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

[David Hildenbrand]

On 29.03.24 06:38, Kasireddy, Vivek wrote:
> Hi David,
> 
>>
>> 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.
> No problem. Right, they are not in any tree yet. The first two mm patches that
> add the unpin_folios() and check_and_migrate_movable_folios() helpers still
> need to be reviewed.
> 
>>
>> I try to get this reviewed this week. If I fail to do that, please ping me.
> Ok, sounds good!

.. as it's already Friday (and even a public Holiday today+Monday here), 
let me prioritize this for next week!

-- 
Cheers,

David / dhildenb