scsi: reduce use of block bounce buffers
We can rely on the dma-mapping code to handle any DMA limits that is bigger than the ISA DMA mask for us (either using an iommu or swiotlb), so remove setting the block layer bounce limit for anything but the unchecked_isa_dma case, or the bouncing for highmem pages. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJens Axboe <axboe@kernel.dk>
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