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Marek Szyprowski
03521c892b
Commit370645f41e("dma-mapping: force bouncing if the kmalloc() size is not cache-line-aligned") introduced DMA_BOUNCE_UNALIGNED_KMALLOC feature and permitted architecture specific code configure kmalloc slabs with sizes smaller than the value of dma_get_cache_alignment(). When that feature is enabled, the physical address of some small kmalloc()-ed buffers might be not aligned to the CPU cachelines, thus not really suitable for typical DMA. To properly handle that case a SWIOTLB buffer bouncing is used, so no CPU cache corruption occurs. When that happens, there is no point reporting a false-positive DMA-API warning that the buffer is not properly aligned, as this is not a client driver fault. [[email protected]: replace is_swiotlb_allocated() with is_swiotlb_active(), per Catalin] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Fixes:370645f41e("dma-mapping: force bouncing if the kmalloc() size is not cache-line-aligned") Signed-off-by: Marek Szyprowski <[email protected]> Reviewed-by: Catalin Marinas <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Inki Dae <[email protected]> Cc: Robin Murohy <[email protected]> Cc: "Isaac J. Manjarres" <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]>