linux-kernel - Re: [PATCH 11/11] mm/thp: another PVMW_SYNC fix in page_vma_mapped

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Message-ID: <20210610094312.kzhhqyz4abe2yizg@box.shutemov.name>
Date:   Thu, 10 Jun 2021 12:43:12 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <shy828301@...il.com>,
        Wang Yugui <wangyugui@...-tech.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alistair Popple <apopple@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>, Zi Yan <ziy@...dia.com>,
        Peter Xu <peterx@...hat.com>, Will Deacon <will@...nel.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/11] mm/thp: another PVMW_SYNC fix in
 page_vma_mapped_walk()

On Wed, Jun 09, 2021 at 11:54:46PM -0700, Hugh Dickins wrote:
> Aha!  Shouldn't that quick scan over pte_none()s make sure that it holds
> ptlock in the PVMW_SYNC case?  That too might have been responsible for
> BUGs or WARNs in split_huge_page_to_list() or its unmap_page(), though
> I've never seen any.
> 
> Fixes: ace71a19cec5 ("mm: introduce page_vma_mapped_walk()")
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Cc: <stable@...r.kernel.org>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov