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authorDan Williams <dan.j.williams@intel.com>2009-06-03 14:22:28 -0700
committerDan Williams <dan.j.williams@intel.com>2009-06-03 14:22:28 -0700
commit04ce9ab385dc97eb55299d533cd3af79b8fc7529 (patch)
tree9b8d0b9c1eba820a8a107d05abc2e2f8d4d20a59 /drivers/dma
parenta08abd8ca890a377521d65d493d174bebcaf694b (diff)
downloadop-kernel-dev-04ce9ab385dc97eb55299d533cd3af79b8fc7529.zip
op-kernel-dev-04ce9ab385dc97eb55299d533cd3af79b8fc7529.tar.gz
async_xor: permit callers to pass in a 'dma/page scribble' region
async_xor() needs space to perform dma and page address conversions. In most cases the code can simply reuse the struct page * array because the size of the native pointer matches the size of a dma/page address. In order to support archs where sizeof(dma_addr_t) is larger than sizeof(struct page *), or to preserve the input parameters, we utilize a memory region passed in by the caller. Since the code is now prepared to handle the case where it cannot perform address conversions on the stack, we no longer need the !HIGHMEM64G dependency in drivers/dma/Kconfig. [ Impact: don't clobber input buffers for address conversions ] Reviewed-by: Andre Noll <maan@systemlinux.org> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 3b3c01b..912a51b 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -4,7 +4,7 @@
menuconfig DMADEVICES
bool "DMA Engine support"
- depends on !HIGHMEM64G && HAS_DMA
+ depends on HAS_DMA
help
DMA engines can do asynchronous data transfers without
involving the host CPU. Currently, this framework can be
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