linux-kernel - Re: [PATCH v1] kbuild: fix sub directory output build of kselftests

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Date:   Mon, 27 Jun 2022 13:51:06 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kieran Bingham <kbingham@...nel.org>, kernel@...labora.com,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v1] kbuild: fix sub directory output build of kselftests

On 6/27/22 11:45 AM, Masahiro Yamada wrote:
> On Tue, Jun 28, 2022 at 1:54 AM Shuah Khan <skhan@...uxfoundation.org> wrote:
>>
>> On 6/27/22 1:02 AM, 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 which is
>>> sub-directory. srctree is set to .. erroneously.
>>>
>>> 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
>>>
>>> Fix this by comparing abs_srctree with CURDIR instead of abs_objtree.
>>> CURDIR changes based on from where the command has been run and it sets
>>> the srctree correctly.
>>>
>>> Fixes: 25b146c5b8cee("kbuild: allow Kbuild to start from any directory")
>>> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
>>> ---
>>> Changes in V2:
>>> - Correct the bugfix instead of workaround
>>>
>>> V1: https://lore.kernel.org/lkml/20220223191016.1658728-1-usama.anjum@collabora.com/
>>> ---
>>>    Makefile | 4 ++--
>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/Makefile b/Makefile
>>> index e66358b64ede..4090d7afcda4 100644
>>> --- a/Makefile
>>> +++ b/Makefile
>>> @@ -238,12 +238,12 @@ ifeq ($(need-sub-make),)
>>>    # so that IDEs/editors are able to understand relative filenames.
>>>    MAKEFLAGS += --no-print-directory
>>>
>>> -ifeq ($(abs_srctree),$(abs_objtree))
>>> +ifeq ($(abs_srctree),$(CURDIR))
>>>            # building in the source tree
>>>            srctree := .
>>>        building_out_of_srctree :=
>>>    else
>>> -        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
>>> +        ifeq ($(abs_srctree)/,$(dir $(CURDIR)))
>>>                    # building in a subdirectory of the source tree
>>>                    srctree := ..
>>>            else
>>>
>>
>> Please resend cc'ing linux-kselftest
>>
>> thanks,
>> -- Shuah
> 
> 
> Please do not send this any more.
> This part is good as is.
> 

+ linux-kselftest@...r.kernel.org

The reason I suggested resending cc'ing linux-kselftest is because
this fixes a kselftest problem.

I am assuming this patch will go through kbuild

Acked-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah