`batman_adv: Unknown symbol cfg80211_get_station` - ath79, 4.14.67

Seen booting ath79 from today's master on Archer C7 v2 -- 4.14.67 (first ath79 boot, so history unknown)

2018 Sep  2 18:39:43 devel warning kernel: [   35.039433] batman_adv: Unknown symbol cfg80211_get_station (err 0)

batman-adv seems to be working, but I don't see this warning on my ar71xx builds 4.9.124.

Anyone else seen anything similar?

Checking make menuconfig for the ath79 build shows

    -*- kmod-cfg80211...................... cfg80211 - wireless configuration API 

and the module is loaded

cfg80211              225700  7 ath9k,ath9k_htc,ath9k_common,batman_adv,ath10k_core,ath,mac80211

and the symbol looks like its there when the system comes up and is interactive

$ sudo cat /proc/kallsyms | fgrep cfg80211_get_station
87683dc0 T cfg80211_get_station	[cfg80211]

I'm booting my ath79 WNDR3700 to double check (don't have batman on it). I just built with kallsyms enabled and I'm getting this. For me, batman-adv doesn't even compile on master?

root@OpenWrt:~# uname -a
Linux OpenWrt 4.14.67 #0 Mon Sep 3 11:04:08 2018 mips GNU/Linux
root@OpenWrt:~# fgrep cfg80211_get_station /proc/kallsyms 
83383dc0 T cfg80211_get_station	[cfg80211]
root@OpenWrt:~# dmesg |grep 80211
[   50.735923] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   50.738893] ieee80211 phy0: Atheros AR9280 Rev:2 mem=0xb0000000, irq=13
[   65.260369] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   65.263353] ieee80211 phy1: Atheros AR9280 Rev:2 mem=0xb0010000, irq=14