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Date:   Fri, 22 May 2020 02:29:50 +0100
From:   Al Viro <viro@zeniv.linux.org.uk>
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     ira.weiny@intel.com, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
        Helge Deller <deller@gmx.de>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
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        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
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        Dave Hansen <dave.hansen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Chris Zankel <chris@zankel.net>,
        Max Filippov <jcmvbkbc@gmail.com>,
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        Christian Koenig <christian.koenig@amd.com>,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice
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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 ;-/