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 13:55:22 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Will Deacon <will@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        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>,
        Hugh Dickins <hughd@...gle.com>,
        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 Tue, Jan 12, 2021 at 1:48 PM Will Deacon <will@...nel.org> wrote:
>
> > And then if somebody actually needs to pass in "modified fault state"
> > (ie that whole "I'm doing fault-around, so I'll use multiple
> > addresses") they'd never modify the address in the fault info, they'd
> > just pass the address as an explicit argument (like most cases already
> > do - the "change addr or flags in vmf" is actually already _fairly_
> > rare).
>
> Alright then, I'll take another crack at this for v3 and see how far I
> get.

But please do keep it as a separate patch, and if it turns out to be
ugly for whatever reason, treat it as just a "maybe that would help"
suggestion rather than anything stronger..

           Linus