From: FUJITA Tomonori Date: Sat, 14 Aug 2010 07:36:17 +0000 (+0900) Subject: Documentation: DMA-API-HOWTO.txt: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ce00f7feb0a497b4280e1efe16e03728ed292687;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Linus Torvalds --- diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 3c4e07123e59..d568bc235bc0 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).