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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Fri, 26 Feb 2021 01:17:58 +0900
Message-ID: <CAK7LNASs11LbPWRnbMG=1nvgWLrqrmWynEYLd9HjAwx5i+WNtA@mail.gmail.com>
Subject: Re: [GIT PULL] Modules updates for v5.12
To:     Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc:     Jessica Yu <jeyu@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        =?UTF-8?Q?=EF=BF=BCMiroslav_Benes?= <mbenes@suse.cz>,
        Emil Velikov <emil.l.velikov@gmail.com>
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On Fri, Feb 26, 2021 at 12:49 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Thu, Feb 25, 2021 at 4:36 AM Rasmus Villemoes
> <rasmus.villemoes@prevas.dk> wrote:
> >
> > On 24/02/2021 15.40, Masahiro Yamada wrote:
> > > On Wed, Feb 24, 2021 at 5:33 PM Jessica Yu <jeyu@kernel.org> wrote:
> > >>
> > >> +++ Linus Torvalds [23/02/21 12:03 -0800]:
> > >>> On Tue, Feb 23, 2021 at 12:01 PM Christoph Hellwig <hch@lst.de> wrote:
> > >>>>
> > >>>> Does your build now enable TRIM_UNUSED_KSYMS but previously didn't by
> > >>>> chance?
> > >>>
> > >>> Crossed emails.
> > >>>
> > >>> This is plain "make allmodconfig", so yes, now it will enable TRIM_UNUSED_KSYMS.
> > >>>
> > >>> This is unacceptably slow. If that symbol trimming takes 30% of the
> > >>> whole kernel build time, it needs to be fixed or removed.
> > >>
> > >> [ Adding Masahiro to CC ]
> > >>
> > >> It looks like CONFIG_TRIM_UNUSED_KSYMS had been hiding behind
> > >> CONFIG_UNUSED_SYMBOLS all this time, and once the EXPORT_UNUSED_SYMBOL
> > >> stuff was removed, it exposed that option to be selected by
> > >> allyesconfig. That option had previously caused build issues on
> > >> powerpc on linux-next, so I had temporarily marked that as BROKEN on
> > >> powerpc until Masahiro's fix landed in linux-next. I was not aware of
> > >> the additional build slowdown issue :/ In any case, Christoph's
> > >> suggestion to invert the option sounds reasonable, since the mips
> > >> defconfig selects it, it does not seem totally unused.
>
>
> Good insight.
> Actually, I came up with the same idea last night, and had started
> the implementation background.
> I needed sleep before completing the patch set, but
> now it is working as far as I tested.
>
> BTW,
> KEEP(*(SORT(___ksymtab+foo ___ksymtab+bar ___ksymtab+baz))
> is a syntax error.
>
> KEEP(*(__ksymtab+foo))
> KEEP(*(__ksymtab+bar))
> KEEP(*(__ksymtab+baz))
>
> works.
>
>

Sorry, I missed to CC you.

This patch set.

https://lore.kernel.org/patchwork/project/lkml/list/?series=486545


-- 
Best Regards
Masahiro Yamada