linux-kernel - Re: [PATCH 20/23] hugetlb/userfaultfd: Allow wr-protect none ptes

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Message-ID: <8e32ade9-c8ef-3d35-34b9-1e4acbc14f00@oracle.com>
Date:   Thu, 22 Apr 2021 17:08:34 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peter Xu <peterx@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH 20/23] hugetlb/userfaultfd: Allow wr-protect none ptes

On 3/22/21 5:50 PM, Peter Xu wrote:
> Teach hugetlbfs code to wr-protect none ptes just in case the page cache
> existed for that pte.  Meanwhile we also need to be able to recognize a uffd-wp
> marker pte and remove it for uffd_wp_resolve.
> 
> Since at it, introduce a variable "psize" to replace all references to the huge
> page size fetcher.

Introducing psize may have caused most changes. :)  I like it.

> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  mm/hugetlb.c | 29 +++++++++++++++++++++++++----
>  1 file changed, 25 insertions(+), 4 deletions(-)

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz