linux-kernel - Re: [PATCH 1/2] um: remove -fno-unit-at-a-time workaround for pre-4.0 GCC

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Message-ID: <CAK7LNAQjyWgpnu=qv-55gTL2DWpE93muu3Ksey8wFnWtLOzpbA@mail.gmail.com>
Date:   Sat, 8 Dec 2018 15:35:47 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Richard Weinberger <richard@....at>
Subject: Re: [PATCH 1/2] um: remove -fno-unit-at-a-time workaround for pre-4.0 GCC

x86 maintainers,


Ping.



On Tue, Nov 13, 2018 at 6:48 PM Richard Weinberger <richard@....at> wrote:
>
> Am Montag, 12. November 2018, 03:35:19 CET schrieb Masahiro Yamada:
> > Commit cafa0010cd51 ("Raise the minimum required gcc version to 4.6")
> > bumped the minimum GCC version to 4.6 for all architectures.
> >
> > '$(call cc-option,-fno-unit-at-a-time)' is now dead code since
> > '$(cc-version) -lt 0400' is always false.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > ---
> >
> >  arch/x86/Makefile.um | 8 ++------
> >  1 file changed, 2 insertions(+), 6 deletions(-)
> >
> > diff --git a/arch/x86/Makefile.um b/arch/x86/Makefile.um
> > index 91085a0..577976b 100644
> > --- a/arch/x86/Makefile.um
> > +++ b/arch/x86/Makefile.um
> > @@ -26,12 +26,8 @@ cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)
> >  # an unresolved reference.
> >  cflags-y += -ffreestanding
> >
> > -# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
> > -# a lot more stack due to the lack of sharing of stacklots.  Also, gcc
> > -# 4.3.0 needs -funit-at-a-time for extern inline functions.
> > -KBUILD_CFLAGS += $(shell if [ $(cc-version) -lt 0400 ] ; then \
> > -                     echo $(call cc-option,-fno-unit-at-a-time); \
> > -                     else echo $(call cc-option,-funit-at-a-time); fi ;)
> > +# gcc 4.3.0 needs -funit-at-a-time for extern inline functions.
> > +KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
>
> Acked-by: Richard Weinberger <richard@....at>
>
> Thanks,
> //richard
>
>
>


-- 
Best Regards
Masahiro Yamada