Fixup ia64 32-bit register clock cycle read

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch-ia64.h b/arch/arch-ia64.h
index 2df55ba..8e8dd7f 100644
--- a/arch/arch-ia64.h
+++ b/arch/arch-ia64.h
@@ -34,9 +34,9 @@
 	return ia64_popcnt(bitmask & (~bitmask - 1));
 }
 
-static inline unsigned long get_cpu_clock(void)
+static inline unsigned long long get_cpu_clock(void)
 {
-	unsigned long ret;
+	unsigned long long ret;
 
 	__asm__ __volatile__("mov %0=ar.itc" : "=r" (ret) : : "memory");
 	return ret;