1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index bf297b03a4e4..16ea3374dddf 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -67,6 +67,12 @@ struct clocksource {
         unsigned long flags;
         cycle_t (*vread)(void);
         void (*resume)(void);
+#ifdef CONFIG_IA64
+        void *fsys_mmio;        /* used by fsyscall asm code */
+#define CLKSRC_FSYS_MMIO_SET(mmio, addr)      ((mmio) = (addr))
+#else
+#define CLKSRC_FSYS_MMIO_SET(mmio, addr)      do { } while (0)
+#endif
 
         /* timekeeping specific data, ignore */
         cycle_t cycle_interval;