[PATCH v12 0/8] mm/gup: Introduce memfd_pin_folios() for pinning memfd folios

[David Hildenbrand]

On 25.02.24 08:56, Vivek Kasireddy wrote:
> 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 ensures that
> the folios are appropriately pinned via FOLL_PIN for longterm DMA.
> 
> This patchset also introduces a few helpers and converts the Udmabuf
> driver to use folios and memfd_pin_folios() API to longterm-pin
> the folios for DMA. Two new Udmabuf selftests are also included to
> test the driver and the new API.
> 
> ---

Sorry Vivek, I got distracted. What's the state of this? I assume it's 
not in an mm tree yet.

I try to get this reviewed this week. If I fail to do that, please ping me.

-- 
Cheers,

David / dhildenb