linux-kernel - Re: [PATCH 06/12] microblaze: use pgtable-nopmd instead of 4level-fixup

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Date:   Fri, 25 Oct 2019 23:33:19 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Michal Simek <monstr@...str.eu>
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>,
        Richard Weinberger <richard@....at>,
        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@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org,
        sparclinux@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH 06/12] microblaze: use pgtable-nopmd instead of
 4level-fixup

On Fri, Oct 25, 2019 at 10:24:30AM +0200, Michal Simek wrote:
> Hi Mike,
> 
> On 23. 10. 19 11:28, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> > 
> > microblaze has only two-level page tables and can use pgtable-nopmd and
> > folding of the upper layers.
> > 
> > Replace usage of include/asm-generic/4level-fixup.h and explicit definition
> > of __PAGETABLE_PMD_FOLDED in microblaze with
> > include/asm-generic/pgtable-nopmd.h and adjust page table manipulation
> > macros and functions accordingly.
> > 
> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> > ---
> >  arch/microblaze/include/asm/page.h    |  3 ---
> >  arch/microblaze/include/asm/pgalloc.h | 16 ----------------
> >  arch/microblaze/include/asm/pgtable.h | 32 ++------------------------------
> >  arch/microblaze/kernel/signal.c       | 10 +++++++---
> >  arch/microblaze/mm/init.c             |  7 +++++--
> >  arch/microblaze/mm/pgtable.c          | 13 +++++++++++--
> >  6 files changed, 25 insertions(+), 56 deletions(-)
> 
> I have take a look at this and when this is applied on the top of
> 5.4-rc2 there is not a problem.
> But as was reported by 0-day there is compilation issue on the top of
> mmotm/master tree and I am able to replicate it.
> It means there are other changes in Andrew's tree which are causing it.

0day is still using an old tree for mmotm:

> url:    https://github.com/0day-ci/linux/commits/Mike-Rapoport/mm-remove-__ARCH_HAS_4LEVEL_HACK/20191025-063009
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: microblaze-mmu_defconfig (attached as .config)

A while ago Johannes moved the mmotm to github and the last commit in
git.cmpxchg.org/linux-mmotm.git was in the end of August.

[1] https://lore.kernel.org/linux-mm/20190916134327.GC29985@cmpxchg.org
 
> Thanks,
> Michal
> 
> -- 
> Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
> w: www.monstr.eu p: +42-0-721842854
> Maintainer of Linux kernel - Xilinx Microblaze
> Maintainer of Linux kernel - Xilinx Zynq ARM and ZynqMP ARM64 SoCs
> U-Boot custodian - Xilinx Microblaze/Zynq/ZynqMP/Versal SoCs
> 

-- 
Sincerely yours,
Mike.