cpufreq: convert cpufreq_driver to using RCU

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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>

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This commit is contained in:

Nathan Zimmer

2013-04-04 14:53:25 +00:00

committed by Rafael J. Wysocki

parent 6eb1c37742

commit 5800043b24

1 changed files with 211 additions and 70 deletions

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drivers/cpufreq/cpufreq.c

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