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

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Date:   Sat, 08 Dec 2018 09:54:39 +0100
From:   Richard Weinberger <richard@....at>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>
Subject: Re: [PATCH 1/2] um: remove -fno-unit-at-a-time workaround for pre-4.0 GCC

Am Samstag, 8. Dezember 2018, 07:35:47 CET schrieb Masahiro Yamada:
> x86 maintainers,
> 
> 
> Ping.

I thought you carry this via your kbuild tree.
That said, I can merge it also via the um tree.
x86 is of course also fine. :-)

> 
> 
> 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