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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 <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
FUJITA Tomonori 2010-08-10 18:03:22 -07:00 • committed by Linus Torvalds
commit 4565f0170d
20 changed files with 8 additions and 114 deletions
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2
arch/ia64/include/asm/dma-mapping.h
View file

@ -86,8 +86,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
return daddr;
}
extern int dma_get_cache_alignment(void);
static inline void
dma_cache_sync (struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir)

6
arch/ia64/kernel/setup.c
View file

@ -98,12 +98,6 @@ static struct resource bss_resource = {
unsigned long ia64_max_cacheline_size;
int dma_get_cache_alignment(void)
{
return ia64_max_cacheline_size;
}
EXPORT_SYMBOL(dma_get_cache_alignment);
unsigned long ia64_iobase; /* virtual address for I/O accesses */
EXPORT_SYMBOL(ia64_iobase);
struct io_space io_space[MAX_IO_SPACES];