RDMA/core: Fix umem iterator when PAGE_SIZE is greater then HCA pgsz
64k pages introduce the situation in this diagram when the HCA 4k page size is being used: +-------------------------------------------+ <--- 64k aligned VA | | | HCA 4k page | | | +-------------------------------------------+ | o | | | | o | | | | o | +-------------------------------------------+ | | | HCA 4k page | | | +-------------------------------------------+ <--- Live HCA page |OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO| <--- offset | | <--- VA ...
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