Hi Andrew,
> Subject: [PATCH v16 0/9] mm/gup: Introduce memfd_pin_folios() for pinning
> memfd folios
>
> Currently, some drivers (e.g, Udmabuf) that want to longterm-pin
> the pages/folios associated with a memfd, do so by simply taking a
> reference on them. This is not
Currently, some drivers (e.g, Udmabuf) that want to longterm-pin
the pages/folios associated with a memfd, do so by simply taking a
reference on them. This is not desirable because the pages/folios
may reside in Movable zone or CMA block.
Therefore, having drivers use memfd_pin_folios() API
