[patch 4/6] slub: avoid compiling SLAB_CACHE_DMA without DMAsupport

[David Rientjes]

If CONFIG_ZONE_DMA is disabled, SLAB_CACHE_DMA is a no-op.  Avoid
compiling support for it on such a configuration.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 mm/slub.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -162,7 +162,10 @@ static inline int kmem_cache_debug(struct kmem_cache *s)
 		SLAB_FAILSLAB)
 
 #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \
-		SLAB_CACHE_DMA | SLAB_NOTRACK)
+# ifdef CONFIG_ZONE_DMA
+		SLAB_CACHE_DMA | \
+# endif
+		SLAB_NOTRACK)
 
 #define OO_SHIFT	16
 #define OO_MASK		((1 << OO_SHIFT) - 1)
@@ -2544,8 +2547,10 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
 	if (order)
 		s->allocflags |= __GFP_COMP;
 
+#ifdef CONFIG_ZONE_DMA
 	if (s->flags & SLAB_CACHE_DMA)
 		s->allocflags |= SLUB_DMA;
+#endif
 
 	if (s->flags & SLAB_RECLAIM_ACCOUNT)
 		s->allocflags |= __GFP_RECLAIMABLE;
@@ -4651,8 +4656,10 @@ static char *create_unique_id(struct kmem_cache *s)
 	 * are matched during merging to guarantee that the id is
 	 * unique.
 	 */
+#ifdef CONFIG_ZONE_DMA
 	if (s->flags & SLAB_CACHE_DMA)
 		*p++ = 'd';
+#endif
 	if (s->flags & SLAB_RECLAIM_ACCOUNT)
 		*p++ = 'a';
 	if (s->flags & SLAB_DEBUG_FREE)
--
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