path_lookup in net/mac80211/mesh_pathtbl.c consolidates with 
path_lookup in include/linux/namei.h used in old kernel versions.

--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -18,6 +18,8 @@
 #include "ieee80211_i.h"
 #include "mesh.h"
 
+#define path_lookup general_path_lookup
+
 #ifdef CONFIG_MAC80211_VERBOSE_MPATH_DEBUG
 #define mpath_dbg(fmt, args...)	printk(KERN_DEBUG fmt, ##args)
 #else