[PATCH] gfp flags annotations - part 1

- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

lib/radix-tree.c

@@ -110,7 +110,7 @@ radix_tree_node_free(struct radix_tree_node *node)
  * success, return zero, with preemption disabled.  On error, return -ENOMEM
  * with preemption not disabled.
  */
-int radix_tree_preload(unsigned int __nocast gfp_mask)
+int radix_tree_preload(gfp_t gfp_mask)
 {
 	struct radix_tree_preload *rtp;
 	struct radix_tree_node *node;