Messages in this thread Patch in this message | | | From | Viresh Kumar <> | Subject | [PATCH 20/21] cpuidle: don't calculate time-diff if entered_state == 0 | Date | Sun, 22 Sep 2013 06:51:12 +0530 |
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If entered_state == 0, we don't need to set dev->last_residency to 'diff' as we will be setting it to zero without using its new value.
And so move calculation of diff also inside the "if" statement.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> --- drivers/cpuidle/cpuidle.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index bf80236..cb81689 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -77,23 +77,22 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, struct cpuidle_state *target_state = &drv->states[index]; ktime_t time_start, time_end; - s64 diff; time_start = ktime_get(); entered_state = target_state->enter(dev, drv, index); - time_end = ktime_get(); + if (entered_state >= 0) { + s64 diff; - local_irq_enable(); + time_end = ktime_get(); + diff = ktime_to_us(ktime_sub(time_end, time_start)); - diff = ktime_to_us(ktime_sub(time_end, time_start)); - if (diff > INT_MAX) - diff = INT_MAX; + if (diff > INT_MAX) + diff = INT_MAX; - dev->last_residency = (int) diff; + dev->last_residency = (int) diff; - if (entered_state >= 0) { /* Update cpuidle counters */ /* This can be moved to within driver enter routine * but that results in multiple copies of same code. @@ -104,6 +103,8 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, dev->last_residency = 0; } + local_irq_enable(); + return entered_state; } -- 1.7.12.rc2.18.g61b472e
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