[2.6.22.2 review 42/84] futex: pass nr_wake2 to futex_wake_op

[Greg KH]

From: Andreas Schwab <schwab@xxxxxxx>

The fourth argument of sys_futex is ignored when op == FUTEX_WAKE_OP,
but futex_wake_op expects it as its nr_wake2 parameter.

The only user of this operation in glibc is always passing 1, so this
bug had no consequences so far.

Signed-off-by: Andreas Schwab <schwab@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Ulrich Drepper <drepper@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 kernel/futex.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2061,8 +2061,10 @@ asmlinkage long sys_futex(u32 __user *ua
 	}
 	/*
 	 * 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)
+	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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