linux-kernel - Re: [PATCH v3 00/15] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL

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Date:   Mon, 9 May 2022 03:28:55 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nicolas Schier a <nicolas@...sle.eu>,
        Ard Biesheuvel <ardb@...nel.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-um@...ts.infradead.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v3 00/15] kbuild: yet another series of cleanups (modpost,
 LTO, MODULE_REL_CRCS)

On Thu, May 5, 2022 at 4:24 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
>
> This is the third batch of cleanups in this development cycle.
>
> Major changes in v3:
>
>  - Generate symbol CRCs as C code, and remove CONFIG_MODULE_REL_CRCS.
>
> Major changes in v2:
>
>  - V1 did not work with CONFIG_MODULE_REL_CRCS.
>    I fixed this for v2.
>
>  - Reflect some review comments in v1
>
>  - Refactor the code more
>
>  - Avoid too long argument error
>
>
> Masahiro Yamada (15):
>   modpost: mitigate false-negatives for static EXPORT_SYMBOL checks
>   modpost: change the license of EXPORT_SYMBOL to bool type
>   modpost: merge add_{intree_flag,retpoline,staging_flag} to add_header
>   modpost: move *.mod.c generation to write_mod_c_files()
>   kbuild: generate a list of objects in vmlinux
>   kbuild: record symbol versions in *.cmd files
>   modpost: extract symbol versions from *.cmd files
>   kbuild: link symbol CRCs at final link, removing
>     CONFIG_MODULE_REL_CRCS
>   kbuild: stop merging *.symversions
>   genksyms: adjust the output format to modpost
>   kbuild: do not create *.prelink.o for Clang LTO or IBT
>   modpost: simplify the ->is_static initialization
>   modpost: use hlist for hash table implementation
>   kbuild: make built-in.a rule robust against too long argument error
>   kbuild: make *.mod rule robust against too long argument error


Only 03-06 were applied.

I will send v4 for the rest.
(I rewrote the static EXPORT checks).

>
>  arch/powerpc/Kconfig         |   1 -
>  arch/s390/Kconfig            |   1 -
>  arch/um/Kconfig              |   1 -
>  include/asm-generic/export.h |  22 +-
>  include/linux/export.h       |  30 +--
>  include/linux/symversion.h   |  13 +
>  init/Kconfig                 |   4 -
>  kernel/module.c              |  10 +-
>  scripts/Kbuild.include       |   4 +
>  scripts/Makefile.build       | 118 +++------
>  scripts/Makefile.lib         |   7 -
>  scripts/Makefile.modfinal    |   5 +-
>  scripts/Makefile.modpost     |   9 +-
>  scripts/genksyms/genksyms.c  |  18 +-
>  scripts/link-vmlinux.sh      |  46 ++--
>  scripts/mod/file2alias.c     |   2 -
>  scripts/mod/list.h           |  52 ++++
>  scripts/mod/modpost.c        | 449 ++++++++++++++++++++---------------
>  scripts/mod/modpost.h        |   2 +
>  19 files changed, 402 insertions(+), 392 deletions(-)
>  create mode 100644 include/linux/symversion.h
>
> --
> 2.32.0
>
> --
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-- 
Best Regards
Masahiro Yamada