commit ad7722dab7292dbc1c4586d701ac226b68122d39
author viresh kumar <viresh.kumar@linaro.org> Fri Oct 18 19:10:15 2013 +0530
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> Fri Oct 25 23:54:12 2013 +0200
tree 9d66845a9e2f1fbb6c2641d30f89f164724a5f76
parent 19e77c28dbf1972305da0dfeb92a62f83df3a91d

cpufreq: create per policy rwsem instead of per CPU cpu_policy_rwsem

We have per-CPU cpu_policy_rwsem for cpufreq core, but we never use
all of them. We always use rwsem of policy->cpu and so we can
actually make this rwsem per policy instead.

This patch does this change. With this change other tricky situations
are also avoided now, like which lock to take while we are changing
policy->cpu, etc.

Suggested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>