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CONFIG_ZONE_DEVICE: Device memory (pmem, HMM, etc...) hotplug support

General informations

The Linux kernel configuration item CONFIG_ZONE_DEVICE has multiple definitions:

Device memory (pmem, HMM, etc...) hotplug support found in mm/Kconfig

The configuration item CONFIG_ZONE_DEVICE:

Help text

Device memory hotplug support allows for establishing pmem, or other device driver discovered memory regions, in the memmap. This allows pfn_to_page() lookups of otherwise "device-physical" addresses which is needed for using a DAX mapping in an O_DIRECT operation, among other things.

If FS_DAX is enabled, then say Y.

Device memory (pmem, etc...) hotplug support found in mm/Kconfig

The configuration item CONFIG_ZONE_DEVICE:

Help text

Device memory hotplug support allows for establishing pmem, or other device driver discovered memory regions, in the memmap. This allows pfn_to_page() lookups of otherwise "device-physical" addresses which is needed for using a DAX mapping in an O_DIRECT operation, among other things.

If FS_DAX is enabled, then say Y.

Hardware

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