On Sat, Feb 19, 2022 at 08:52:21AM +0800, Baoquan He wrote: > Use dma_alloc_noncoherent() instead of directly allocating buffer > from kmalloc with GFP_DMA. DMA API will try to allocate buffer > depending on devices addressing limitation. I think it would be better to still allocate the buffer at allocation time and then just transfer ownership using dma_sync_single* in the I/O path to avoid the GFP_ATOMIC allocation.
