2019-01-09 17:25:17

by Ladislav Michl

Subject: [PATCH] PM/runtime: Fix 'jiffies' in comments after move to hrtimers

PM-runtime now uses the hrtimers infrastructure for autosuspend, however
comments still reference 'jiffies'.

Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to using hrtimers")
Signed-off-by: Ladislav Michl <[email protected]>
---
drivers/base/power/runtime.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 70624695b6d5..096f7996d914 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -121,7 +121,7 @@ static void pm_runtime_cancel_pending(struct device *dev)
* Compute the autosuspend-delay expiration time based on the device's
* power.last_busy time. If the delay has already expired or is disabled
* (negative) or the power.use_autosuspend flag isn't set, return 0.
- * Otherwise return the expiration time in jiffies (adjusted to be nonzero).
+ * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
*
* This function may be called either with or without dev->power.lock held.
* Either way it can be racy, since power.last_busy may be updated at any time.
@@ -905,7 +905,7 @@ static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
spin_lock_irqsave(&dev->power.lock, flags);

expires = dev->power.timer_expires;
- /* If 'expire' is after 'jiffies' we've been called too early. */
+ /* If 'timer_expires' after 'now' we've been called too early. */
if (expires > 0 && expires < ktime_to_ns(ktime_get())) {
dev->power.timer_expires = 0;
rpm_suspend(dev, dev->power.timer_autosuspends ?
--
2.20.1

2019-01-09 22:42:20

by Rafael J. Wysocki

Subject: Re: [PATCH] PM/runtime: Fix 'jiffies' in comments after move to hrtimers

On Wed, Jan 9, 2019 at 6:23 PM Ladislav Michl <[email protected]> wrote:
>
> PM-runtime now uses the hrtimers infrastructure for autosuspend, however
> comments still reference 'jiffies'.
>
> Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to using hrtimers")
> Signed-off-by: Ladislav Michl <[email protected]>
> ---
> drivers/base/power/runtime.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 70624695b6d5..096f7996d914 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -121,7 +121,7 @@ static void pm_runtime_cancel_pending(struct device *dev)
> * Compute the autosuspend-delay expiration time based on the device's
> * power.last_busy time. If the delay has already expired or is disabled
> * (negative) or the power.use_autosuspend flag isn't set, return 0.
> - * Otherwise return the expiration time in jiffies (adjusted to be nonzero).
> + * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
> *
> * This function may be called either with or without dev->power.lock held.
> * Either way it can be racy, since power.last_busy may be updated at any time.
> @@ -905,7 +905,7 @@ static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
> spin_lock_irqsave(&dev->power.lock, flags);
>
> expires = dev->power.timer_expires;
> - /* If 'expire' is after 'jiffies' we've been called too early. */
> + /* If 'timer_expires' after 'now' we've been called too early. */

I would say "If 'expires' is after the current time, we've been called
to early" here.

> if (expires > 0 && expires < ktime_to_ns(ktime_get())) {
> dev->power.timer_expires = 0;
> rpm_suspend(dev, dev->power.timer_autosuspends ?
> --
> 2.20.1

2019-01-09 23:22:31

by Ladislav Michl

Subject: [PATCH v2] PM/runtime: Fix 'jiffies' in comments after move to hrtimers

PM-runtime now uses the hrtimers infrastructure for autosuspend, however
comments still reference 'jiffies'.

Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to using hrtimers")
Signed-off-by: Ladislav Michl <[email protected]>
---
Changes:
-v2: Reword comment accoring to Rafael's suggestion

drivers/base/power/runtime.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 70624695b6d5..a282e74d1a16 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -121,7 +121,7 @@ static void pm_runtime_cancel_pending(struct device *dev)
* Compute the autosuspend-delay expiration time based on the device's
* power.last_busy time. If the delay has already expired or is disabled
* (negative) or the power.use_autosuspend flag isn't set, return 0.
- * Otherwise return the expiration time in jiffies (adjusted to be nonzero).
+ * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
*
* This function may be called either with or without dev->power.lock held.
* Either way it can be racy, since power.last_busy may be updated at any time.
@@ -905,7 +905,10 @@ static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
spin_lock_irqsave(&dev->power.lock, flags);

expires = dev->power.timer_expires;
- /* If 'expire' is after 'jiffies' we've been called too early. */
+ /*
+ * If 'expires' is after the current time, we've been called
+ * too early.
+ */
if (expires > 0 && expires < ktime_to_ns(ktime_get())) {
dev->power.timer_expires = 0;
rpm_suspend(dev, dev->power.timer_autosuspends ?
--
2.20.1

