1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 0c51a4de67a8..892b49f14f5f 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -16,6 +16,7 @@
 #include <linux/errno.h>
 #include <linux/time.h>
 #include <linux/signal.h>
+#include <linux/sched.h>	/* for MAX_SCHEDULE_TIMEOUT */
 
 #include <asm/uaccess.h>
 
@@ -208,3 +209,19 @@ asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t *set,
 		ret = put_user(s, oset);
 	return ret;
 }
+
+extern long do_futex(u32 *, int, int, unsigned long);
+
+asmlinkage long compat_sys_futex(u32 *uaddr, int op, int val,
+		struct compat_timespec *utime)
+{
+	struct timespec t;
+	unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
+
+	if ((op == FUTEX_WAIT) && utime) {
+		if (get_compat_timespec(&t, utime))
+			return -EFAULT;
+		timeout = timespec_to_jiffies(t) + 1;
+	}
+	return do_futex((unsigned long)uaddr, op, val, timeout);
+}