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    SubjectRe: [PATCH 1/5 v2] dma-mapping: add generic dma_get_page_shift API
    Do we need a function here or can we just have a IOMMU_PAGE_SHIFT define
    with an #ifndef in common code?

    Also not all architectures use dma-mapping-common.h yet, so you either
    need to update all of those as well, or just add the #ifndef directly
    to linux/dma-mapping.h.


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