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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-08-10 18:03:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-11 08:59:21 -0700 |
| commit | 3b9c6c11f519718d618f5d7c9508daf78b207f6f (patch) | |
| tree | 6c99992e25b9305fbe3977dff30f5eeb445f25e0 /Documentation | |
| parent | d80e0d96a328cc864a1cb359f545a6ed0c61812d (diff) | |
| download | lwn-3b9c6c11f519718d618f5d7c9508daf78b207f6f.tar.gz lwn-3b9c6c11f519718d618f5d7c9508daf78b207f6f.zip | |
dma-mapping: remove dma_is_consistent API
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 <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/DMA-API.txt | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt index 05e2ae236865..fe2326906610 100644 --- a/Documentation/DMA-API.txt +++ b/Documentation/DMA-API.txt @@ -456,12 +456,6 @@ 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) Returns the processor cache alignment. This is the absolute minimum |