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CONFIG_NVDIMM_PFN: PFN: Map persistent (device) memory

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The Linux kernel configuration item CONFIG_NVDIMM_PFN:

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Map persistent memory, i.e. advertise it to the memory management sub-system. By default persistent memory does not support direct I/O, RDMA, or any other usage that requires a 'struct page' to mediate an I/O request. This driver allocates and initializes the infrastructure needed to support those use cases.

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