linux-kernel - Re: [PATCH 0/5] Last bits for initial 5-level paging enabling

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Message-ID: <20170623144915.4d6esghvicnczuaj@black.fi.intel.com>
Date:   Fri, 23 Jun 2017 17:49:15 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Andy Lutomirski <luto@...capital.net>,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] Last bits for initial 5-level paging enabling

On Fri, Jun 23, 2017 at 11:06:01AM +0200, Ingo Molnar wrote:
> 
> * Kirill A. Shutemov <kirill.shutemov@...ux.intel.com> wrote:
> 
> > As Ingo requested I've split and updated last two patches for my previous
> > patchset.
> > 
> > Please review and consider applying.
> > 
> > Kirill A. Shutemov (5):
> >   x86: Enable 5-level paging support
> >   x86/mm: Rename tasksize_32bit/64bit to task_size_32bit/64bit
> >   x86/mpx: Do not allow MPX if we have mappings above 47-bit
> >   x86/mm: Prepare to expose larger address space to userspace
> >   x86/mm: Allow userspace have mapping above 47-bit
> 
> Ok, looks pretty neat now.
> 
> Can I apply them in this order cleanly, without breaking bisection:
> 
> >   x86/mm: Rename tasksize_32bit/64bit to task_size_32bit/64bit
> >   x86/mpx: Do not allow MPX if we have mappings above 47-bit
> >   x86/mm: Prepare to expose larger address space to userspace
> >   x86/mm: Allow userspace have mapping above 47-bit
> >   x86: Enable 5-level paging support
> 
> ?
> 
> I.e. I'd like to move the first patch last.
> 
> The reason is that we should first get all quirks and assumptions fixed, all 
> facilities implemented - and only then enable 5-level paging as a final step which 
> produces a well working kernel.
> 
> (This should also make it slightly easier to analyze any potential regressions in 
> earlier patches.)

Just checked bisectability with this order on allmodconfig -- works fine.

-- 
 Kirill A. Shutemov