• Linus Torvalds's avatar
    Merge tag 'libnvdimm-for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm · 9f3a0941
    Linus Torvalds authored
    Pull libnvdimm updates from Dan Williams:
     "This cycle was was not something I ever want to repeat as there were
      several late changes that have only now just settled.
      Half of the branch up to commit d2c997c0 ("fs, dax: use
      page->mapping to warn...") have been in -next for several releases.
      The of_pmem driver and the address range scrub rework were late
      arrivals, and the dax work was scaled back at the last moment.
      The of_pmem driver missed a previous merge window due to an oversight.
      A sense of obligation to rectify that miss is why it is included for
      4.17. It has acks from PowerPC folks. Stephen reported a build failure
      that only occurs when merging it with your latest tree, for now I have
      fixed that up by disabling modular builds of of_pmem. A test merge
      with your tree has received a build success report from the 0day robot
      over 156 configs.
      An initial version of the ARS rework was submitted before the merge
      window. It is self contained to libnvdimm, a net code reduction, and
      passing all unit tests.
      The filesystem-dax changes are based on the wait_var_event()
      functionality from tip/sched/core. However, late review feedback
      showed that those changes regressed truncate performance to a large
      degree. The branch was rewound to drop the truncate behavior change
      and now only includes preparation patches and cleanups (with full acks
      and reviews). The finalization of this dax-dma-vs-trnucate work will
      need to wait for 4.18.
       - A rework of the filesytem-dax implementation provides for detection
         of unmap operations (truncate / hole punch) colliding with
         in-progress device-DMA. A fix for these collisions remains a
         work-in-progress pending resolution of truncate latency and
         starvation regressions.
       - The of_pmem driver expands the users of libnvdimm outside of x86
         and ACPI to describe an implementation of persistent memory on
         PowerPC with Open Firmware / Device tree.
       - Address Range Scrub (ARS) handling is completely rewritten to
         account for the fact that ARS may run for 100s of seconds and there
         is no platform defined way to cancel it. ARS will now no longer
         block namespace initialization.
       - The NVDIMM Namespace Label implementation is updated to handle
         label areas as small as 1K, down from 128K.
       - Miscellaneous cleanups and updates to unit test infrastructure"
    * tag 'libnvdimm-for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (39 commits)
      libnvdimm, of_pmem: workaround OF_NUMA=n build error
      nfit, address-range-scrub: add module option to skip initial ars
      nfit, address-range-scrub: rework and simplify ARS state machine
      nfit, address-range-scrub: determine one platform max_ars value
      powerpc/powernv: Create platform devs for nvdimm buses
      doc/devicetree: Persistent memory region bindings
      libnvdimm: Add device-tree based driver
      libnvdimm: Add of_node to region and bus descriptors
      libnvdimm, region: quiet region probe
      libnvdimm, namespace: use a safe lookup for dimm device name
      libnvdimm, dimm: fix dpa reservation vs uninitialized label area
      libnvdimm, testing: update the default smart ctrl_temperature
      libnvdimm, testing: Add emulation for smart injection commands
      nfit, address-range-scrub: introduce nfit_spa->ars_state
      libnvdimm: add an api to cast a 'struct nd_region' to its 'struct device'
      nfit, address-range-scrub: fix scrub in-progress reporting
      dax, dm: allow device-mapper to operate without dax support
      dax: introduce CONFIG_DAX_DRIVER
      fs, dax: use page->mapping to warn if truncate collides with a busy page
      ext2, dax: introduce ext2_dax_aops
block_dev.c 53.6 KB