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[Brian Burch <1156138@xxxxxxxxxxxxxxxxxx>]

It looks if events are preceeding me, but here is what I've found so
far:

1. The earlier comments about using a custom kernel are just a red
herring. I build a custom kernel using the standard lowlatency
configuration and (not surprisingly) the bcmwl dkms module failed to
compile.

2. A diff between the distro /boot/config-3.8.0-27-lowlatency and
config-3.8.0-27-generic shows VERY few changes, mainly PREEMPT stuff and
(probably) consequential LOCK variables - see attachment for full diff.

3. I built my custom kernel from the distro source package, not git. I
intend to hack the patch proposed in
https://bugs.launchpad.net/ubuntu/+source/linux-lowlatency/+bug/1154036
(posted in march 2013!!) and try to apply it to my kernel source.

** Patch added: "diff between lowlatency and generic configs"
   https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1156138/+attachment/3759028/+files/config-standard.diff

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https://bugs.launchpad.net/bugs/1156138

Title:
  bcmwl-kernel-source fails to build on lowlatency kernel [FATAL:
  modpost: GPL-incompatible module wl.ko uses GPL-only symbol
  '__rcu_read_unlock']

Status in “bcmwl” package in Ubuntu:
  Confirmed

Bug description:
  Ubuntu 13.04

  ProblemType: Package
  DistroRelease: Ubuntu 13.04
  Package: bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6
  ProcVersionSignature: Ubuntu 3.8.0-13.22-generic 3.8.3
  Uname: Linux 3.8.0-13-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.9.1-0ubuntu1
  Architecture: i386
  DKMSKernelVersion: 3.8.0-12-lowlatency
  Date: Sat Mar 16 23:37:03 2013
  InstallationDate: Installed on 2013-01-03 (72 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  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 2013-03-12 (4 days ago)

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