linux-kernel - Re: [PATCH 01/27] PM: Add helper pm_runtime_last_busy_and

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Date:	Thu, 25 Sep 2014 10:13:55 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	subhransu.s.prusty@...el.com,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 01/27] PM: Add helper pm_runtime_last_busy_and_autosuspend()

On 24 September 2014 18:14, Vinod Koul <vinod.koul@...el.com> wrote:
> From: Subhransu S. Prusty <subhransu.s.prusty@...el.com>
>
> pm_runtime_mark_last_busy and pm_runtime_put_autosuspend are used together
> in quite a lot of places. Add a helper for these.
> Also updated Documentation for this
>
> Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@...el.com>
> Signed-off-by: Vinod Koul <vinod.koul@...el.com>
> ---
>  Documentation/power/runtime_pm.txt |    4 ++++
>  include/linux/pm_runtime.h         |    6 ++++++
>  2 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
> index f32ce54..5d9565b 100644
> --- a/Documentation/power/runtime_pm.txt
> +++ b/Documentation/power/runtime_pm.txt
> @@ -490,6 +490,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
>        power.use_autosuspend isn't set, otherwise returns the expiration time
>        in jiffies
>
> +   int pm_runtime_last_busy_and_autosuspend(struct device *dev);
> +    - invoke pm_runtime_mark_last_busy(dev) and then run
> +      pm_runtime_put_autosuspend(dev) and return its result
> +
>  It is safe to execute the following helper functions from interrupt context:
>
>  pm_request_idle()
> diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
> index 367f49b..256ec50 100644
> --- a/include/linux/pm_runtime.h
> +++ b/include/linux/pm_runtime.h
> @@ -277,4 +277,10 @@ static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
>         __pm_runtime_use_autosuspend(dev, false);
>  }
>
> +static inline int pm_runtime_last_busy_and_autosuspend(struct device *dev)

This doesn't help code readability I think. The function name is quite
long as Pavel also pointed out. :-)

And, I also lack the "put" prefix, following the other functions in
the runtime PM API - which would make the name even longer. :-)

Kind regards
Uffe
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