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! Thanks, Vivek > > -- > Cheers, > > David / dhildenb
