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Date:   Fri, 22 May 2020 02:29:50 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     ira.weiny@...el.com, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice

On Thu, May 21, 2020 at 06:11:08PM -0700, Guenter Roeck wrote:

> Mainline, with:
> 
> qemu-system-sparc -M SS-4 -kernel arch/sparc/boot/zImage -no-reboot \
> 	-snapshot -drive file=rootfs.ext2,format=raw,if=scsi \
> 	-append "panic=-1 slub_debug=FZPUA root=/dev/sda console=ttyS0"
> 	-nographic -monitor none
> 
> The machine doesn't really matter, though.

It does, unfortunately - try that with SS-10 and watch what happens ;-/

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