linux-kernel - Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE

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Message-ID: <CAK8P3a1P812avY8reSSguYB0jPzgjs+30dSJpKZCnWwzyLoSVQ@mail.gmail.com>
Date:   Mon, 25 Mar 2019 08:32:48 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Dave Hansen <dave@...1.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paul Burton <paul.burton@...s.com>,
        Ingo Molnar <mingo@...hat.com>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING

On Mon, Mar 25, 2019 at 7:11 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
> On Wed, Mar 20, 2019 at 10:34 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Wed, Mar 20, 2019 at 10:41 AM Arnd Bergmann <arnd@...db.de> wrote:
> > >
> > > I've added your patch to my randconfig test setup and will let you
> > > know if I see anything noticeable. I'm currently testing clang-arm32,
> > > clang-arm64 and gcc-x86.
> >
> > This is the only additional bug that has come up so far:
> >
> > `.exit.text' referenced in section `.alt.smp.init' of
> > drivers/char/ipmi/ipmi_msghandler.o: defined in discarded section
> > `exit.text' of drivers/char/ipmi/ipmi_msghandler.o
> >
> > diff --git a/arch/arm/kernel/atags.h b/arch/arm/kernel/atags.h
> > index 201100226301..84b12e33104d 100644
> > --- a/arch/arm/kernel/atags.h
> > +++ b/arch/arm/kernel/atags.h
> > @@ -5,7 +5,7 @@ void convert_to_tag_list(struct tag *tags);
> >  const struct machine_desc *setup_machine_tags(phys_addr_t __atags_pointer,
> >         unsigned int machine_nr);
> >  #else
> > -static inline const struct machine_desc *
> > +static __always_inline const struct machine_desc *
> >  setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr)
> >  {
> >         early_print("no ATAGS support: can't continue\n");
> >
>
>
> I do not know why to reproduce it,
> but is "__init __noreturn" more sensible than
> "__always_inline" here?

It's in a header file, so it has to be 'inline'. We could make it
static inline __init __noreturn, but I don't see an advantage over
__always_inline there.

        Arnd