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>

arch/arm/include/asm/cache.h

@@ -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.

arch/avr32/include/asm/cache.h

@@ -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 {

arch/blackfin/include/asm/cache.h

@@ -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

arch/frv/include/asm/mem-layout.h

@@ -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
 
 /*****************************************************************************/

arch/m68k/include/asm/cache.h

@@ -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

arch/microblaze/include/asm/page.h

@@ -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
 

arch/mips/include/asm/mach-generic/kmalloc.h

@@ -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 */

arch/mips/include/asm/mach-ip27/kmalloc.h

@@ -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 */

arch/mips/include/asm/mach-ip32/kmalloc.h

@@ -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 */

arch/mn10300/include/asm/cache.h

@@ -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

arch/powerpc/include/asm/page_32.h

@@ -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

arch/sh/include/asm/page.h

@@ -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
 /*

arch/xtensa/include/asm/cache.h

@@ -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 */

include/linux/slab_def.h

@@ -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
 

include/linux/slob_def.h

@@ -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
 

include/linux/slub_def.h

@@ -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