Re: [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page refcount

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On 1/28/22 06:21, Jason Gunthorpe wrote:
On Thu, Jan 27, 2022 at 05:25:52PM -0700, Logan Gunthorpe wrote:
From: Ralph Campbell <rcampbell@xxxxxxxxxx>

ZONE_DEVICE struct pages have an extra reference count that complicates the
code for put_page() and several places in the kernel that need to check the
reference count to see that a page is not being used (gup, compaction,
migration, etc.). Clean up the code so the reference count doesn't need to
be treated specially for ZONE_DEVICE.

[logang: dropped no longer used section from mm.h including
  page_is_devmap_managed, rebased on v5.17-rc1 (possibly poorly)]
Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
  arch/powerpc/kvm/book3s_hv_uvmem.c     |  2 +-
  drivers/gpu/drm/nouveau/nouveau_dmem.c |  2 +-
  fs/dax.c                               |  4 +-
  include/linux/dax.h                    |  2 +-
  include/linux/memremap.h               |  7 +--
  include/linux/mm.h                     | 44 ----------------
  lib/test_hmm.c                         |  2 +-
  mm/internal.h                          |  8 +++
  mm/memcontrol.c                        |  6 +--
  mm/memremap.c                          | 70 +++++++-------------------
  mm/migrate.c                           |  5 --
  mm/page_alloc.c                        |  3 ++
  mm/swap.c                              | 45 ++---------------
  13 files changed, 46 insertions(+), 154 deletions(-)
This patch still can't be applied until the FSDAX issues are solved,
right? See my remarks the last time it was posted..

Jason

That is my understanding too.




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