linux-kernel - Re: [PATCH v6 10/18] sh/tlb: Convert SH to generic mmu

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Message-ID: <20191205225610.GB2532@roeck-us.net>
Date:   Thu, 5 Dec 2019 14:56:10 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Will Deacon <will.deacon@....com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Rik van Riel <riel@...riel.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Linux-sh list <linux-sh@...r.kernel.org>
Subject: Re: [PATCH v6 10/18] sh/tlb: Convert SH to generic mmu_gather

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@...ian.org
> `. `'   Freie Universitaet Berlin - glaubitz@...sik.fu-berlin.de
>   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913