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Date:   Sat, 26 Dec 2020 16:45:55 -0800 (PST)
From:   Hugh Dickins <>
To:     "Kirill A. Shutemov" <>
cc:     Linus Torvalds <>,
        Hugh Dickins <>,
        Matthew Wilcox <>,
        "Kirill A. Shutemov" <>,
        Will Deacon <>,
        Linux Kernel Mailing List <>,
        Linux-MM <>,
        Linux ARM <>,
        Catalin Marinas <>,
        Jan Kara <>, Minchan Kim <>,
        Andrew Morton <>,
        Vinayak Menon <>,
        Android Kernel Team <>
Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries
 when prefaulting

On Sun, 27 Dec 2020, Kirill A. Shutemov wrote:
> Here's the fixup I have so far. It doesn't blow up immediately, but please
> take a closer look. Who knows what stupid mistake I did this time. :/

It's been running fine on x86_64 for a couple of hours (but of course
my testing is deficient, in not detecting the case Linus spotted).

But I just thought I'd try it on i386 (hadn't tried previous versions)
and this has a new disappointment: crashes when booting, in the "check
if the page fault is solved" in do_fault_around().  I imagine a highmem
issue with kmap of the pte address, but I'm reporting now before looking
into it further (but verified that current linux.git i386 boots up fine).

Maybe easily fixed: but does suggest this needs exposure in linux-next.


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