DKMS make.log for bcmwl-6.20.155.1+bdcom for kernel 3.8.0-30-lowlatency (i686)
Sat Sep  7 11:32:01 CDT 2013
make: Entering directory `/usr/src/linux-headers-3.8.0-30-lowlatency'
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  LD      /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/built-in.o
  CC [M]  /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/shared/linux_osl.o
  CC [M]  /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_linux.o
  CC [M]  /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_iw.o
  CC [M]  /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_cfg80211.o
/var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_cfg80211.c:1578:2: warning: initialization from incompatible pointer type [enabled by default]
/var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_cfg80211.c:1578:2: warning: (near initialization for ‘wl_cfg80211_ops.set_tx_power’) [enabled by default]
/var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_cfg80211.c:1579:2: warning: initialization from incompatible pointer type [enabled by default]
/var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/src/wl/sys/wl_cfg80211.c:1579:2: warning: (near initialization for ‘wl_cfg80211_ops.get_tx_power’) [enabled by default]
  LD [M]  /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/wl.o
  Building modules, stage 2.
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  MODPOST 1 modules
FATAL: modpost: GPL-incompatible module wl.ko uses GPL-only symbol '__rcu_read_unlock'
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
make: Leaving directory `/usr/src/linux-headers-3.8.0-30-lowlatency'