[PATCH 07/12] mm: Remove redundant pXd_devmap calls

[Jason Gunthorpe]

On Thu, May 29, 2025 at 04:32:08PM +1000, Alistair Popple wrote:
> DAX was the only thing that created pmd_devmap and pud_devmap entries
> however it no longer does as DAX pages are now refcounted normally and
> pXd_trans_huge() returns true for those. Therefore checking both pXd_devmap
> and pXd_trans_huge() is redundant and the former can be removed without
> changing behaviour as it will always be false.
> 
> Signed-off-by: Alistair Popple <apopple at nvidia.com>
> ---
>  fs/dax.c                   |  5 ++---
>  include/linux/huge_mm.h    | 10 ++++------
>  include/linux/pgtable.h    |  2 +-
>  mm/hmm.c                   |  4 ++--
>  mm/huge_memory.c           | 30 +++++++++---------------------
>  mm/mapping_dirty_helpers.c |  4 ++--
>  mm/memory.c                | 15 ++++++---------
>  mm/migrate_device.c        |  2 +-
>  mm/mprotect.c              |  2 +-
>  mm/mremap.c                |  5 ++---
>  mm/page_vma_mapped.c       |  5 ++---
>  mm/pagewalk.c              |  8 +++-----
>  mm/pgtable-generic.c       |  7 +++----
>  mm/userfaultfd.c           |  4 ++--
>  mm/vmscan.c                |  3 ---
>  15 files changed, 40 insertions(+), 66 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason