linux-kernel - Re: [PATCH v4 05/13] m68k: mm: use pgtable-nopXd instead of 4level-fixup

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Date:   Sun, 10 Nov 2019 10:41:26 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Greentime Hu <green.hu@...il.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Helge Deller <deller@....de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Jeff Dike <jdike@...toit.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mark Salter <msalter@...hat.com>,
        Matt Turner <mattst88@...il.com>,
        Michal Simek <monstr@...str.eu>, Peter Rosin <peda@...ntia.se>,
        Richard Weinberger <richard@....at>,
        Rolf Eike Beer <eike-kernel@...tec.de>,
        Russell King <linux@...linux.org.uk>,
        Sam Creasey <sammy@...my.net>,
        Vincent Chen <deanbo422@...il.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-c6x-dev@...ux-c6x.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux/m68k <linux-m68k@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linux-um@...ts.infradead.org,
        sparclinux <sparclinux@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v4 05/13] m68k: mm: use pgtable-nopXd instead of
 4level-fixup

Hi Andrew,

On Sat, Nov 09, 2019 at 03:26:29PM +0100, Geert Uytterhoeven wrote:
> Hi Andrew,
> 
> On Fri, Nov 8, 2019 at 8:39 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
> > On Tue,  5 Nov 2019 09:15:27 +0200 Mike Rapoport <rppt@...nel.org> wrote:
> > > m68k has two or three levels of page tables and can use appropriate
> > > pgtable-nopXd and folding of the upper layers.
> > >
> > > Replace usage of include/asm-generic/4level-fixup.h and explicit
> > > definitions of __PAGETABLE_PxD_FOLDED in m68k with
> > > include/asm-generic/pgtable-nopmd.h for two-level configurations and with
> > > include/asm-generic/pgtable-nopud.h for three-lelve configurations and
> > > adjust page table manipulation macros and functions accordingly.
> >
> > This one was messed up by linux-next changes in arch/m68k/mm/kmap.c.
> > Can you please take a look?

Can you please elaborate what was the problem?

The patch applies cleanly to v5.4-rc6-mmots-2019-11-08-16-23 (from
github.com/hnaz/linux-mm) and all the page table traversals in
arch/m68k/mm/kmap.c look Ok.

I've build atari_defconfig and it boots fine on aranym.
 
> You mean due to the rename and move of __iounmap() to __free_io_area()
> in commit aa3a1664285d0bec ("m68k: rename __iounmap and mark it static")?
> 
> Commit 42d6c83d6180f800 ("m68k: mm: use pgtable-nopXd instead of
> 4level-fixup") in next-20191108 looks good to me.
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

-- 
Sincerely yours,
Mike.