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

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Date:   Thu, 5 Dec 2019 14:23:14 -0500
From:   Rich Felker <dalias@...c.org>
To:     Rob Landley <rob@...dley.net>
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>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH v6 10/18] sh/tlb: Convert SH to generic mmu_gather

On Thu, Dec 05, 2019 at 01:24:02PM -0600, Rob Landley wrote:
> On 12/4/19 4:47 AM, Peter Zijlstra wrote:
> > On Tue, Dec 03, 2019 at 12:19:00PM +0100, Geert Uytterhoeven wrote:
> >> Hoi Peter,
> >>
> >> On Tue, Feb 19, 2019 at 11:35 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >>> Generic mmu_gather provides everything SH needs (range tracking and
> >>> cache coherency).
> >>>
> >>> Cc: Will Deacon <will.deacon@....com>
> >>> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> >>> Cc: Andrew Morton <akpm@...ux-foundation.org>
> >>> Cc: Nick Piggin <npiggin@...il.com>
> >>> Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
> >>> Cc: Rich Felker <dalias@...c.org>
> >>> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> >>
> >> 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 ?!?
> 
> No, but most people running this kind of hardware tend not to upgrade to current
> kernels on a regular basis.
> 
> The j-core guys tested the 5.3 release. I can't find an email about 5.4 so I
> dunno if that's been tested yet?

Being that this code is about mmu, does it affect nommu machines?
That's what we've got at present on the J-core side.

Rich