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    SubjectRe: [PATCH V9 13/15] mmc: block: Add CQE and blk-mq support
    [...]

    >> MQ code that doesn't perform and therefore we cannot switch seamlessly
    >> to MQ.
    >
    > I think that switching seamlessly to blk-mq in short/medium-term
    > is not possible (SCSI tried and failed to do so). The changes to
    > the old path are very complex and besides affecting performance
    > they also affect error recovery handling (which needs to be tested
    > properly before the switch).

    Agreed, and that's why I have queued up the new Kconfig option for
    enabling the blkmq path from MMC.

    Kind regards
    Uffe

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