The commit 8e92b6605d introduced the TIME_VALID flag for the C1 state if this one is a mwait state assuming the interrupt will be enabled before reading the end time of the idle state.
The changelog of this commit mention a potential problem with the menu governor but not a real observation and I assume it described an old code as the commit is from 2008.
I have been digging through the code and I didn't find any place where the interrupts are enabled before reading the time. Moreover with the changes in the meantime, we moved the time measurements in the cpuidle core as well as the interrupts enabling making sure the time is measured before the interrupt are enabled again in a single place.
Remove this test as the time measurement is always valid for this state.
Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org --- drivers/acpi/processor_idle.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 380b4b4..7afba40 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;