ../scripts/Makefile.extrawarn: No such file or directory
>>>>
>>>> make kselftest-all O=build
>>>> Makefile:1080: ../scripts/Makefile.extrawarn: No such file or directory
>>>>
>>>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
>>>> ---
>>>> I've tested this patch on top of next-20220217. The latest
>>>> next-20220222
>>>> have missing patches.
>>>
>>> Can you give more details on the use-cases you tested? Did you test all
>>> the ways kselftest are built?
>>>
>> Yeah, I've tried to test all the ways. Here are the different ways I've
>> used to test it:
>> 1) Same directory build of kselftest (this is already working)
>> make kselftest
>> make kselftest-all
>> make kselftest-install
>> make kselftest-clean
>> make kselftest-gen_tar
>>
>> 2) These were failing when separate output directory is specified either
>> as relative or absolute path. After adding this patch, these are also
>> working. kselfetst.rst mentions separate output directory build in
>> this way.
>> make kselftest O=build
>> make kselftest-all O=build
>> make kselftest-install O=build
>> make kselftest-clean O=build
>> make kselftest-gen_tar O=build
>>
>> make kselftest O=/build
>> make kselftest-all O=/build
>> make kselftest-install O=/build
>> make kselftest-clean O=/build
>> make kselftest-gen_tar O=/build
>>
>> Tested on top of next-20220307 after applying this patch.
>>
> 
> Thank you for testing all these use-cases. This is a good comprehensive
> list. Do you mind sending a doc patch for
> 
> Documentation/dev-tools/kselftest.rst
> 
> The text here could almost as is as a new section after
> 
> Contributing new tests (details) with a new section that outlines
> the tests to run when adding a new test to selftests/Makefile
> and making changes to kselftest common frameowork: selftests/Makefile,
> selftests/lib.mk
Hi Shuah,

Yeah, definitely I can write and contribute it. I've noted this. This is
the last patch I want to get accepted, then I plan to update the
kselftest documentation (with the things you have mentioned and a few
more things) and write a blog about how KernelCI has helped in all this.
> 
> Let me know if you are unable to, I will send a patch in.
> 
> thanks,
> -- Shuah

-- 
Muhammad Usama Anjum