diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index b1870a6c..e6854f5 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -102,7 +102,9 @@
 	cookie->netfs_data	= netfs_data;
 	cookie->flags		= 0;
 
-	INIT_RADIX_TREE(&cookie->stores, GFP_NOFS);
+	/* radix tree insertion won't use the preallocation pool unless it's
+	 * told it may not wait */
+	INIT_RADIX_TREE(&cookie->stores, GFP_NOFS & ~__GFP_WAIT);
 
 	switch (cookie->def->type) {
 	case FSCACHE_COOKIE_TYPE_INDEX:
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 23abbd9..ae61068 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -200,6 +200,9 @@
  * ensure that the addition of a single element in the tree cannot fail.  On
  * success, return zero, with preemption disabled.  On error, return -ENOMEM
  * with preemption not disabled.
+ *
+ * To make use of this facility, the radix tree must be initialised without
+ * __GFP_WAIT being passed to INIT_RADIX_TREE().
  */
 int radix_tree_preload(gfp_t gfp_mask)
 {