2019-01-10 18:59:19

by Vincent Guittot

Subject: Re: [PATCH v2] PM/runtime: Fix 'jiffies' in comments after move to hrtimers

On Thu, 10 Jan 2019 at 00:19, Ladislav Michl <[email protected]> wrote:
>
> PM-runtime now uses the hrtimers infrastructure for autosuspend, however
> comments still reference 'jiffies'.
>
> Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to using hrtimers")
> Signed-off-by: Ladislav Michl <[email protected]>

Acked-by: Vincent Guittot <[email protected]>

> ---
> Changes:
> -v2: Reword comment accoring to Rafael's suggestion
>
> drivers/base/power/runtime.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 70624695b6d5..a282e74d1a16 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -121,7 +121,7 @@ static void pm_runtime_cancel_pending(struct device *dev)
> * Compute the autosuspend-delay expiration time based on the device's
> * power.last_busy time. If the delay has already expired or is disabled
> * (negative) or the power.use_autosuspend flag isn't set, return 0.
> - * Otherwise return the expiration time in jiffies (adjusted to be nonzero).
> + * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
> *
> * This function may be called either with or without dev->power.lock held.
> * Either way it can be racy, since power.last_busy may be updated at any time.
> @@ -905,7 +905,10 @@ static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
> spin_lock_irqsave(&dev->power.lock, flags);
>
> expires = dev->power.timer_expires;
> - /* If 'expire' is after 'jiffies' we've been called too early. */
> + /*
> + * If 'expires' is after the current time, we've been called
> + * too early.
> + */
> if (expires > 0 && expires < ktime_to_ns(ktime_get())) {
> dev->power.timer_expires = 0;
> rpm_suspend(dev, dev->power.timer_autosuspends ?
> --
> 2.20.1
>

2019-01-11 11:13:08

by Rafael J. Wysocki

Subject: Re: [PATCH v2] PM/runtime: Fix 'jiffies' in comments after move to hrtimers

On Thursday, January 10, 2019 12:19:44 AM CET Ladislav Michl wrote:
> PM-runtime now uses the hrtimers infrastructure for autosuspend, however
> comments still reference 'jiffies'.
>
> Fixes: 8234f6734c5d ("PM-runtime: Switch autosuspend over to using hrtimers")
> Signed-off-by: Ladislav Michl <[email protected]>
> ---
> Changes:
> -v2: Reword comment accoring to Rafael's suggestion
>
> drivers/base/power/runtime.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 70624695b6d5..a282e74d1a16 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -121,7 +121,7 @@ static void pm_runtime_cancel_pending(struct device *dev)
> * Compute the autosuspend-delay expiration time based on the device's
> * power.last_busy time. If the delay has already expired or is disabled
> * (negative) or the power.use_autosuspend flag isn't set, return 0.
> - * Otherwise return the expiration time in jiffies (adjusted to be nonzero).
> + * Otherwise return the expiration time in nanoseconds (adjusted to be nonzero).
> *
> * This function may be called either with or without dev->power.lock held.
> * Either way it can be racy, since power.last_busy may be updated at any time.
> @@ -905,7 +905,10 @@ static enum hrtimer_restart pm_suspend_timer_fn(struct hrtimer *timer)
> spin_lock_irqsave(&dev->power.lock, flags);
>
> expires = dev->power.timer_expires;
> - /* If 'expire' is after 'jiffies' we've been called too early. */
> + /*
> + * If 'expires' is after the current time, we've been called
> + * too early.
> + */
> if (expires > 0 && expires < ktime_to_ns(ktime_get())) {
> dev->power.timer_expires = 0;
> rpm_suspend(dev, dev->power.timer_autosuspends ?
>

Applied, thanks!