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    SubjectRe: dma_get_required_mask tidyups
    Any comments?  I have a a few things piled up that base on this, so
    some forward progress would be great.

    On Mon, Sep 10, 2018 at 08:13:29AM +0200, Christoph Hellwig wrote:
    > Hi all,
    > the dma_get_required_mask dma API implementation has always been a little
    > odd, in that we by default don't wire it up struct dma_map_ops, but
    > instead hard code a default implementation. powerpc and ia64 override
    > this default and either call a method or otherwise duplicate the default.
    > This series always enabled the method and just falls back to the previous
    > default implementation when it is not available, as well as fixing up
    > a few bits in the default implementations. This already allows removing
    > the ia64 override of the implementation, and will also allow to remove
    > the powerpc one together with a few additional cleanups in the powerpc
    > code, but those will be sent separately with other powerpc DMA API
    > patches. Last but not least the method will allow us to return a more
    > sensible value for typical iommu dma_ops eventually, but that is left
    > to another series as well.
    > _______________________________________________
    > iommu mailing list
    ---end quoted text---

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