[PATCH] Fix slab-vs-gfp bitflag clash

Fixes a bug spotted by Alexey Mahotkin <alexm@hsys.msk.ru>: the slab-internal
SLAB_NO_GROW bit clashes with __GFP_NORETRY.

Fix that up so it won't happen again by moving the bit layout into gfp.h.

include/linux/gfp.h

@@ -31,6 +31,7 @@
 #define __GFP_REPEAT	0x400	/* Retry the allocation.  Might fail */
 #define __GFP_NOFAIL	0x800	/* Retry for ever.  Cannot fail */
 #define __GFP_NORETRY	0x1000	/* Do not retry.  Might fail */
+#define __GFP_NO_GROW	0x2000	/* Slab internal usage */
 
 #define GFP_ATOMIC	(__GFP_HIGH)
 #define GFP_NOIO	(__GFP_WAIT)

include/linux/slab.h

@@ -22,8 +22,11 @@ typedef struct kmem_cache_s kmem_cache_t;
 #define	SLAB_KERNEL		GFP_KERNEL
 #define	SLAB_DMA		GFP_DMA
 
-#define SLAB_LEVEL_MASK		(__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|__GFP_NORETRY)
-#define	SLAB_NO_GROW		0x00001000UL	/* don't grow a cache */
+#define SLAB_LEVEL_MASK		(__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
+				__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT|\
+				__GFP_NOFAIL|__GFP_NORETRY)
+
+#define	SLAB_NO_GROW		__GFP_NO_GROW	/* don't grow a cache */
 
 /* flags to pass to kmem_cache_create().
  * The first 3 are only valid when the allocator as been build