Index: sys/dev/mlx4/mlx4_ib/mlx4_ib_sysfs.c
===================================================================
--- sys/dev/mlx4/mlx4_ib/mlx4_ib_sysfs.c
+++ sys/dev/mlx4/mlx4_ib/mlx4_ib_sysfs.c
@@ -35,6 +35,7 @@
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/fs.h>
+#include <machine/_inttypes.h>
 
 #include <rdma/ib_mad.h>
 /*show_admin_alias_guid returns the administratively assigned value of that GUID.
@@ -87,7 +88,7 @@
 		pr_err("GUID 0 block 0 is RO\n");
 		return count;
 	}
-	sscanf(buf, "%llx", &sysadmin_ag_val);
+	sscanf(buf, "%" SCNx64, &sysadmin_ag_val);
 	*(__be64 *)&mdev->sriov.alias_guid.ports_guid[port->num - 1].
 		all_rec_per_port[record_num].
 		all_recs[GUID_REC_SIZE * guid_index_in_rec] =