cpufreq: convert cpufreq_driver to using RCU
authorNathan Zimmer <nzimmer@sgi.com>
Thu, 4 Apr 2013 14:53:25 +0000 (14:53 +0000)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Wed, 10 Apr 2013 11:19:26 +0000 (13:19 +0200)
commit5800043b2488a1c4c6e859af860644d37419d58b
tree87e64e06920fa4483c01363d5b8d59928b0082e5
parent6eb1c377423572374518f5be93214d139d113090
cpufreq: convert cpufreq_driver to using RCU

We eventually would like to remove the rwlock cpufreq_driver_lock or
convert it back to a spinlock and protect the read sections with RCU.
The first step in that direction is to make cpufreq_driver use RCU.
I don't see an easy wasy to protect the cpufreq_cpu_data structure
with RCU, so I am leaving it with the rwlock for now since under
certain configs __cpufreq_cpu_get is a hot spot with 256+ cores.

[rjw: Subject, changelog, white space]
Signed-off-by: Nathan Zimmer <nzimmer@sgi.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/cpufreq/cpufreq.c