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authorLen Brown <len.brown@intel.com>2014-12-16 07:52:08 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-12-17 02:26:28 +0100
commit62c4cf97e82cf79446642e599d155884f600cf17 (patch)
tree489351bd5d2f5df2913c5877be886e57b092425f /drivers/acpi/processor_idle.c
parentcpuidle: ladder: Better idle duration measurement without using CPUIDLE_FLAG_... (diff)
downloadlinux-62c4cf97e82cf79446642e599d155884f600cf17.tar.xz
linux-62c4cf97e82cf79446642e599d155884f600cf17.zip
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 'drivers/acpi/processor_idle.c')
-rw-r--r--drivers/acpi/processor_idle.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 380b4b43f361..7afba40e350e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -985,8 +985,6 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
state->flags = 0;
switch (cx->type) {
case ACPI_STATE_C1:
- if (cx->entry_method != ACPI_CSTATE_FFH)
- state->flags |= CPUIDLE_FLAG_TIME_INVALID;
state->enter = acpi_idle_enter_c1;
state->enter_dead = acpi_idle_play_dead;