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dma-mapping: remove dma_is_consistent API

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Architectures implement dma_is_consistent() in different ways (some
misinterpret the definition of API in DMA-API.txt).  So it hasn't been so
useful for drivers.  We have only one user of the API in tree.  Unlikely
out-of-tree drivers use the API.

Even if we fix dma_is_consistent() in some architectures, it doesn't look
useful at all.  It was invented long ago for some old systems that can't
allocate coherent memory at all.  It's better to export only APIs that are
definitely necessary for drivers.

Let's remove this API.

Signed-off-by: FUJITA Tomonori <[email protected]>
Cc: James Bottomley <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[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 18:03:25 -07:00 • committed by Linus Torvalds
commit 3b9c6c11f5
22 changed files with 0 additions and 68 deletions
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6
Documentation/DMA-API.txt
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@ -455,12 +455,6 @@ Free memory allocated by the nonconsistent API. All parameters must
be identical to those passed in (and returned by
dma_alloc_noncoherent()).
int
dma_is_consistent(struct device *dev, dma_addr_t dma_handle)
Returns true if the device dev is performing consistent DMA on the memory
area pointed to by the dma_handle.
int
dma_get_cache_alignment(void)