[PATCH v1 0/2] mm: remove extra ZONE_DEVICE struct page refcount

[Alex Sierra <alex.sierra@amd.com>]

This patch cleans up ZONE_DEVICE page refcounting. Quoting Matthew
Wilcox, "it removes a ton of cruft from every call to put_page()"
This work was originally done by Ralph Campbell and submitted as RFC.
As of today, it has been ack by Theodore Ts'o / Darrick J. Wong, and
reviewed by Christoph Hellwig.
https://lore.kernel.org/linux-mm/20201001181715.17416-1-rcampbell@nvidia.com/

"MEMORY_DEVICE_COHERENT for CPU-accessible coherent device memory"
patchset depends on this patchset.
https://lore.kernel.org/linux-mm/20211012171247.2861-1-alex.sierra@amd.com/

Ralph Campbell (2):
  ext4/xfs: add page refcount helper
  mm: remove extra ZONE_DEVICE struct page refcount

 arch/powerpc/kvm/book3s_hv_uvmem.c     |  2 +-
 drivers/gpu/drm/nouveau/nouveau_dmem.c |  2 +-
 fs/dax.c                               |  8 +--
 fs/ext4/inode.c                        |  5 +-
 fs/fuse/dax.c                          |  4 +-
 fs/xfs/xfs_file.c                      |  4 +-
 include/linux/dax.h                    | 10 ++++
 include/linux/memremap.h               |  7 +--
 include/linux/mm.h                     | 11 ----
 lib/test_hmm.c                         |  2 +-
 mm/internal.h                          |  8 +++
 mm/memcontrol.c                        |  6 +--
 mm/memremap.c                          | 69 +++++++-------------------
 mm/migrate.c                           |  5 --
 mm/page_alloc.c                        |  3 ++
 mm/swap.c                              | 45 ++---------------
 16 files changed, 60 insertions(+), 131 deletions(-)

-- 
2.32.0