mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 00:01:35 +00:00
a6eb9fe105
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>
27 lines
700 B
C
27 lines
700 B
C
/*
|
|
* arch/arm/include/asm/cache.h
|
|
*/
|
|
#ifndef __ASMARM_CACHE_H
|
|
#define __ASMARM_CACHE_H
|
|
|
|
#define L1_CACHE_SHIFT CONFIG_ARM_L1_CACHE_SHIFT
|
|
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
|
|
|
|
/*
|
|
* Memory returned by kmalloc() may be used for DMA, so we must make
|
|
* sure that all such allocations are cache aligned. Otherwise,
|
|
* unrelated code may cause parts of the buffer to be read into the
|
|
* cache before the transfer is done, causing old data to be seen by
|
|
* the CPU.
|
|
*/
|
|
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
|
|
|
|
/*
|
|
* With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
|
|
*/
|
|
#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
|
|
#define ARCH_SLAB_MINALIGN 8
|
|
#endif
|
|
|
|
#endif
|