[patch 6/6] slab: only define SLAB_CACHE_DMA for CONFIG_ZONE_DMA

[David Rientjes]

Only define SLAB_CACHE_DMA support if CONFIG_ZONE_DMA is enabled.  This
catches build errors when used on an invalid configuration.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 include/linux/slab.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -20,7 +20,9 @@
 #define SLAB_RED_ZONE		0x00000400UL	/* DEBUG: Red zone objs in a cache */
 #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 */
+#ifdef CONFIG_ZONE_DMA
+# define SLAB_CACHE_DMA		0x00004000UL	/* Use GFP_DMA memory */
+#endif
 #define SLAB_STORE_USER		0x00010000UL	/* DEBUG: Store the last owner for bug hunting */
 #define SLAB_PANIC		0x00040000UL	/* Panic if kmem_cache_create() fails */
 /*
--
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