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dma-mapping: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN

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Now each architecture has the own dma_get_cache_alignment implementation.

dma_get_cache_alignment returns the minimum DMA alignment.  Architectures
define it as ARCH_KMALLOC_MINALIGN (it's used to make sure that malloc'ed
buffer is DMA-safe; the buffer doesn't share a cache with the others).  So
we can unify dma_get_cache_alignment implementations.

This patch:

dma_get_cache_alignment() needs to know if an architecture defines
ARCH_KMALLOC_MINALIGN or not (needs to know if architecture has DMA
alignment restriction).  However, slab.h define ARCH_KMALLOC_MINALIGN if
architectures doesn't define it.

Let's rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN.
ARCH_KMALLOC_MINALIGN is used only in the internals of slab/slob/slub
(except for crypto).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
FUJITA Tomonori 2010-08-10 18:03:22 -07:00 • committed by Linus Torvalds
parent cd1542c819
commit a6eb9fe105
16 changed files with 25 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/mips/include/asm/mach-generic/kmalloc.h
View file

@ -7,7 +7,7 @@
* Total overkill for most systems but need as a safe default.
* Set this one if any device in the system might do non-coherent DMA.
*/
#define ARCH_KMALLOC_MINALIGN 128
#define ARCH_DMA_MINALIGN 128
#endif
#endif /* __ASM_MACH_GENERIC_KMALLOC_H */

2
arch/mips/include/asm/mach-ip27/kmalloc.h
View file

@ -2,7 +2,7 @@
#define __ASM_MACH_IP27_KMALLOC_H
/*
* All happy, no need to define ARCH_KMALLOC_MINALIGN
* All happy, no need to define ARCH_DMA_MINALIGN
*/
#endif /* __ASM_MACH_IP27_KMALLOC_H */

4
arch/mips/include/asm/mach-ip32/kmalloc.h
View file

@ -3,9 +3,9 @@
#if defined(CONFIG_CPU_R5000) || defined(CONFIG_CPU_RM7000)
#define ARCH_KMALLOC_MINALIGN 32
#define ARCH_DMA_MINALIGN 32
#else
#define ARCH_KMALLOC_MINALIGN 128
#define ARCH_DMA_MINALIGN 128
#endif
#endif /* __ASM_MACH_IP32_KMALLOC_H */