dma-mapping: unify dma_get_cache_alignment implementations

dma_get_cache_alignment returns the minimum DMA alignment.  Architectures
defines it as ARCH_DMA_MINALIGN (formally ARCH_KMALLOC_MINALIGN).  So we
can unify dma_get_cache_alignment implementations.

Note that some architectures implement dma_get_cache_alignment wrongly.
dma_get_cache_alignment() should return the minimum DMA alignment.  So
fully-coherent architectures should return 1.  This patch also fixes this
issue.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 9 deletions

diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
index 4b4a0c0b0ccd..74db853ec2cf 100644
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -52,15 +52,6 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
         return (dma_addr == DMA_ERROR_CODE);
 }
 
-static inline int dma_get_cache_alignment(void)
-{
-        /*
-         * no easy way to get cache size on all processors, so return
-         * the maximum possible, to be safe
-         */
-        return (1 << INTERNODE_CACHE_SHIFT);
-}
-
 static inline int dma_set_mask(struct device *dev, u64 mask)
 {
 #ifdef CONFIG_PCI