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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2024-11-22 21:17:18 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2024-11-22 21:17:18 +0100
commitf3e66e78f2ecb18a55374f7d58030556b751dd79 (patch)
tree4a43cef1908c5bf1a769d8c3d3db3ec3e72747b3
parentbaf4ae80382350ec314f5ce6742c5281a812fe00 (diff)
parent9cf9f2e70bea4e66a2c8b8c4743489beb21258a8 (diff)
Merge branch 'pm-cpuidle'
Merge additional cpuidle changes for 6.13-rc1: - Make cpuidle_play_dead() try all idle states with :enter_dead() callbacks and change their return type to void (Rafael Wysocki). * pm-cpuidle: cpuidle: Change :enter_dead() driver callback return type to void cpuidle: Do not return from cpuidle_play_dead() on callback failures
-rw-r--r--drivers/acpi/processor_idle.c7
-rw-r--r--drivers/cpuidle/cpuidle.c10
-rw-r--r--include/linux/cpuidle.h2
3 files changed, 10 insertions, 9 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 831fa4a12159..ce728cf7e301 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -578,7 +578,7 @@ static void __cpuidle acpi_idle_do_entry(struct acpi_processor_cx *cx)
* @dev: the target CPU
* @index: the index of suggested state
*/
-static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
+static void acpi_idle_play_dead(struct cpuidle_device *dev, int index)
{
struct acpi_processor_cx *cx = per_cpu(acpi_cstate[index], dev->cpu);
@@ -591,11 +591,8 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
io_idle(cx->address);
} else
- return -ENODEV;
+ return;
}
-
- /* Never reached */
- return 0;
}
static __always_inline bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 06ace16f9e71..0835da449db8 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -69,11 +69,15 @@ int cpuidle_play_dead(void)
if (!drv)
return -ENODEV;
- /* Find lowest-power state that supports long-term idle */
- for (i = drv->state_count - 1; i >= 0; i--)
+ for (i = drv->state_count - 1; i >= 0; i--) {
if (drv->states[i].enter_dead)
- return drv->states[i].enter_dead(dev, i);
+ drv->states[i].enter_dead(dev, i);
+ }
+ /*
+ * If :enter_dead() is successful, it will never return, so reaching
+ * here means that all of them failed above or were not present.
+ */
return -ENODEV;
}
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index 3183aeb7f5b4..a9ee4fe55dcf 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -61,7 +61,7 @@ struct cpuidle_state {
struct cpuidle_driver *drv,
int index);
- int (*enter_dead) (struct cpuidle_device *dev, int index);
+ void (*enter_dead) (struct cpuidle_device *dev, int index);
/*
* CPUs execute ->enter_s2idle with the local tick or entire timekeeping