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    SubjectRe: [PATCH 1/4] mm: Trial do_wp_page() simplification
    On Fri, Aug 21, 2020 at 07:49:55PM -0400, Peter Xu wrote:
    > From: Linus Torvalds <torvalds@linux-foundation.org>
    >
    > How about we just make sure we're the only possible valid user fo the
    > page before we bother to reuse it?
    >
    > Simplify, simplify, simplify.
    >
    > And get rid of the nasty serialization on the page lock at the same time.
    >
    > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    > [peterx: add subject prefix]
    > Signed-off-by: Peter Xu <peterx@redhat.com>
    > mm/memory.c | 59 +++++++++++++++--------------------------------------
    > 1 file changed, 17 insertions(+), 42 deletions(-)

    I don't have a detailed explanation right now, but this patch appears
    to be causing a regression where RDMA subsystem tests fail. Tests
    return to normal when this patch is reverted.

    It kind of looks like the process is not seeing DMA'd data to a
    pin_user_pages()?

    Thanks,
    Jason

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