Re: [PATCH 02/12] mm: Convert pXd_devmap checks to vma_is_dax

[Jason Gunthorpe]

On Thu, May 29, 2025 at 04:32:03PM +1000, Alistair Popple wrote:
> Currently dax is the only user of pmd and pud mapped ZONE_DEVICE
> pages. Therefore page walkers that want to exclude DAX pages can check
> pmd_devmap or pud_devmap. However soon dax will no longer set PFN_DEV,
> meaning dax pages are mapped as normal pages.
> 
> Ensure page walkers that currently use pXd_devmap to skip DAX pages
> continue to do so by adding explicit checks of the VMA instead.
> 
> Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
> ---
>  fs/userfaultfd.c | 2 +-
>  mm/hmm.c         | 2 +-
>  mm/userfaultfd.c | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason