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Date:   Thu, 7 Jan 2021 16:54:13 -0500
From:   Andrea Arcangeli <>
To:     Linus Torvalds <>
Cc:     Jason Gunthorpe <>, Linux-MM <>,
        Linux Kernel Mailing List <>,
        Yu Zhao <>, Andy Lutomirski <>,
        Peter Xu <>,
        Pavel Emelyanov <>,
        Mike Kravetz <>,
        Mike Rapoport <>,
        Minchan Kim <>,
        Will Deacon <>,
        Peter Zijlstra <>,
        Hugh Dickins <>,
        "Kirill A. Shutemov" <>,
        Matthew Wilcox <>,
        Oleg Nesterov <>, Jann Horn <>,
        Kees Cook <>,
        John Hubbard <>,
        Leon Romanovsky <>, Jan Kara <>,
        Kirill Tkhai <>
Subject: Re: [PATCH 0/2] page_count can't be used to decide when wp_page_copy

On Thu, Jan 07, 2021 at 12:32:09PM -0800, Linus Torvalds wrote:
> I think Andrea is blinded by his own love for UFFDIO: when I do a
> debian codesearch for UFFDIO_WRITEPROTECT, all it finds is the kernel
> and strace (and the qemu copies of the kernel headers).

For the record, I feel obliged to reiterate I'm thinking purely in
clear_refs terms here.

It'd be great if we can only focus on clear_refs_write and nothing

Like I said earlier, whatever way clear_refs/softdirty copes with
do_wp_page, uffd-wp can do the identical thing so, uffd-wp is
effectively irrelevant in this whole discussion. Clear-refs/softdirty
predates uffd-wp by several years too.


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