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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2010-08-14 16:36:17 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-14 11:56:46 -0700
commitce00f7feb0a497b4280e1efe16e03728ed292687 (patch)
tree43f643b31bb7208e62bba3d1d64549421d83a1be /Documentation
parentb171aa27700c78511086a759383b033949c9d7f0 (diff)
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Documentation: DMA-API-HOWTO.txt: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN
ARCH_KMALLOC_MINALIGN was renamed to ARCH_DMA_MINALIGN (the commit a6eb9fe105d5de0053b261148cee56c94b4720ca). ARCH_DMA_MINALIGN must be defined instead of ARCH_KMALLOC_MINALIGN to ensure that kmalloc'ed buffer is DMA-safe. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/DMA-API-HOWTO.txt6
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index 3c4e07123e5..d568bc235bc 100644
--- a/Documentation/DMA-API-HOWTO.txt
+++ b/Documentation/DMA-API-HOWTO.txt
@@ -738,17 +738,17 @@ to "Closing".
CONFIG_NEED_SG_DMA_LENGTH if the architecture supports IOMMUs
(including software IOMMU).
-2) ARCH_KMALLOC_MINALIGN
+2) ARCH_DMA_MINALIGN
Architectures must ensure that kmalloc'ed buffer is
DMA-safe. Drivers and subsystems depend on it. If an architecture
isn't fully DMA-coherent (i.e. hardware doesn't ensure that data in
the CPU cache is identical to data in main memory),
- ARCH_KMALLOC_MINALIGN must be set so that the memory allocator
+ ARCH_DMA_MINALIGN must be set so that the memory allocator
makes sure that kmalloc'ed buffer doesn't share a cache line with
the others. See arch/arm/include/asm/cache.h as an example.
- Note that ARCH_KMALLOC_MINALIGN is about DMA memory alignment
+ Note that ARCH_DMA_MINALIGN is about DMA memory alignment
constraints. You don't need to worry about the architecture data
alignment constraints (e.g. the alignment constraints about 64-bit
objects).