linux-kernel - Re: Surprising code generated for vdso_read

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Message-ID: <CAK8P3a11wX1zJ+TAacDTkYsrzvfdVmNrcB6OC23aFvCxF57opQ@mail.gmail.com>
Date:   Sun, 16 Feb 2020 19:10:55 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Segher Boessenkool <segher@...nel.crashing.org>
Cc:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andy Lutomirski <luto@...nel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>
Subject: Re: Surprising code generated for vdso_read_begin()

On Sat, Jan 11, 2020 at 12:33 PM Segher Boessenkool
<segher@...nel.crashing.org> wrote:
>
> On Fri, Jan 10, 2020 at 07:45:44AM +0100, Christophe Leroy wrote:
> > Le 09/01/2020 à 21:07, Segher Boessenkool a écrit :
> > >It looks like the compiler did loop peeling.  What GCC version is this?
> > >Please try current trunk (to become GCC 10), or at least GCC 9?
> >
> > It is with GCC 5.5
> >
> > https://mirrors.edge.kernel.org/pub/tools/crosstool/ doesn't have more
> > recent than 8.1
>
> Arnd, can you update the tools?  We are at 8.3 and 9.2 now :-)  Or is
> this hard and/or painful to do?

To follow up on this older thread, I have now uploaded 6.5, 7.5, 8.3 and 9.2
binaries, as well as a recent 10.0 snapshot.

I hope these work, let me know if there are problems.

       Arnd