I'll weigh in here: I maintain the corresponding driver for ArchLinux; at Arch,
the default kernel is pretty much "plain vanilla", and it suffers from this
very same problem, since CONFIG_PREEMPT_RCU is on by default.
I've been hoping for a resolution to this problem since March, as it has
affected Arch since kernel 3.8 and the changes it prompted to this driver at
that time (introducing the calls to rcu_read_lock/unlock in the driver).
For a while, I was under the impression that this problem had been fixed
for Ubuntu / low latency, and had been scratching my head to find out
how, but I guess I am on the wrong track: it is still a problem on
Ubuntu as well.
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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']
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