On Tue, 14 Jun 2011, Christoph Lameter wrote: > Index: linux-2.6/include/linux/slab.h > =================================================================== > --- linux-2.6.orig/include/linux/slab.h 2011-06-14 15:46:38.000000000 -0500 > +++ linux-2.6/include/linux/slab.h 2011-06-14 15:46:59.000000000 -0500 > @@ -133,6 +133,16 @@ unsigned int kmem_cache_size(struct kmem > #define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH) > #define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT) > > +#ifdef ARCH_DMA_MINALIGN > +#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN > +#else > +#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) > +#endif > + > +#ifndef ARCH_SLAB_MINALIGN > +#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) > +#endif > + > /* > * Common kmalloc functions provided by all allocators > */ > Index: linux-2.6/include/linux/slab_def.h > =================================================================== > --- linux-2.6.orig/include/linux/slab_def.h 2011-06-14 15:47:04.000000000 -0500 > +++ linux-2.6/include/linux/slab_def.h 2011-06-14 15:50:04.000000000 -0500 > @@ -18,32 +18,6 @@ > #include <trace/events/kmem.h> > > /* > - * 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. > - */ > -#ifdef ARCH_DMA_MINALIGN > -#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN > -#else > -#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 > * > * manages a cache. Looks like we lost some valuable information in the comments when this got moved to slab.h :( -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>