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| author |   Michal Marek <mmarek@suse.cz> | 2013-02-25 21:50:05 +0100 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2013-02-25 21:51:57 +0100 |
| commit | e3900e74f26fc924c8e9e2a922bd40369b0bb517 (patch) | |
| tree | 6e868575d346032ba9408f350c6e5369e0e52b0d /Documentation/DMA-attributes.txt | |
| parent | kbuild: Fix missing '\n' for NEW symbols in yes "" | make oldconfig >conf.new (diff) | |
| parent | Merge branch 'yem-kconfig-rc-fixes' of git://gitorious.org/linux-kconfig/linux-kconfig into kbuild/rc-fixes (diff) | |
| download | linux-dev-e3900e74f26fc924c8e9e2a922bd40369b0bb517.tar.xz linux-dev-e3900e74f26fc924c8e9e2a922bd40369b0bb517.zip | |
Merge branch 'kbuild/rc-fixes' into kbuild/kconfig
There is one kconfig fix in the rc-fixes branch that I forgot to submit
for 3.8, so let's add it to the kconfig branch for 3.9-rc1.
Diffstat (limited to 'Documentation/DMA-attributes.txt')
| -rw-r--r-- | Documentation/DMA-attributes.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt index f50309081ac7..e59480db9ee0 100644 --- a/Documentation/DMA-attributes.txt +++ b/Documentation/DMA-attributes.txt @@ -91,3 +91,12 @@ transferred to 'device' domain. This attribute can be also used for dma_unmap_{single,page,sg} functions family to force buffer to stay in device domain after releasing a mapping for it. Use this attribute with care! + +DMA_ATTR_FORCE_CONTIGUOUS +------------------------- + +By default DMA-mapping subsystem is allowed to assemble the buffer +allocated by dma_alloc_attrs() function from individual pages if it can +be mapped as contiguous chunk into device dma address space. By +specifing this attribute the allocated buffer is forced to be contiguous +also in physical memory. |