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

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Date:   Sat, 3 Oct 2020 20:49:09 +0530
From:   Ujjwal Kumar <ujjwalkumar0501@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Ujjwal Kumar <ujjwalkumar0501@...il.com>,
        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: [PATCH RFC 0/2] use interpreters to invoke scripts

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

If not working with fresh clone of linux-next, clean the srctree:
make distclean
make tools/clean

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

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

Changes:
1. Adds specific interpreters (in Kconfig) to invoke 
scripts.

After this patch I could successfully do a kernel build 
without any errors.

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