linux-kernel - Re: [PATCH v6 00/10] kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL

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Message-ID: <CAK7LNASGewXa8bHy1SZNzTi+V5aoHdV6OysY0z76SQNs92iB9Q@mail.gmail.com>
Date:   Wed, 10 Aug 2022 00:20:13 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     matoro <matoro_mailinglist_kernel@...oro.tk>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.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 v6 00/10] kbuild: yet another series of cleanups (modpost,
 LTO, MODULE_REL_CRCS, export.h)

On Tue, Aug 9, 2022 at 3:42 AM matoro
<matoro_mailinglist_kernel@...oro.tk> wrote:
>
> That patch doesn't apply to the v5.19 stable tag, so I just manually
> edited and it worked perfect!  Thank you!!
>
> Sorry I didn't mention that warning - I did see it, but it still showed
> up even on the old kernel, so I thought it was irrelevant.  Much
> appreciated!
>
> -------- Original Message --------
> Subject: Re: [PATCH v6 00/10] kbuild: yet another series of cleanups
> (modpost, LTO, MODULE_REL_CRCS, export.h)
> Date: 2022-08-08 13:36
>  From: Masahiro Yamada <masahiroy@...nel.org>
> To: matoro <matoro_mailinglist_kernel@...oro.tk>
>
> On Mon, Aug 8, 2022 at 10:27 PM matoro
> <matoro_mailinglist_kernel@...oro.tk> wrote:
> >
> > I have real hardware for all these arches in my collection.  I use it
> > for testing the latest kernel and toolchains on as many of the
> > less-popular arches as possible, exactly to find issues like this one
> > :)
> >
> > Specifically we support all of these in Gentoo.  To double-check this
> > wasn't a config issue, I asked another user who also runs sparc to try
> > building 5.19 with his config (not copying mine), and he observed the
> > same problem.  You can reach us in #gentoo-sparc on Libera.
> >
> > As for testing, I make all this hardware available on an as-needed
> > basis.  So if you can't or don't want to fiddle with qemu, just let me
> > know (email or IRC, same username on Libera), and I will get you direct
> > access to my hardware.  Thanks!!
>
>
> I found the root cause.
>
> When I build the sparc kernel, I see a warning
>
> WARNING: modpost: EXPORT symbol "_mcount" [vmlinux] version generation
> failed, symbol will not be versioned.
>
>
> Then, modpost missed to write out the entry.
>
> With the following patch, you will be able to load the module.
>
> I will send a patch with a proper commit log tomorrow. I need some sleep
> now.



I posted a patch:


https://patchwork.kernel.org/project/linux-kbuild/patch/20220809141117.641543-1-masahiroy@kernel.org/


If you want me to record your full name in Reported/Tested-by,
please let me know.





-- 
Best Regards
Masahiro Yamada