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[CPUFREQ] Warn when cpufreq_register_notifier called before pure initcalls

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If cpufreq_register_notifier is called before pure initcalls,
init_cpufreq_transition_notifier_list will overwrite whatever it did,
causing notifiers to be ignored.

Print some noise to the kernel log if that happens.

Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Dave Jones <davej@codemonkey.org.uk>
This commit is contained in:
Cesar Eduardo Barros 2008-02-16 08:41:24 -02:00 committed by Dave Jones
parent 4570911811
commit 74212ca432
1 changed files with 4 additions and 0 deletions
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4
drivers/cpufreq/cpufreq.c
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@ -118,9 +118,11 @@ static void handle_update(struct work_struct *work);
static BLOCKING_NOTIFIER_HEAD(cpufreq_policy_notifier_list);
static struct srcu_notifier_head 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);
@ -1367,6 +1369,8 @@ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
{
int ret;
WARN_ON(!init_cpufreq_transition_notifier_list_called);
switch (list) {
case CPUFREQ_TRANSITION_NOTIFIER:
ret = srcu_notifier_chain_register(