linux-kernel - Re: [PATCH 15/23] hugetlb/userfaultfd: Hook page faults for uffd write protection

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Message-ID: <902cbea7-0945-eeeb-a73b-52be652c5d1d@oracle.com>
Date:   Wed, 21 Apr 2021 15:02:36 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     "Kirill A . Shutemov" <kirill@...temov.name>,
        Jerome Glisse <jglisse@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Hugh Dickins <hughd@...gle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>
Subject: Re: [PATCH 15/23] hugetlb/userfaultfd: Hook page faults for uffd
 write protection

On 3/22/21 5:49 PM, Peter Xu wrote:
> Hook up hugetlbfs_fault() with the capability to handle userfaultfd-wp faults.
> 
> We do this slightly earlier than hugetlb_cow() so that we can avoid taking some
> extra locks that we definitely don't need.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  mm/hugetlb.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

That is pretty straight forward,

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