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[PATCH] arm: add comment about dma_supported()

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From: Russell King <rmk+lkml@arm.linux.org.uk>

The ARM dma_supported() is rather basic, and I don't think it takes into
account everything that it should do (eg, whether the mask agrees with what
we'd return for GFP_DMA allocations).  Note this.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org 2005-04-16 15:23:57 -07:00 committed by Linus Torvalds
parent 7aa52f5128
commit 7a228aaa87
1 changed files with 3 additions and 0 deletions
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3
include/asm-arm/dma-mapping.h
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@ -21,6 +21,9 @@ extern void consistent_sync(void *kaddr, size_t size, int rw);
* properly. For example, if your device can only drive the low 24-bits * properly. For example, if your device can only drive the low 24-bits
* during bus mastering, then you would pass 0x00ffffff as the mask * during bus mastering, then you would pass 0x00ffffff as the mask
* to this function. * to this function.
*
* FIXME: This should really be a platform specific issue - we should
* return false if GFP_DMA allocations may not satisfy the supplied 'mask'.
*/ */
static inline int dma_supported(struct device *dev, u64 mask) static inline int dma_supported(struct device *dev, u64 mask)
{ {