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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-01-16 00:54:53 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-01-19 15:27:49 +0100
commit51164251f5c35e6596130ef0de94ffe65fe441e0 (patch)
tree914eeadf8095d4fad848451c7928c80ddb17166a /drivers/cpuidle
parent10475b34f4d71cf71cfe7c5d1f27d8ff3a4eb9bc (diff)
downloadlinux-51164251f5c35e6596130ef0de94ffe65fe441e0.tar.bz2
sched / idle: Drop default_idle_call() fallback from call_cpuidle()
After commit 9c4b2867ed7c (cpuidle: menu: Fix menu_select() for CPUIDLE_DRIVER_STATE_START == 0) it is clear that menu_select() cannot return negative values. Moreover, ladder_select_state() will never return a negative value too, so make find_deepest_state() return non-negative values too and drop the default_idle_call() fallback from call_cpuidle(). This eliminates one branch from the idle loop and makes the governors and find_deepest_state() handle the case when all states have been disabled from sysfs consistently. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 17a6dc0e2111..046423b0c5ca 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -79,9 +79,9 @@ static int find_deepest_state(struct cpuidle_driver *drv,
bool freeze)
{
unsigned int latency_req = 0;
- int i, ret = -ENXIO;
+ int i, ret = 0;
- for (i = 0; i < drv->state_count; i++) {
+ for (i = 1; i < drv->state_count; i++) {
struct cpuidle_state *s = &drv->states[i];
struct cpuidle_state_usage *su = &dev->states_usage[i];
@@ -243,7 +243,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
* @drv: the cpuidle driver
* @dev: the cpuidle device
*
- * Returns the index of the idle state.
+ * Returns the index of the idle state. The return value must not be negative.
*/
int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{