libnvdimm subsystem updated for PMEM and DAX.  The libnvdimm kernel subsystem, which is responsible for the detection, configuration, and management of Non-Volatile Dual Inline Memory Modules (NVDIMMs) is updated in UEK R5U1 to take advantage a large number of upstream patches, bug fixes and backports. Notably, these include fixes to /proc/smaps to reflect the actual PMEM page size and some work to improve Address Range Scrub (ARS). Also included as a notable improvement, is a fix that includes a new hand-shake mechanism that causes the fs thread to wait until DMA completion before waking up to update the fs metadata.

NVMe updates.  General modifications to NVMe code are included in this update. Build configuration options were synchronized to ensure equivalence and compatibility in aarch64 environments. A patch was also applied to resolve an issue with NVMe hotplug/unplug functionality when used with a KVM guest.