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dma-mapping: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/include/asm/cache.h
View File

@ -14,7 +14,7 @@
* cache before the transfer is done, causing old data to be seen by
* the CPU.
*/
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
/*
* With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.

2
arch/avr32/include/asm/cache.h
View File

@ -11,7 +11,7 @@
* cache before the transfer is done, causing old data to be seen by
* the CPU.
*/
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#ifndef __ASSEMBLER__
struct cache_info {

2
arch/blackfin/include/asm/cache.h
View File

@ -15,7 +15,7 @@
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#ifdef CONFIG_SMP
#define __cacheline_aligned

2
arch/frv/include/asm/mem-layout.h
View File

@ -35,7 +35,7 @@
* the slab must be aligned such that load- and store-double instructions don't
* fault if used
*/
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES
/*****************************************************************************/

2
arch/m68k/include/asm/cache.h
View File

@ -8,6 +8,6 @@
#define L1_CACHE_SHIFT 4
#define L1_CACHE_BYTES (1<< L1_CACHE_SHIFT)
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif

2
arch/microblaze/include/asm/page.h
View File

@ -40,7 +40,7 @@
#ifndef __ASSEMBLY__
/* MS be sure that SLAB allocates aligned objects */
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#define ARCH_SLAB_MINALIGN L1_CACHE_BYTES

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 */

2
arch/mn10300/include/asm/cache.h
View File

@ -21,7 +21,7 @@
#define L1_CACHE_DISPARITY L1_CACHE_NENTRIES * L1_CACHE_BYTES
#endif
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
/* data cache purge registers
* - read from the register to unconditionally purge that cache line

2
arch/powerpc/include/asm/page_32.h
View File

@ -10,7 +10,7 @@
#define VM_DATA_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS32
#ifdef CONFIG_NOT_COHERENT_CACHE
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif
#ifdef CONFIG_PTE_64BIT

2
arch/sh/include/asm/page.h
View File

@ -180,7 +180,7 @@ typedef struct page *pgtable_t;
* Some drivers need to perform DMA into kmalloc'ed buffers
* and so we have to increase the kmalloc minalign for this.
*/
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#ifdef CONFIG_SUPERH64
/*

2
arch/xtensa/include/asm/cache.h
View File

@ -29,6 +29,6 @@
# define CACHE_WAY_SIZE ICACHE_WAY_SIZE
#endif
#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif /* _XTENSA_CACHE_H */

4
include/linux/slab_def.h
View File

@ -17,7 +17,6 @@
#include <trace/events/kmem.h>
#ifndef ARCH_KMALLOC_MINALIGN
/*
* Enforce a minimum alignment for the kmalloc caches.
* Usually, the kmalloc caches are cache_line_size() aligned, except when
@ -27,6 +26,9 @@
* ARCH_KMALLOC_MINALIGN allows that.
* Note that increasing this value may disable some debug features.
*/
#ifdef ARCH_DMA_MINALIGN
#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
#else
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
#endif

4
include/linux/slob_def.h
View File

@ -1,7 +1,9 @@
#ifndef __LINUX_SLOB_DEF_H
#define __LINUX_SLOB_DEF_H
#ifndef ARCH_KMALLOC_MINALIGN
#ifdef ARCH_DMA_MINALIGN
#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
#else
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long)
#endif

8
include/linux/slub_def.h
View File

@ -106,15 +106,17 @@ struct kmem_cache {
/*
* Kmalloc subsystem.
*/
#if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8
#define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN
#if defined(ARCH_DMA_MINALIGN) && ARCH_DMA_MINALIGN > 8
#define KMALLOC_MIN_SIZE ARCH_DMA_MINALIGN
#else
#define KMALLOC_MIN_SIZE 8
#endif
#define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE)
#ifndef ARCH_KMALLOC_MINALIGN
#ifdef ARCH_DMA_MINALIGN
#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
#else
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
#endif