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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue, 12 Jan 2021 13:55:22 -0800
Message-ID: <CAHk-=wi4tws9Haoccs+_D841tAh+5TdvdZyX+0T6gOKV_Fd3SA@mail.gmail.com>
Subject: Re: [PATCH v2 0/3] Create 'old' ptes for faultaround mappings on
 arm64 with hardware access flag
To:     Will Deacon <will@kernel.org>
Cc:     "Kirill A. Shutemov" <kirill@shutemov.name>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
        Vinayak Menon <vinmenon@codeaurora.org>,
        Hugh Dickins <hughd@google.com>,
        Android Kernel Team <kernel-team@android.com>
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On Tue, Jan 12, 2021 at 1:48 PM Will Deacon <will@kernel.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