linux-kernel - Re: [PATCH 13/13] cpufreq: make sure frequency transitions are serialized

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Message-ID: <2165396.dF1lQyPRVT@vostro.rjw.lan>
Date:	Mon, 24 Jun 2013 15:33:41 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com, arvind.chauhan@....com,
	dave.martin@....com
Subject: Re: [PATCH 13/13] cpufreq: make sure frequency transitions are serialized

On Monday, June 24, 2013 06:46:39 PM Viresh Kumar wrote:
> On 24 June 2013 18:53, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > You can do
> >
> >         if (WARN(transition_ongoing, "<text>"))
> >                 return;
> >
> > and below analogously.
> 
> Ahh.. stupid code.. Check if this fixup is fine (attached too)

Looks OK, but since transition_ongoing is either 0 or 1 now, as far as I can
say, it would be better to make it a bool and use = true/false instead of
++/-- I suppose.

Thanks,
Rafael


> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 6624694..6ca7eac 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -267,10 +267,9 @@ void __cpufreq_notify_transition(struct
> cpufreq_policy *policy,
>         switch (state) {
> 
>         case CPUFREQ_PRECHANGE:
> -               if (transition_ongoing) {
> -                       WARN(1, "In middle of another frequency transition\n");
> +               if (WARN(transition_ongoing,
> +                               "In middle of another frequency transition\n"))
>                         return;
> -               }
> 
>                 transition_ongoing++;
> 
> @@ -293,10 +292,9 @@ void __cpufreq_notify_transition(struct
> cpufreq_policy *policy,
>                 break;
> 
>         case CPUFREQ_POSTCHANGE:
> -               if (!transition_ongoing) {
> -                       WARN(1, "No frequency transition in progress\n");
> +               if (WARN(!transition_ongoing,
> +                               "No frequency transition in progress\n"))
>                         return;
> -               }
> 
>                 transition_ongoing--;
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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