[PATCH v6 02/13] mm: remove extra ZONE_DEVICE struct page refcount

[Ralph Campbell]

On 8/12/21 11:31 PM, Alex Sierra wrote:
> From: Ralph Campbell <rcampbell at nvidia.com>
>
> 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.
>
> v2:
> AS: merged this patch in linux 5.11 version
>
> v5:
> AS: add condition at try_grab_page to check for the zone device type, while
> page ref counter is checked less/equal to zero. In case of device zone, pages
> ref counter are initialized to zero.
>
> Signed-off-by: Ralph Campbell <rcampbell at nvidia.com>
> Signed-off-by: Alex Sierra <alex.sierra at amd.com>
> ---
>   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                     | 13 +----
>   lib/test_hmm.c                         |  2 +-
>   mm/internal.h                          |  8 +++
>   mm/memremap.c                          | 68 +++++++-------------------
>   mm/migrate.c                           |  5 --
>   mm/page_alloc.c                        |  3 ++
>   mm/swap.c                              | 45 ++---------------
>   12 files changed, 46 insertions(+), 115 deletions(-)
>
I haven't seen a response to the issues I raised back at v3 of this series.
https://lore.kernel.org/linux-mm/4f6dd918-d79b-1aa7-3a4c-caa67ddc29bc@nvidia.com/

Did I miss something?