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authorLen Brown <len.brown@intel.com>2014-12-16 09:52:08 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-12-17 04:26:28 +0300
commit62c4cf97e82cf79446642e599d155884f600cf17 (patch)
tree489351bd5d2f5df2913c5877be886e57b092425f /include/linux/cpuidle.h
parentb73026b9c959600bcd65eeae7a5f7ac00ded886f (diff)
downloadlinux-62c4cf97e82cf79446642e599d155884f600cf17.tar.xz
cpuidle / ACPI: remove unused CPUIDLE_FLAG_TIME_INVALID
CPUIDLE_FLAG_TIME_INVALID is no longer checked by menu or ladder cpuidle governors, so don't bother setting or defining it. It was originally invented to account for the fact that acpi_safe_halt() enables interrupts to invoke HLT. That would allow interrupt service routines to be included in the last_idle duration measurements made in cpuidle_enter_state(), potentially returning a duration much larger than reality. But menu and ladder can gracefully handle erroneously large duration intervals without checking for CPUIDLE_FLAG_TIME_INVALID. Further, if they don't check CPUIDLE_FLAG_TIME_INVALID, they can also benefit from the instances when the duration interval is not erroneously large. Signed-off-by: Len Brown <len.brown@intel.com> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/cpuidle.h')
-rw-r--r--include/linux/cpuidle.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h
index a07e087f54b2..ab70f3bc44ad 100644
--- a/include/linux/cpuidle.h
+++ b/include/linux/cpuidle.h
@@ -53,7 +53,6 @@ struct cpuidle_state {
};
/* Idle State Flags */
-#define CPUIDLE_FLAG_TIME_INVALID (0x01) /* is residency time measurable? */
#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */
#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */
@@ -89,8 +88,6 @@ DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev);
/**
* cpuidle_get_last_residency - retrieves the last state's residency time
* @dev: the target CPU
- *
- * NOTE: this value is invalid if CPUIDLE_FLAG_TIME_INVALID is set
*/
static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
{