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    SubjectRe: [PATCH 2/2] mm: set PG_dma_pinned on get_user_pages*()
    On Sun, Jun 17, 2018 at 01:10:04PM -0700, Dan Williams wrote:
    > I believe kernel behavior regression is a primary concern as now
    > fallocate() and truncate() can randomly fail where they didn't before.

    Fail or block forever due to actions of other unprivileged users.

    That is a complete no-go.

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