[PATCH] lightweight robust futexes updates 2

futex.h updates:

- get rid of FUTEX_OWNER_PENDING - it's not used
- reduce ROBUST_LIST_LIMIT to a saner value

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/futex.h

@@ -79,22 +79,16 @@ struct robust_list_head {
  */
 #define FUTEX_OWNER_DIED	0x40000000
 
-/*
- * Reserved bit:
- */
-#define FUTEX_OWNER_PENDING	0x20000000
-
 /*
  * The rest of the robust-futex field is for the TID:
  */
-#define FUTEX_TID_MASK		0x1fffffff
+#define FUTEX_TID_MASK		0x3fffffff
 
 /*
- * A limit of one million locks held per thread (!) ought to be enough
- * for some time. This also protects against a deliberately circular
- * list. Not worth introducing an rlimit for this:
+ * This limit protects against a deliberately circular list.
+ * (Not worth introducing an rlimit for it)
  */
-#define ROBUST_LIST_LIMIT	1048576
+#define ROBUST_LIST_LIMIT	2048
 
 long do_futex(unsigned long uaddr, int op, int val,
 		unsigned long timeout, unsigned long uaddr2, int val2,