Tested with Clang 3.7.1, GCC 4.2.1 (from 9.3-RELEASE) and 4.9.4 (with -fstack-usage flag)
Stats from GCC 4.9.4:
ieee80211_ioctl.c:254:1:get_scan_space 8 static
ieee80211_ioctl.c:755:1:dummy_ioctl_get 4 static
ieee80211_ioctl.c:1830:1:findchannel 48 static
ieee80211_ioctl.c:2577:1:dummy_ioctl_set 4 static
ieee80211_ioctl.c:263:1:get_scan_result 64 dynamic,bounded
ieee80211_ioctl.c:377:1:get_sta_info 56 dynamic,bounded
ieee80211_ioctl.c:2404:1:ieee80211_scanreq 72 dynamic,bounded
ieee80211_ioctl.c:363:1:get_sta_space 4 static
ieee80211_ioctl.c:622:1:getappie.isra.8 24 dynamic,bounded
ieee80211_ioctl.c:2222:1:setappie.isra.17 40 dynamic,bounded
ieee80211_ioctl.c:1492:1:mlmelookup 24 dynamic,bounded
ieee80211_ioctl.c:1916:1:setcurchan 32 dynamic,bounded
ieee80211_ioctl.c:1251:1:mlmedebug 28 dynamic,bounded
ieee80211_ioctl.c:1292:1:domlme 24 dynamic,bounded
ieee80211_ioctl.c:3292:1:ieee80211_ioctl 188 dynamic,bounded