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cpufreq: Use static SRCU initializer

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Use the static SRCU initializer for `cpufreq_transition_notifier_list'.
This avoids the init_cpufreq_transition_notifier_list() initcall. Its
only purpose is to initialize the SRCU notifier once during boot and set
another variable which is used as an indicator whether the init was
perfromed before cpufreq_register_notifier() was used.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sebastian Andrzej Siewior 2018-05-25 12:19:58 +02:00 committed by Rafael J. Wysocki
parent 9c80172b90
commit cc85de361d
1 changed files with 1 additions and 12 deletions
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13
drivers/cpufreq/cpufreq.c
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@ -89,16 +89,7 @@ static void cpufreq_governor_limits(struct cpufreq_policy *policy);
* The mutex locks both lists. * The mutex locks both lists.
*/ */
static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list); static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
static struct srcu_notifier_head cpufreq_transition_notifier_list; SRCU_NOTIFIER_HEAD_STATIC(cpufreq_transition_notifier_list);
static bool init_cpufreq_transition_notifier_list_called;
static int __init init_cpufreq_transition_notifier_list(void)
{
srcu_init_notifier_head(&cpufreq_transition_notifier_list);
init_cpufreq_transition_notifier_list_called = true;
return 0;
}
pure_initcall(init_cpufreq_transition_notifier_list);
static int off __read_mostly; static int off __read_mostly;
static int cpufreq_disabled(void) static int cpufreq_disabled(void)
@ -1767,8 +1758,6 @@ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
if (cpufreq_disabled()) if (cpufreq_disabled())
return -EINVAL; return -EINVAL;
WARN_ON(!init_cpufreq_transition_notifier_list_called);
switch (list) { switch (list) {
case CPUFREQ_TRANSITION_NOTIFIER: case CPUFREQ_TRANSITION_NOTIFIER:
mutex_lock(&cpufreq_fast_switch_lock); mutex_lock(&cpufreq_fast_switch_lock);