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Subject: Re: [PATCH v2 0/4] Fix kselftest build with sub-directory
To:     Guillaume Tucker <guillaume.tucker@collabora.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Shuah Khan <shuah@kernel.org>,
        Kees Cook <keescook@chromium.org>
Cc:     Anders Roxell <anders.roxell@linaro.org>, Tim.Bird@sony.com,
        kernel@collabora.com, linux-kbuild@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        Shuah Khan <skhan@linuxfoundation.org>
References: <cover.1657614127.git.guillaume.tucker@collabora.com>
From:   Shuah Khan <skhan@linuxfoundation.org>
Message-ID: <d32187ae-8e8a-72ad-d422-3d3b47101160@linuxfoundation.org>
Date:   Tue, 12 Jul 2022 20:27:44 -0600
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On 7/12/22 2:29 AM, Guillaume Tucker wrote:
> Earlier attempts to get "make O=build kselftest-all" to work were
> not successful as they made undesirable changes to some functions
> in the top-level Makefile.  This series takes a different
> approach by removing the root cause of the problem within
> kselftest, which is when the sub-Makefile tries to install kernel
> headers "backwards" by calling make with the top-level Makefile.
> The actual issue comes from the fact that $(srctree) is ".." when
> building in a sub-directory with "O=build" which then obviously
> makes "-C $(top_srcdir)" point outside of the real source tree.
> 
> With this series, the generic kselftest targets work as expected
> from the top level with or without a build directory e.g.:
> 
>    $ make kselftest-all
> 
>    $ make O=build kselftest-all
> 
> Then in order to build using the sub-Makefile explicitly, the
> headers have to be installed first.  This is arguably a valid
> requirement to have when building a tool from a sub-Makefile.
> For example, "make -C tools/testing/nvdimm/" fails in a similar
> way until <asm/rwonce.h> has been generated by a kernel build.
> 
> v2: replace headers_install with headers
> 

I already applied the series. Please send me patches I can apply
on top of the ones in linux-kselftest next branch.

thanks,
-- Shuah