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    SubjectRe: [BUG 5.14] arm64/mm: dma memory mapping fails (in some cases)
    On Sat, Sep 18, 2021 at 12:22:47AM +0300, Mike Rapoport wrote:
    > I did some digging and it seems that the most "generic" way to check if a
    > page is in RAM is page_is_ram(). It's not 100% bullet proof as it'll give
    > false negatives for architectures that do not register "System RAM", but
    > those are not using dma_map_resource() anyway and, apparently, never would.

    The downside of page_is_ram is that it looks really expensiv for
    something done at dma mapping time.

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