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

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Date:   Fri, 6 Dec 2019 06:03:50 -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 12/6/19 5:38 AM, John Paul Adrian Glaubitz wrote:
> Hi!
> 
> On 12/5/19 11:56 PM, Guenter Roeck wrote:
>>> 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 :-)
> 
> There is working SH emulation in QEMU. I have been wanting to prepare a
> current Debian/sh4 test image for that purpose for a while now.
> 

I do run this emulation in my tests. It does not support the affected CPU,
unfortunately.

Guenter

> For the time being, you can use the image by Aurelien Jarno:
> 
>> https://people.debian.org/~aurel32/qemu/sh4/
> 
>> 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.
> 
> I fully agree. I'm mostly busy with the userland stuff, i.e. Debian packages
> for sh4 and not so much with the kernel.
> 
> Adrian
>