linux-kernel - Re: [PATCH RFC 0/2] use interpreters to invoke scripts

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Date:   Sun, 4 Oct 2020 08:51:36 +0200 (CEST)
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Ujjwal Kumar <ujjwalkumar0501@...il.com>
cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH RFC 0/2] use interpreters to invoke scripts



On Sat, 3 Oct 2020, Ujjwal Kumar wrote:

> This patch series aims at removing the dependency on execute 
> bit of the scripts in the kbuild system.
>

Ujjwal, your setup to send out the patch series created three unrelated 
emails rather than the default way, i.e., to have one cover letter 
and the patches in reply to the cover letter.

You can see the difference here:

https://lore.kernel.org/linux-kbuild/

The presentation of your patch series looks different than the other 
patch series on the list. Use the linux-kernel-mentees list for testing 
your setup.

For this version of the patch series, I guess it is okay; but this set up 
right for the next patch series.
 
> If not working with fresh clone of linux-next, clean the srctree:
> make distclean
> make tools/clean
>

I hit an unrelated issue on next-20201002 that make tools/clean fails.
Other than that, this is all good.
 
> To test the dependency on execute bits, I tried building the 
> kernel after removing x-bits for all files in the repository.
> Removing execute bits:
> for i in $(find -executable -type f); do chmod -x $i; done
>

Okay, I did that.
 
> Any attempts to configure (or build) the kernel fail because of 
> 'Permission denied' on scripts with the following error:
> $ make allmodconfig
> sh: ./scripts/gcc-version.sh: Permission denied
> init/Kconfig:34: syntax error
> init/Kconfig:33: invalid statement
> init/Kconfig:34: invalid statement
> sh: ./scripts/ld-version.sh: Permission denied
> init/Kconfig:39: syntax error
> init/Kconfig:38: invalid statement
> sh: ./scripts/clang-version.sh: Permission denied
> init/Kconfig:49: syntax error
> init/Kconfig:48: invalid statement
> make[1]: *** [scripts/kconfig/Makefile:71: allmodconfig] Error 1
> make: *** [Makefile:606: allmodconfig] Error 2
>

I can confirm that these errors are reported on next-20201002.
 
> Changes:
> 1. Adds specific interpreters (in Kconfig) to invoke 
> scripts.
> 
> After this patch I could successfully do a kernel build 
> without any errors.
>

With this first patch, I could then successfully do:

make allmodconfig && make

So far, so good. I did check the first patch.

Lukas

> 2. Again, adds specific interpreters to other parts of 
> kbuild system.
> 
> I could successfully perform the following make targets after 
> applying the PATCH 2/2:
> make headerdep
> make kselftest-merge
> make rpm-pkg
> make perf-tar-src-pkg
> make ARCH=ia64 defconfig
> ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make prepare
> 
> Following changes in PATCH 2/2 are not yet tested:
> arch/arm64/kernel/vdso32/Makefile
> arch/nds32/kernel/vdso/Makefile
> scripts/Makefile.build
> 
> Ujjwal Kumar (2):
>   kconfig: use interpreters to invoke scripts
>   kbuild: use interpreters to invoke scripts
> 
>  Makefile                          |  4 ++--
>  arch/arm64/kernel/vdso/Makefile   |  2 +-
>  arch/arm64/kernel/vdso32/Makefile |  2 +-
>  arch/ia64/Makefile                |  4 ++--
>  arch/nds32/kernel/vdso/Makefile   |  2 +-
>  init/Kconfig                      | 16 ++++++++--------
>  scripts/Makefile.build            |  2 +-
>  scripts/Makefile.package          |  4 ++--
>  8 files changed, 18 insertions(+), 18 deletions(-)
> 
> -- 
> 2.26.2
> 
>