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Title:
  bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6: bcmwl kernel module
  failed to build

Status in “bcmwl” package in Ubuntu:
  New

Bug description:
  Trying to install linux-lowlatency package on a MacBookPro with ubuntu
  13.04, synaptic reports:

  run-parts: executing /etc/kernel/header_postinst.d/dkms 3.8.0-30-lowlatency /boot/vmlinuz-3.8.0-30-lowlatency
  Error! Bad return status for module build on kernel: 3.8.0-30-lowlatency (x86_64)
  Consult /var/lib/dkms/bcmwl/6.20.155.1+bdcom/build/make.log for more information.

  Looking at make.log says:

  DKMS make.log for bcmwl-6.20.155.1+bdcom for kernel 3.8.0-30-lowlatency (x86_64)
  Sun Sep 15 18:30:16 CEST 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'

  So apparently this is the culprit on the lowlatency kernel:

  FATAL: modpost: GPL-incompatible module wl.ko uses GPL-only symbol
  '__rcu_read_unlock'

  best,
  -mario

  ProblemType: Package
  DistroRelease: Ubuntu 13.04
  Package: bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.9.2-0ubuntu8.4
  Architecture: amd64
  DKMSKernelVersion: 3.8.0-30-lowlatency
  Date: Sun Sep 15 18:29:36 2013
  InstallationDate: Installed on 2012-04-23 (510 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64+mac (20120421)
  MarkForUpload: True
  PackageVersion: 6.20.155.1+bdcom-0ubuntu6
  SourcePackage: bcmwl
  Title: bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6: bcmwl kernel module failed to build
  UpgradeStatus: Upgraded to raring on 2013-04-30 (138 days ago)

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