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SubjectRe: [PATCH 4.19 66/81] MIPS: Disable Loongson MMI instructions for kernel build
On Mon, Sep 07, 2020 at 05:35:26AM +0200, Philippe Mathieu-Daudé wrote:
> On Thu, Sep 3, 2020 at 11:28 AM Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> >
> > On Wed, Aug 26, 2020 at 02:06:28PM -0700, Guenter Roeck wrote:
> > > Hi,
> > >
> > > On Wed, Oct 16, 2019 at 02:51:17PM -0700, Greg Kroah-Hartman wrote:
> > > > From: Paul Burton <paul.burton@mips.com>
> > > >
> > > > commit 2f2b4fd674cadd8c6b40eb629e140a14db4068fd upstream.
> > > >
> > > > GCC 9.x automatically enables support for Loongson MMI instructions when
> > > > using some -march= flags, and then errors out when -msoft-float is
> > > > specified with:
> > > >
> > > > cc1: error: ‘-mloongson-mmi’ must be used with ‘-mhard-float’
> > > >
> > > > The kernel shouldn't be using these MMI instructions anyway, just as it
> > > > doesn't use floating point instructions. Explicitly disable them in
> > > > order to fix the build with GCC 9.x.
> > > >
> > >
> > > I still see this problem when trying to compile fuloong2e_defconfig with
> > > gcc 9.x or later. Reason seems to be that the patch was applied to
> > > arch/mips/loongson64/Platform, but fuloong2e_defconfig uses
> > > arch/mips/loongson2ef/Platform.
> > >
> > > Am I missing something ?
> >
> > I don't know, sorry, that would be something that Paul understands.
> >
> > Paul?
>
> Cc'ing Thomas who now maintains this.

I've queued a patch to fix this in mips-fixes.

Thomas.

--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]

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