linux-kernel - Re: [RESEND PATCH v1 3/5] mm: Fix failure to unmap pte on highmem systems

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Message-ID: <2E10F2A8-D954-451D-9CA7-042E55394FF7@nvidia.com>
Date:   Thu, 11 May 2023 11:01:33 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Ryan Roberts <ryan.roberts@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        SeongJae Park <sj@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, damon@...ts.linux.dev
Subject: Re: [RESEND PATCH v1 3/5] mm: Fix failure to unmap pte on highmem
 systems

On 11 May 2023, at 9:21, Ryan Roberts wrote:

> The loser of a race to service a pte for a device private entry in the
> swap path previously unlocked the ptl, but failed to unmap the pte. This
> only affects highmem systems since unmapping a pte is a noop on
> non-highmem systems.
>
> Fixes: 16ce101db85d ("mm/memory.c: fix race when faulting a device private page")
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>  mm/memory.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
LGTM. Reviewed-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan, Zi

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