From mboxrd@z Thu Jan  1 00:00:00 1970
From: Guenter Roeck <linux@roeck-us.net>
Date: Thu, 05 Dec 2019 22:56:10 +0000
Subject: Re: [PATCH v6 10/18] sh/tlb: Convert SH to generic mmu_gather
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To: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Peter Zijlstra <peterz@infradead.org>, Geert Uytterhoeven <geert@linux-m68k.org>, Will Deacon <will.deacon@arm.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Andrew Morton <akpm@linux-foundation.org>, Nicholas Piggin <npiggin@gmail.com>, Linux-Arch <linux-arch@vger.kernel.org>, Linux MM <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Russell King <linux@armlinux.org.uk>, Heiko Carstens <heiko.carstens@de.ibm.com>, Rik van Riel <riel@surriel.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>, Linux-sh list <linux-sh@vger.kernel.org>

On Thu, Dec 05, 2019 at 08:30:17PM +0100, John Paul Adrian Glaubitz wrote:
> Hi!
> 
> On 12/4/19 11:47 AM, Peter Zijlstra wrote:
> >> I got remote access to an SH7722-based Migo-R again, which spews a long
> >> sequence of BUGs during userspace startup.  I've bisected this to commit
> >> c5b27a889da92f4a ("sh/tlb: Convert SH to generic mmu_gather").
> > 
> > Whoopsy.. also, is this really the first time anybody booted an SH
> > kernel in over a year ?!?
> 
> I have to admit, I have been very lazy with kernel updates. I have been
> planning to upgrade to a much more recent release on my boards for a while
> now, I have just been postponing it since the machines run very stable
> with the current kernel I am using.
> 

Hey, if you write a qemu emulation, I'll be happy to run it on a regular
basis :-)

Problem is really that the architecture doesn't get as much attention as
it needs. The backtrace pointed to by Rob has been seen for a long time,
but either there is no one with the knowledge to fix it, or they are all
busy with other stuff.

Guenter

> Adrian
> 
> -- 
>  .''`.  John Paul Adrian Glaubitz
> : :' :  Debian Developer - glaubitz@debian.org
> `. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
>   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913