The governors are defined as module in the code, but the Kconfig options do not
allow to compile them as module. This is not really a problem but the init
order is: the cpuidle init functions (framework and driver) and then the
governors. That leads to some weirdness in the cpuidle framework because the
function cpuidle_register_device calls cpuidle_enable_device which in turns
fails at the first attempt because no governor is registered. When the
governor is registered, the framework calls cpuidle_enable_device again which
will invoke the __cpuidle_register_device function. Of course, in order to make
this to work, the return code of cpuidle_enable_device is not checked by the
caller in cpuidle_register_device.
Instead of having this cyclic call graph and relying on a positive side effect
of the hackish back and forth call to cpuidle_enable_device, let's change the
init order for the governor in order to clean up the cpuidle_enable_device
function.
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/cpuidle/Makefile | 2 +-
drivers/cpuidle/governors/ladder.c | 14 ++------------
drivers/cpuidle/governors/menu.c | 14 ++------------
3 files changed, 5 insertions(+), 25 deletions(-)
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index 0d8bd55..05e2035 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -2,7 +2,7 @@
# Makefile for cpuidle.
#
-obj-y += cpuidle.o driver.o governor.o sysfs.o governors/
+obj-y += governors/ cpuidle.o driver.o governor.o sysfs.o
obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
obj-$(CONFIG_CPU_IDLE_CALXEDA) += cpuidle-calxeda.o
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c
index 9b78405..928dc59 100644
--- a/drivers/cpuidle/governors/ladder.c
+++ b/drivers/cpuidle/governors/ladder.c
@@ -187,19 +187,9 @@ static struct cpuidle_governor ladder_governor = {
/**
* init_ladder - initializes the governor
*/
-static int __init init_ladder(void)
+static int __init ladder_init(void)
{
return cpuidle_register_governor(&ladder_governor);
}
-/**
- * exit_ladder - exits the governor
- */
-static void __exit exit_ladder(void)
-{
- cpuidle_unregister_governor(&ladder_governor);
-}
-
-MODULE_LICENSE("GPL");
-module_init(init_ladder);
-module_exit(exit_ladder);
+core_initcall(ladder_init);
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index fe343a0..483bac1 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -535,19 +535,9 @@ static struct cpuidle_governor menu_governor = {
/**
* init_menu - initializes the governor
*/
-static int __init init_menu(void)
+static int __init menu_init(void)
{
return cpuidle_register_governor(&menu_governor);
}
-/**
- * exit_menu - exits the governor
- */
-static void __exit exit_menu(void)
-{
- cpuidle_unregister_governor(&menu_governor);
-}
-
-MODULE_LICENSE("GPL");
-module_init(init_menu);
-module_exit(exit_menu);
+core_initcall(menu_init);
--
1.7.9.5
