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Commit 1f0ce8b3 authored by David Woodhouse's avatar David Woodhouse Committed by Pekka Enberg
Browse files

mm: Move ARCH_SLAB_MINALIGN and ARCH_KMALLOC_MINALIGN to <linux/slab_def.h> 



Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
parent e40152ee

include/linux/slab_def.h

+24 −0
Original line number Diff line number Diff line
@@ -16,6 +16,30 @@ 
#include <linux/compiler.h>

#include <linux/kmemtrace.h>



#ifndef ARCH_KMALLOC_MINALIGN

/*

 * Enforce a minimum alignment for the kmalloc caches.

 * Usually, the kmalloc caches are cache_line_size() aligned, except when

 * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned.

 * Some archs want to perform DMA into kmalloc caches and need a guaranteed

 * alignment larger than the alignment of a 64-bit integer.

 * ARCH_KMALLOC_MINALIGN allows that.

 * Note that increasing this value may disable some debug features.

 */

#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)

#endif



#ifndef ARCH_SLAB_MINALIGN

/*

 * Enforce a minimum alignment for all caches.

 * Intended for archs that get misalignment faults even for BYTES_PER_WORD

 * aligned buffers. Includes ARCH_KMALLOC_MINALIGN.

 * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables

 * some debug features.

 */

#define ARCH_SLAB_MINALIGN 0

#endif



/*

 * struct kmem_cache

 *

mm/slab.c

+0 −24
Original line number Diff line number Diff line
@@ -144,30 +144,6 @@ 
#define	BYTES_PER_WORD		sizeof(void *)

#define	REDZONE_ALIGN		max(BYTES_PER_WORD, __alignof__(unsigned long long))



#ifndef ARCH_KMALLOC_MINALIGN

/*

 * Enforce a minimum alignment for the kmalloc caches.

 * Usually, the kmalloc caches are cache_line_size() aligned, except when

 * DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned.

 * Some archs want to perform DMA into kmalloc caches and need a guaranteed

 * alignment larger than the alignment of a 64-bit integer.

 * ARCH_KMALLOC_MINALIGN allows that.

 * Note that increasing this value may disable some debug features.

 */

#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)

#endif



#ifndef ARCH_SLAB_MINALIGN

/*

 * Enforce a minimum alignment for all caches.

 * Intended for archs that get misalignment faults even for BYTES_PER_WORD

 * aligned buffers. Includes ARCH_KMALLOC_MINALIGN.

 * If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables

 * some debug features.

 */

#define ARCH_SLAB_MINALIGN 0

#endif



#ifndef ARCH_KMALLOC_FLAGS

#define ARCH_KMALLOC_FLAGS SLAB_HWCACHE_ALIGN

#endif