• Linus Torvalds's avatar
    Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma · aa32f116
    Linus Torvalds authored
    Pull hmm updates from Jason Gunthorpe:
     "This is another round of bug fixing and cleanup. This time the focus
      is on the driver pattern to use mmu notifiers to monitor a VA range.
      This code is lifted out of many drivers and hmm_mirror directly into
      the mmu_notifier core and written using the best ideas from all the
      driver implementations.
    
      This removes many bugs from the drivers and has a very pleasing
      diffstat. More drivers can still be converted, but that is for another
      cycle.
    
       - A shared branch with RDMA reworking the RDMA ODP implementation
    
       - New mmu_interval_notifier API. This is focused on the use case of
         monitoring a VA and simplifies the process for drivers
    
       - A common seq-count locking scheme built into the
         mmu_interval_notifier API usable by drivers that call
         get_user_pages() or hmm_range_fault() with the VA range
    
       - Conversion of mlx5 ODP, hfi1, radeon, nouveau, AMD GPU, and Xen
         GntDev drivers to the new API. This deletes a lot of wonky driver
         code.
    
       - Two improvements for hmm_range_fault(), from testing done by Ralph"
    
    * tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
      mm/hmm: remove hmm_range_dma_map and hmm_range_dma_unmap
      mm/hmm: make full use of walk_page_range()
      xen/gntdev: use mmu_interval_notifier_insert
      mm/hmm: remove hmm_mirror and related
      drm/amdgpu: Use mmu_interval_notifier instead of hmm_mirror
      drm/amdgpu: Use mmu_interval_insert instead of hmm_mirror
      drm/amdgpu: Call find_vma under mmap_sem
      nouveau: use mmu_interval_notifier instead of hmm_mirror
      nouveau: use mmu_notifier directly for invalidate_range_start
      drm/radeon: use mmu_interval_notifier_insert
      RDMA/hfi1: Use mmu_interval_notifier_insert for user_exp_rcv
      RDMA/odp: Use mmu_interval_notifier_insert()
      mm/hmm: define the pre-processor related parts of hmm.h even if disabled
      mm/hmm: allow hmm_range to be used with a mmu_interval_notifier or hmm_mirror
      mm/mmu_notifier: add an interval tree notifier
      mm/mmu_notifier: define the header pre-processor parts even if disabled
      mm/hmm: allow snapshot of the special zero page
    aa32f116
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