linux-kernel - Re: [PATCH 3/4] mm/rmap: fix new bug: premature return from page_mlock

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Date:   Wed, 7 Jul 2021 13:22:27 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alistair Popple <apopple@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Christoph Hellwig <hch@....de>, Yang Shi <shy828301@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 3/4] mm/rmap: fix new bug: premature return from page_mlock_one()

On Wed, Jul 7, 2021 at 1:11 PM Hugh Dickins <hughd@...gle.com> wrote:
>
> In the unlikely race case that page_mlock_one() finds VM_LOCKED has been
> cleared by the time it got page table lock, page_vma_mapped_walk_done()
> must be called before returning, either explicitly, or by a final call
> to page_vma_mapped_walk() - otherwise the page table remains locked.
>
> Fixes: cd62734ca60d ("mm/rmap: split try_to_munlock from try_to_unmap")
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>