linux-kernel - Re: [PATCH] cpufreq: report driver's successful {un}registration

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Date:	Thu, 10 Jul 2014 17:01:19 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>, rjw@...ysocki.net
CC:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, arvind.chauhan@....com
Subject: Re: [PATCH] cpufreq: report driver's successful {un}registration

On 06/26/2014 02:21 PM, Viresh Kumar wrote:
> We do report driver's successful {un}registration from cpufreq core, but is done
> with pr_debug() and so this doesn't appear in boot logs.
> 
> Convert this to pr_info() to make it visible in logs.
> 

While at it, let's also standardize those messages, since they will be
more visible now.

> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/cpufreq/cpufreq.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index 62259d2..63d8f8f 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -2468,7 +2468,7 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data)
>  	}
> 
>  	register_hotcpu_notifier(&cpufreq_cpu_notifier);
> -	pr_debug("driver %s up and running\n", driver_data->name);
> +	pr_info("driver %s up and running\n", driver_data->name);

How about "Registered cpufreq driver: %s\n"

> 
>  	return 0;
>  err_if_unreg:
> @@ -2499,7 +2499,7 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver)
>  	if (!cpufreq_driver || (driver != cpufreq_driver))
>  		return -EINVAL;
> 
> -	pr_debug("unregistering driver %s\n", driver->name);
> +	pr_info("unregistering driver %s\n", driver->name);

And "Unregistered cpufreq driver: %s\n"

(Also, its probably a good idea to have 2 prints here, just like we have for
cpufreq_register_driver() - one with pr_debug() at the beginning of the
function which tells us that we are *about* to register the driver, and then
a second print with pr_info() at the end of the function that tells us that
we successfully registered the driver. We can do the same thing for
unregistration as well.)

> 
>  	subsys_interface_unregister(&cpufreq_interface);
>  	if (cpufreq_boost_supported())
> 

Regards,
Srivatsa S. Bhat

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