linux-kernel - Re: LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge window

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Message-Id: <your-ad-here.call-01581357517-ext-6250@work.hours>
Date:   Mon, 10 Feb 2020 18:58:37 +0100
From:   Vasily Gorbik <gor@...ux.ibm.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     clang-built-linux <clang-built-linux@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: LKML: Vasily Gorbik: [GIT PULL] s390 patches for the 5.6 merge
 window

On Fri, Feb 07, 2020 at 10:22:20PM +0000, Nick Desaulniers wrote:
> + Vasily for real
> 
> On Fri, Feb 7, 2020, 11:02 PM Nick Desaulniers <ndesaulniers@...gle.com>
> wrote:
> 
> > https://lkml.org/lkml/2020/1/28/1141
> >
> > Yo, what's up with clang 10 support?
I believe s390 kernel had limited clang build support since about 5.2
(with jump labels and ftrace disabled), thanks to contributions from Arnd
Bergmann. With asm goto support in clang 9 and now everything for ftrace
in place in clang 10 s390 kernel should be in a good shape feature wise
(including KASAN). At this stage clang based tooling is the main interest.

> >
> > Can I boot this in qemu?
> >
qemu tcg seems to work fine for gcc built s390 kernels. While clang built
kernels run smoothly natively and with accel=kvm there is still something
to be fixed for accel=tcg (kernel fails to boot on both s390 and x86).