linux-kernel - Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag

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Date:   Tue, 12 Jan 2021 21:46:15 +0000
From:   Will Deacon <will@...nel.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Jan Kara <jack@...e.cz>, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vinayak Menon <vinmenon@...eaurora.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on
 arm64 with hardware access flag

On Mon, Jan 11, 2021 at 01:03:29PM -0800, Hugh Dickins wrote:
> On Mon, 11 Jan 2021, Will Deacon wrote:
> > On Fri, Jan 08, 2021 at 11:34:08AM -0800, Linus Torvalds wrote:
> > > On Fri, Jan 8, 2021 at 9:15 AM Will Deacon <will@...nel.org> wrote:
> > > >
> > > > The big difference in this version is that I have reworked it based on
> > > > Kirill's patch which he posted as a follow-up to the original. However,
> > > > I can't tell where we've landed on that -- Linus seemed to like it, but
> > > > Hugh was less enthusiastic.
> > > 
> > > Yeah, I like it, but I have to admit that it had a disturbingly high
> > > number of small details wrong for several versions. I hope you picked
> > > up the final version of the code.
> > 
> > I picked the version from here:
> > 
> >   https://lore.kernel.org/r/20201229132819.najtavneutnf7ajp@box
> > 
> > and actually, I just noticed that willy spotted a typo in a comment, so
> > I'll fix that locally as well as adding the above to a 'Link:' tag for
> > reference.
> > 
> > > At the same time, I do think that the "disturbingly high number of
> > > issues" was primarily exactly _because_ the old code was so
> > > incomprehensible, and I think the end result is much cleaner, so I
> > > still like it.
> 
> Just to report that I gave this v2 set a spin on a few (x86_64 and i386)
> machines, and found nothing objectionable this time around.

Thanks, Hugh.

> And the things that I'm unenthusiastic about are exactly those details
> that you and Kirill and Linus find unsatisfactory, but awkward to
> eliminate: expect no new insights from me!

Well, I'll keep you on CC for v3 -- just in case!

Will