[PATCH] ia64: add ptr_to_compat()

Add ptr_to_compat() to ia64 - needed by the robust-futex code.
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/asm-ia64/compat.h

@@ -189,6 +189,12 @@ compat_ptr (compat_uptr_t uptr)
 	return (void __user *) (unsigned long) uptr;
 }
 
+static inline compat_uptr_t
+ptr_to_compat(void __user *uptr)
+{
+	return (u32)(unsigned long)uptr;
+}
+
 static __inline__ void __user *
 compat_alloc_user_space (long len)
 {