linux-kernel - Re: [PATCH v2 0/4] Fix kselftest build with sub-directory

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Date:   Tue, 12 Jul 2022 20:27:44 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     Anders Roxell <anders.roxell@...aro.org>, Tim.Bird@...y.com,
        kernel@...labora.com, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v2 0/4] Fix kselftest build with sub-directory

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