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dma-mapping: unify dma_get_cache_alignment implementations

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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>
This commit is contained in:
FUJITA Tomonori
2010-08-10 18:03:22 -07:00
committed by Linus Torvalds
parent a6eb9fe105
commit 4565f0170d
20 changed files with 8 additions and 114 deletions
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7
arch/x86/include/asm/dma-mapping.h
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@@ -87,13 +87,6 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
flush_write_buffers();
}
static inline int dma_get_cache_alignment(void)
{
/* no easy way to get cache size on all x86, so return the
* maximum possible, to be safe */
return boot_cpu_data.x86_clflush_size;
}
static inline unsigned long dma_alloc_coherent_mask(struct device *dev,
gfp_t gfp)
{