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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>

authored by

FUJITA Tomonori and committed by
Linus Torvalds ce00f7fe b171aa27

+3 -3
+3 -3
Documentation/DMA-API-HOWTO.txt
··· 738 738 CONFIG_NEED_SG_DMA_LENGTH if the architecture supports IOMMUs 739 739 (including software IOMMU). 740 740 741 - 2) ARCH_KMALLOC_MINALIGN 741 + 2) ARCH_DMA_MINALIGN 742 742 743 743 Architectures must ensure that kmalloc'ed buffer is 744 744 DMA-safe. Drivers and subsystems depend on it. If an architecture 745 745 isn't fully DMA-coherent (i.e. hardware doesn't ensure that data in 746 746 the CPU cache is identical to data in main memory), 747 - ARCH_KMALLOC_MINALIGN must be set so that the memory allocator 747 + ARCH_DMA_MINALIGN must be set so that the memory allocator 748 748 makes sure that kmalloc'ed buffer doesn't share a cache line with 749 749 the others. See arch/arm/include/asm/cache.h as an example. 750 750 751 - Note that ARCH_KMALLOC_MINALIGN is about DMA memory alignment 751 + Note that ARCH_DMA_MINALIGN is about DMA memory alignment 752 752 constraints. You don't need to worry about the architecture data 753 753 alignment constraints (e.g. the alignment constraints about 64-bit 754 754 objects).