Re: [PATCHv2 8/8] videobuf2: handle non-contiguous DMA allocations

[Christoph Hellwig]

On Thu, Jun 17, 2021 at 06:40:58PM +0900, Tomasz Figa wrote:
> Sorry, I meant dma_alloc_attrs() and yes, it's indeed a misnomer. Our
> use case basically has no need for the additional coherent mapping, so
> creation of it can be skipped to save some vmalloc space. (Yes, it
> probably only matters for 32-bit architectures.)

Yes, that is the normal use case, and it is solved by using
dma_alloc_noncoherent or dma_alloc_noncontigous without the vmap
step.