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Add VM_MIXEDMAP support to follow_pfn
VM_MIXEDMAPs which are created by mmaping files in DAX capable filesystem do have valid PFNs. However, there is no obvious way to get the PFN from a VMA because follow_pfn is limitted to VMAs with the VM_IO or VM_PFNMAP flags. If we add VM_MIXEDMAP to this check we can get the PFN in the same way we do for VM_PFNMAPs.
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