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# SPDX-License-Identifier: GPL-2.0-only config DAX_DRIVER select DAX bool menuconfig DAX tristate "DAX: direct access to differentiated memory" select SRCU default m if NVDIMM_DAX if DAX config DEV_DAX tristate "Device DAX: direct access mapping device" depends on TRANSPARENT_HUGEPAGE help Support raw access to differentiated (persistence, bandwidth, latency...) memory via an mmap(2) capable character device. Platform firmware or a device driver may identify a platform memory resource that is differentiated from the baseline memory pool. Mappings of a /dev/daxX.Y device impose restrictions that make the mapping behavior deterministic. config DEV_DAX_PMEM tristate "PMEM DAX: direct access to persistent memory" depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX default DEV_DAX help Support raw access to persistent memory. Note that this driver consumes memory ranges allocated and exported by the libnvdimm sub-system. Say M if unsure config DEV_DAX_KMEM tristate "KMEM DAX: volatile-use of persistent memory" default DEV_DAX depends on DEV_DAX depends on MEMORY_HOTPLUG # for add_memory() and friends help Support access to persistent memory as if it were RAM. This allows easier use of persistent memory by unmodified applications. To use this feature, a DAX device must be unbound from the device_dax driver (PMEM DAX) and bound to this kmem driver on each boot. Say N if unsure. config DEV_DAX_PMEM_COMPAT tristate "PMEM DAX: support the deprecated /sys/class/dax interface" depends on m && DEV_DAX_PMEM=m default DEV_DAX_PMEM help Older versions of the libdaxctl library expect to find all device-dax instances under /sys/class/dax. If libdaxctl in your distribution is older than v58 say M, otherwise say N. endif