linux-kernel - Re: [PATCH 05/10] mm/hugetlb: Make userfaultfd_huge_must

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Message-ID: <Y45vab2k+S4DN1vd@monkey>
Date:   Mon, 5 Dec 2022 14:23:37 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        James Houghton <jthoughton@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Muchun Song <songmuchun@...edance.com>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 05/10] mm/hugetlb: Make userfaultfd_huge_must_wait() safe
 to pmd unshare

On 11/29/22 14:35, Peter Xu wrote:
> We can take the hugetlb walker lock, here taking vma lock directly.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  fs/userfaultfd.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)

Looks good.

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