cpuidle: simplify multiple driver support

Commit bf4d1b5 (cpuidle: support multiple drivers) introduced support
for using multiple cpuidle drivers at the same time.  It added a
couple of new APIs to register the driver per CPU, but that led to
some unnecessary code complexity related to the kernel config options
deciding whether or not the multiple driver support is enabled.  The
code has to work as it did before when the multiple driver support is
not enabled and the multiple driver support has to be compatible with
the previously existing API.

Remove the new API, not used by any driver in the tree yet (but
needed for the HMP cpuidle drivers that will be submitted soon), and
add a new cpumask pointer to the cpuidle driver structure that will
point to the mask of CPUs handled by the given driver.  That will
allow the cpuidle_[un]register_driver() API to be used for the
multiple driver support along with the cpuidle_[un]register()
functions added recently.

[rjw: Changelog]
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 8f04062..0bc4b74 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -111,6 +111,9 @@ struct cpuidle_driver {
 	struct cpuidle_state	states[CPUIDLE_STATE_MAX];
 	int			state_count;
 	int			safe_state_index;
+
+	/* the driver handles the cpus in cpumask */
+	struct cpumask       *cpumask;
 };
 
 #ifdef CONFIG_CPU_IDLE
@@ -135,9 +138,6 @@ extern void cpuidle_disable_device(struct cpuidle_device *dev);
 extern int cpuidle_play_dead(void);
 
 extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev);
-extern int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu);
-extern void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu);
-
 #else
 static inline void disable_cpuidle(void) { }
 static inline int cpuidle_idle_call(void) { return -ENODEV; }