Function dma_opt_mapping_size() implies from its name that it returns a target or sweet spot DMA mapping size. However, it is just an upper limit optimal DMA mapping size. Above this size, DMA mapping performance may significantly degrade. Rename to dma_max_opt_mapping_size() to reflect the real behaviour. Also rename the internal DMA mapping symbols to align with this. The DMA API documentation already described this behaviour properly (so there is nothing to update). Signed-off-by: John Garry <john.garry@linux.dev> Link: https://lore.kernel.org/r/20260831093620.3481337-1-john.g.garry@oracle.com Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>