slab allocators: Remove obsolete SLAB_MUST_HWCACHE_ALIGN

This patch was recently posted to lkml and acked by Pekka.

The flag SLAB_MUST_HWCACHE_ALIGN is

1. Never checked by SLAB at all.

2. A duplicate of SLAB_HWCACHE_ALIGN for SLUB

3. Fulfills the role of SLAB_HWCACHE_ALIGN for SLOB.

The only remaining use is in sparc64 and ppc64 and their use there
reflects some earlier role that the slab flag once may have had. If
its specified then SLAB_HWCACHE_ALIGN is also specified.

The flag is confusing, inconsistent and has no purpose.

Remove it.

Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 67425c277e12..a9befa50d3e3 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -26,7 +26,6 @@ typedef struct kmem_cache kmem_cache_t __deprecated;
 #define SLAB_POISON             0x00000800UL    /* DEBUG: Poison objects */
 #define SLAB_HWCACHE_ALIGN      0x00002000UL    /* Align objs on cache lines */
 #define SLAB_CACHE_DMA          0x00004000UL    /* Use GFP_DMA memory */
-#define SLAB_MUST_HWCACHE_ALIGN 0x00008000UL    /* Force alignment even if debuggin is active */
 #define SLAB_STORE_USER         0x00010000UL    /* DEBUG: Store the last owner for bug hunting */
 #define SLAB_RECLAIM_ACCOUNT    0x00020000UL    /* Objects are reclaimable */
 #define SLAB_PANIC              0x00040000UL    /* Panic if kmem_cache_create() fails */