Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN

[Christoph Hellwig]

Btw, there is another option:  Most real systems already require having
swiotlb to bounce buffer in some cases.  We could simply force bounce
buffering in the dma mapping code for too small or not properly aligned
transfers and just decrease the dma alignment.