[$] A new DMA-mapping API

Leon Romanovsky began his session at the 2025 Linux Storage, Filesystem,
Memory Management, and BPF Summit (LSFMM+BPF) by explaining that the improved DMA-mapping API that he has been
working on is a group effort. He, Chaitanya Kulkarni, Christoph Hellwig,
Jason Gunthorpe, and others are proposing to modernize the API and to
'make it more suitable for current kernels'. He told the assembled
storage and filesystem developers that the progress on the proposal has
stalled, but that it was the basis for further work in various areas, so he
hoped to find a way to move forward with it.