linux-kernel - Re: [PATCH 0/6] x86: 5-level paging enabling for v4.12, Part 1

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Date:   Tue, 14 Mar 2017 11:24:09 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        Michal Hocko <mhocko@...e.com>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] x86: 5-level paging enabling for v4.12, Part 1

On Tue, Mar 14, 2017 at 08:47:29AM +0100, Ingo Molnar wrote:
> 
> * Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:
> 
> > Here's the first bunch of patches of 5-level patchset. Let's see if I'm on
> > right track addressing Ingo's feedback. :)
> > 
> > These patches prepare x86 code to be switched from <asm-generic/5level-fixup>
> > to <asm-generic/pgtable-nop4d.h>. It's a stepping stone for adding 5-level
> > paging support.
> > 
> > Please review and consider applying.
> > 
> > Kirill A. Shutemov (6):
> >   x86/mm: Extend headers with basic definitions to support 5-level
> >     paging
> >   x86/mm: Convert trivial cases of page table walk to 5-level paging
> >   x86/gup: Add 5-level paging support
> >   x86/ident_map: Add 5-level paging support
> >   x86/vmalloc: Add 5-level paging support
> >   x86/power: Add 5-level paging support
> > 
> >  arch/x86/include/asm/pgtable-2level_types.h |  1 +
> >  arch/x86/include/asm/pgtable-3level_types.h |  1 +
> >  arch/x86/include/asm/pgtable.h              | 26 +++++++++---
> >  arch/x86/include/asm/pgtable_64_types.h     |  1 +
> >  arch/x86/include/asm/pgtable_types.h        | 30 ++++++++++++-
> >  arch/x86/kernel/tboot.c                     |  6 ++-
> >  arch/x86/kernel/vm86_32.c                   |  6 ++-
> >  arch/x86/mm/fault.c                         | 66 +++++++++++++++++++++++++----
> >  arch/x86/mm/gup.c                           | 33 ++++++++++++---
> >  arch/x86/mm/ident_map.c                     | 51 +++++++++++++++++++---
> >  arch/x86/mm/init_32.c                       | 22 +++++++---
> >  arch/x86/mm/ioremap.c                       |  3 +-
> >  arch/x86/mm/pgtable.c                       |  4 +-
> >  arch/x86/mm/pgtable_32.c                    |  8 +++-
> >  arch/x86/platform/efi/efi_64.c              | 13 ++++--
> >  arch/x86/power/hibernate_32.c               |  7 ++-
> >  arch/x86/power/hibernate_64.c               | 50 ++++++++++++++++------
> >  17 files changed, 269 insertions(+), 59 deletions(-)
> 
> Much better!
> 
> I've applied them, with (very) minor readability edits here and there, and will 
> push them out into tip:x86/mm and tip:master after some testing - you can use that 
> as a base for the remaining submissions.

Thanks.

> I've also applied the GUP patch, with the assumption that you'll address Linus's 
> request to switch x86 over to the generic version.

Okay, I'll do this.

I just want to make priorities clear here: is it okay to finish with the
rest of 5-level paging patches first before moving to GUP_fast switch?

-- 
 Kirill A. Shutemov