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ACPI: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion

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acpi_enter_[simple,bm] does
idle timing in ns, convert it to timeval, then to us, then to
pmtimer_ticks and then back to ns.

This patch changes things to
idle timing in ns, convert it to us, and then to pmtimer_ticks.

Just saves an imul along this path, but makes the code cleaner.

Signed-off-by: Venkatesh Pallipadi <venki@google.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi 2010-04-22 16:48:33 -07:00 committed by Len Brown
parent 34a18d6fe5
commit 2da513f582
1 changed files with 10 additions and 4 deletions
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14
drivers/acpi/processor_idle.c
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@ -859,6 +859,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
ktime_t kt1, kt2;
s64 idle_time_ns;
s64 idle_time;
s64 sleep_ticks = 0;
@ -900,12 +901,14 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
sched_clock_idle_sleep_event();
acpi_idle_do_entry(cx);
kt2 = ktime_get_real();
idle_time = ktime_to_us(ktime_sub(kt2, kt1));
idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1));
idle_time = idle_time_ns;
do_div(idle_time, NSEC_PER_USEC);
sleep_ticks = us_to_pm_timer_ticks(idle_time);
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
sched_clock_idle_wakeup_event(idle_time_ns);
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
@ -933,6 +936,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
ktime_t kt1, kt2;
s64 idle_time_ns;
s64 idle_time;
s64 sleep_ticks = 0;
@ -1015,11 +1019,13 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
spin_unlock(&c3_lock);
}
kt2 = ktime_get_real();
idle_time = ktime_to_us(ktime_sub(kt2, kt1));
idle_time_ns = ktime_to_us(ktime_sub(kt2, kt1));
idle_time = idle_time_ns;
do_div(idle_time, NSEC_PER_USEC);
sleep_ticks = us_to_pm_timer_ticks(idle_time);
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
sched_clock_idle_wakeup_event(idle_time_ns);
local_irq_enable();
current_thread_info()->status |= TS_POLLING;