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>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 1acfa73ce2ac..791a502f6906 100644
--- a/include/linux/slab_def.h
+++ b/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