linux-kernel - Re: [PATCH] MIPS: fw: arc: add __weak to prom_meminit and prom_free_prom

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Message-ID: <CAK7LNATKLcCPYxQZNbrS-jMPg+_BETU0dGv0qYvLqUkJ2fMt5w@mail.gmail.com>
Date:   Mon, 6 Apr 2020 10:45:03 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org,
        Fāng-ruì Sòng <maskray@...gle.com>
Subject: Re: [PATCH] MIPS: fw: arc: add __weak to prom_meminit and prom_free_prom_memory

On Mon, Apr 6, 2020 at 2:16 AM Maciej W. Rozycki <macro@...ux-mips.org> wrote:
>
> On Mon, 6 Apr 2020, Masahiro Yamada wrote:
>
> > As far as I understood, prom_meminit() in arch/mips/fw/arc/memory.c
> > is overridden by the one in arch/mips/sgi-ip32/ip32-memory.c if
> > CONFIG_SGI_IP32 is enabled.
> >
> > The use of EXPORT_SYMBOL in static libraries potentially causes a
> > problem for the llvm linker [1]. So, I want to forcibly link lib-y
> > objects to vmlinux when CONFIG_MODULES=y.
>
>  It looks to me like a bug in the linker in the handling of the EXTERN
> command.  Why not fix the linker instead?
>
>   Maciej


I am not sure if this is a bug.
Anyway, they decided to not change ld.lld


MIPS code is so confusing.
There are multiple definitions,
and lib.a is (ab)used to hide them.

I fixed another one for MIPS before, and
0-day bot reported this recently.


There are lots of prom_meminit() definitions
in arch/mips/.

Making the intention clearer is a good thing, IMHO.


-- 
Best Regards
Masahiro Yamada