[CPUFREQ] Warn when cpufreq_register_notifier called before pure initcalls

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index be78c07f72ca..d3575f5ec6d2 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -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(