Slab allocators: remove useless __GFP_NO_GROW flag

There is no user remaining and I have never seen any use of that flag.

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>

include/linux/gfp.h

@@ -40,7 +40,6 @@ struct vm_area_struct;
 #define __GFP_REPEAT	((__force gfp_t)0x400u)	/* Retry the allocation.  Might fail */
 #define __GFP_NOFAIL	((__force gfp_t)0x800u)	/* Retry for ever.  Cannot fail */
 #define __GFP_NORETRY	((__force gfp_t)0x1000u)/* Do not retry.  Might fail */
-#define __GFP_NO_GROW	((__force gfp_t)0x2000u)/* Slab internal usage */
 #define __GFP_COMP	((__force gfp_t)0x4000u)/* Add compound page metadata */
 #define __GFP_ZERO	((__force gfp_t)0x8000u)/* Return zeroed page on success */
 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
@@ -53,7 +52,7 @@ struct vm_area_struct;
 /* if you forget to add the bitmask here kernel will crash, period */
 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
 			__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
-			__GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
+			__GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \
 			__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE)
 
 /* This equals 0, but use constants in case they ever change */

mm/slab.c

@@ -2746,9 +2746,7 @@ static int cache_grow(struct kmem_cache *cachep,
 	 * Be lazy and only check for valid flags here,  keeping it out of the
 	 * critical path in kmem_cache_alloc().
 	 */
-	BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK | __GFP_NO_GROW));
-	if (flags & __GFP_NO_GROW)
-		return 0;
+	BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK));
 
 	ctor_flags = SLAB_CTOR_CONSTRUCTOR;
 	local_flags = (flags & GFP_LEVEL_MASK);
@@ -3252,7 +3250,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
 					flags | GFP_THISNODE, nid);
 	}
 
-	if (!obj && !(flags & __GFP_NO_GROW)) {
+	if (!obj) {
 		/*
 		 * This allocation will be performed within the constraints
 		 * of the current cpuset / memory policy requirements.

mm/slub.c

@@ -815,9 +815,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
 	void *last;
 	void *p;
 
-	if (flags & __GFP_NO_GROW)
-		return NULL;
-
 	BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK));
 
 	if (flags & __GFP_WAIT)