linux-kernel - Re: [PATCH v5 00/12] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL

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Date:   Fri, 13 May 2022 20:18:50 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-modules <linux-modules@...r.kernel.org>,
        clang-built-linux <llvm@...ts.linux.dev>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: Re: [PATCH v5 00/12] kbuild: yet another series of cleanups (modpost,
 LTO, MODULE_REL_CRCS, export.h)

On Thu, May 12, 2022 at 5:04 AM Nathan Chancellor <nathan@...nel.org> wrote:
>
> Hi Masahiro,
>
> On Thu, May 12, 2022 at 01:45:02AM +0900, Masahiro Yamada wrote:
> >
> > This is the third batch of cleanups in this development cycle.
> >
> > Major changes in v5:
> >  - Fix build errors
> >  - More cleanups
> >
> > Major changes in v4:
> >  - Move static EXPORT_SYMBOL check to a script
> >  - Some refactoring
> >
> > 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 (12):
> >   modpost: split the section mismatch checks into section-check.c
> >   modpost: add sym_find_with_module() helper
> >   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
> >   kbuild: check static EXPORT_SYMBOL* by script instead of modpost
> >   kbuild: make built-in.a rule robust against too long argument error
> >   kbuild: make *.mod rule robust against too long argument error
> >   kbuild: add cmd_and_savecmd macro
> >   kbuild: rebuild multi-object modules when objtool is updated
>
> I applied this series to your latest kbuild branch, built an Arch
> Linux x86_64 config and Fedora aarch64 config with
> CONFIG_LTO_CLANG_FULL=y then CONFIG_LTO_CLANG_THIN=y, and boot tested
> each kernel in QEMU with a full userspace. I did not notice any new
> warnings/errors and everything appears to work fine.
>
> Tested-by: Nathan Chancellor <nathan@...nel.org>
>
> Cheers,
> Nathan


Thanks for your testing.

I ended up with v6 due to a build issue
of CONFIG_TRIM_UNUSED_KSYMS,
but this patch set is getting in good shape.

Thanks.


-- 
Best Regards
Masahiro Yamada