[patch 3/3] futex_compat: update to match native version

[arnd@arndb.de]

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A few changes have gone into the futex code but not into
the futex_compat code, the most significant one being a
fix for FUTEX_WAKE_OP in commit
f54f098612d7f86463b5fb4763d03533d634de73.

This brings both versions in sync again.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Index: linux-2.6/kernel/futex_compat.c
===================================================================
--- linux-2.6.orig/kernel/futex_compat.c
+++ linux-2.6/kernel/futex_compat.c
@@ -62,8 +62,10 @@ void compat_exit_robust_list(struct task
 	 */
 	if (fetch_robust_entry(&pending, &head->list_op_pending, &pip))
 		return;
+
 	if (pending)
-		handle_futex_death((void __user *)pending + futex_offset, curr, pip);
+		handle_futex_death((void __user *)pending + futex_offset,
+				   curr, pip);
 
 	while (entry != &head->list) {
 		/*
@@ -142,7 +144,7 @@ asmlinkage long compat_sys_futex(u32 __u
 {
 	struct timespec ts;
 	ktime_t t, *tp = NULL;
-	int val2 = 0;
+	u32 val2 = 0;
 	int cmd = op & FUTEX_CMD_MASK;
 
 	if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI)) {
@@ -156,8 +158,13 @@ asmlinkage long compat_sys_futex(u32 __u
 			t = ktime_add(ktime_get(), t);
 		tp = &t;
 	}
-	if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE)
-		val2 = (int) (unsigned long) utime;
+	/*
+	 * requeue parameter in 'utime' if cmd == FUTEX_REQUEUE.
+	 * number of waiters to wake in 'utime' if cmd == FUTEX_WAKE_OP.
+	 */
+	if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE ||
+	    cmd == FUTEX_WAKE_OP)
+		val2 = (u32) (unsigned long) utime;
 
 	return do_futex(uaddr, op, val, tp, uaddr2, val2, val3);
 }

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