On 10/28/2014 03:01 AM, Len Brown wrote:
On Thu, Oct 23, 2014 at 5:01 AM, Daniel Lezcano
<daniel.lezc...@linaro.org> wrote:
In the current code, the check to reflect or not the outcoming state is done
against the idle state which has been chosen and its value.
Instead of doing a check in each of the reflect functions, just don't call
reflect
if something went wrong in the idle path.
Signed-off-by: Daniel Lezcano <daniel.lezc...@linaro.org>
Acked-by: Nicolas Pitre <n...@linaro.org>
---
drivers/cpuidle/governors/ladder.c | 3 +--
drivers/cpuidle/governors/menu.c | 4 +---
kernel/sched/idle.c | 3 ++-
3 files changed, 4 insertions(+), 6 deletions(-)
diff --git a/drivers/cpuidle/governors/ladder.c
b/drivers/cpuidle/governors/ladder.c
index fb396d6..c0b36a8 100644
--- a/drivers/cpuidle/governors/ladder.c
+++ b/drivers/cpuidle/governors/ladder.c
@@ -165,8 +165,7 @@ static int ladder_enable_device(struct cpuidle_driver *drv,
static void ladder_reflect(struct cpuidle_device *dev, int index)
{
struct ladder_device *ldev = &__get_cpu_var(ladder_devices);
- if (index > 0)
- ldev->last_state_idx = index;
Before this patch, last_state_idx was never set to 0 here.
After this patch, last_state_idx will be set to 0 when entered_state is 0.
Is that okay?
Yes, I think so because the state zero won't be never selected on x86
but on the other arch it will. So before this patch, on the other archs,
the state 0 was never reflected as it should do.
This is resulting from the CPUIDLE_DRIVER_STATE_START macro (I hope I
can kill this macro in a couple of patchset after this one).
+ ldev->last_state_idx = index;
}
static struct cpuidle_governor ladder_governor = {
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index a17515f..3907301 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -365,9 +365,7 @@ static int menu_select(struct cpuidle_driver *drv, struct
cpuidle_device *dev,
static void menu_reflect(struct cpuidle_device *dev, int index)
{
struct menu_device *data = &__get_cpu_var(menu_devices);
- data->last_state_idx = index;
- if (index >= 0)
- data->needs_update = 1;
+ data->needs_update = 1;
}
/**
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 58c7522..49dcc7d 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -162,7 +162,8 @@ use_default:
/*
* Give the governor an opportunity to reflect on the outcome
*/
- cpuidle_reflect(dev, entered_state);
+ if (entered_state >= 0)
+ cpuidle_reflect(dev, entered_state);
exit_idle:
__current_set_polling();
--
1.9.1
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