linux-kernel - Re: [PATCH v4 00/13] mm: remove __ARCH_HAS_4LEVEL

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Date:   Tue, 5 Nov 2019 17:58:20 +0300
From:   Anatoly Pugachev <matorola@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        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>,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        linux-m68k@...ts.linux-m68k.org, linux-parisc@...r.kernel.org,
        linux-um@...ts.infradead.org,
        Sparc kernel list <sparclinux@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v4 00/13] mm: remove __ARCH_HAS_4LEVEL_HACK

On Tue, Nov 5, 2019 at 10:16 AM Mike Rapoport <rppt@...nel.org> wrote:
>
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> Hi,
>
> These patches convert several architectures to use page table folding and
> remove __ARCH_HAS_4LEVEL_HACK along with include/asm-generic/4level-fixup.h.
>
> For the nommu configurations the folding is already implemented by the
> generic code so the only change was to use the appropriate header file.
>
> As for the rest, the changes are mostly about mechanical replacement of
> pgd accessors with pud/pmd ones and the addition of higher levels to page
> table traversals.
>
> With Vineet's patches from "elide extraneous generated code for folded
> p4d/pud/pmd" series [1] there is a small shrink of the kernel size of about
> -0.01% for the defconfig builds.
>
> The set is boot-tested on UML, qemu-{alpha,sparc} and aranym.
>
> v4 changes:
> * m68k: fix sun3x_defconfig build and reorder ifdefs as per Geert's
>   suggestion


Mike,

tested your patch series on a debian sid/unstable sparc64 LDOM running
on a T5-2 sparc server - it boots for me.