[PATCH] lightweight robust futexes updates

- fix: initialize the robust list(s) to NULL in copy_process.

- doc update

- cleanup: rename _inuser to _inatomic

- __user cleanups and other small cleanups

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/futex_compat.c

@@ -121,9 +121,9 @@ err_unlock:
 	return ret;
 }
 
-asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
+asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 		struct compat_timespec __user *utime, u32 __user *uaddr2,
-		int val3)
+		u32 val3)
 {
 	struct timespec t;
 	unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
@@ -137,6 +137,5 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val,
 	if (op >= FUTEX_REQUEUE)
 		val2 = (int) (unsigned long) utime;
 
-	return do_futex((unsigned long)uaddr, op, val, timeout,
-			(unsigned long)uaddr2, val2, val3);
+	return do_futex(uaddr, op, val, timeout, uaddr2, val2, val3);
 }