linux-kernel - Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse

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Message-ID: <YxdoQR30GXfTH/6K@nvidia.com>
Date:   Tue, 6 Sep 2022 12:33:21 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     John Hubbard <jhubbard@...dia.com>, Yang Shi <shy828301@...il.com>,
        peterx@...hat.com, kirill.shutemov@...ux.intel.com,
        hughd@...gle.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: gup: fix the fast GUP race against THP collapse

On Tue, Sep 06, 2022 at 04:44:20PM +0200, David Hildenbrand wrote:

> ... I do wonder if we want to reuse ptep_get_lockless() instead of the
> READ_ONCE(). CONFIG_GUP_GET_PTE_LOW_HIGH is confusing.

Yes, that is a whole other topic, and you may be quite right on that.

Jason