[IA64] constify function pointer tables

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 5ae177f..48e5609 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -5795,7 +5795,7 @@
 	return 0;
 }
 
-struct seq_operations pfm_seq_ops = {
+const struct seq_operations pfm_seq_ops = {
 	.start =	pfm_proc_start,
  	.next =		pfm_proc_next,
  	.stop =		pfm_proc_stop,