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| author | Christoph Lameter <cl@linux.com> | 2011-06-23 09:36:12 -0500 |
|---|---|---|
| committer | Pekka Enberg <penberg@kernel.org> | 2011-07-07 21:04:12 +0300 |
| commit | 90810645f78f894acfb04b3768e8a7d45f2b303a (patch) | |
| tree | 114dce690d2f74cdb347e68d1386c605cdeee093 /include/linux/slab.h | |
| parent | 3192b920bf7d0c528ab54e7d3689f44055316a37 (diff) | |
| download | lwn-90810645f78f894acfb04b3768e8a7d45f2b303a.tar.gz lwn-90810645f78f894acfb04b3768e8a7d45f2b303a.zip | |
slab allocators: Provide generic description of alignment defines
Provide description for alignment defines.
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Diffstat (limited to 'include/linux/slab.h')
| -rw-r--r-- | include/linux/slab.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index 646a639a4aae..573c809c33d9 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -133,12 +133,22 @@ unsigned int kmem_cache_size(struct kmem_cache *); #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH) #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT) +/* + * Some archs want to perform DMA into kmalloc caches and need a guaranteed + * alignment larger than the alignment of a 64-bit integer. + * Setting ARCH_KMALLOC_MINALIGN in arch headers allows that. + */ #ifdef ARCH_DMA_MINALIGN #define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN #else #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) #endif +/* + * Setting ARCH_SLAB_MINALIGN in arch headers allows a different alignment. + * Intended for arches that get misalignment faults even for 64 bit integer + * aligned buffers. + */ #ifndef ARCH_SLAB_MINALIGN #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #endif |