[v3,hmm,0/9] Small hmm_range_fault() cleanups

Message

Jason Gunthorpe March 27, 2020, 8 p.m. UTC

From: Jason Gunthorpe <[e-mail]>

This is v3 with some minor adjustments made.

We are at the end of the dev cycle, and as nothing major has come up I'll push
this toward linux-next to get some coverage and decide next week what goes
this cycle.

v3 changes:
 - Keep NEED_WRITE_FAULT and NEED_FAULT separate (CH)
 - Use CH's vesion of hmm_can_fault and drop the inline
v2: https://lore.kernel.org/r/[e-mail]
v1: https://lore.kernel.org/r/[e-mail]

Thanks to everyone who looked on this,
Jason

Jason Gunthorpe (9):
  mm/hmm: remove pgmap checking for devmap pages
  mm/hmm: return the fault type from hmm_pte_need_fault()
  mm/hmm: remove unused code and tidy comments
  mm/hmm: remove HMM_FAULT_SNAPSHOT
  mm/hmm: remove the CONFIG_TRANSPARENT_HUGEPAGE #ifdef
  mm/hmm: use device_private_entry_to_pfn()
  mm/hmm: do not unconditionally set pfns when returning EBUSY
  mm/hmm: do not set pfns when returning an error code
  mm/hmm: return error for non-vma snapshots

 Documentation/vm/hmm.rst                |  12 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |   2 +-
 drivers/gpu/drm/nouveau/nouveau_svm.c   |   2 +-
 include/linux/hmm.h                     | 109 +--------
 mm/hmm.c                                | 307 +++++++++---------------
 5 files changed, 128 insertions(+), 304 deletions(-)