linux-kernel - Re: [PATCH 2/2] cpuidle: fix sysfs output for power

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Date:	Sat, 15 Dec 2012 01:03:02 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Sivaram Nair <sivaramn@...dia.com>
Cc:	rafael.j.wysocki@...el.com, daniel.lezcano@...aro.org,
	shuox.liu@...el.com, akpm@...ux-foundation.org,
	yanmin_zhang@...el.com, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cpuidle: fix sysfs output for power_usage

On Friday, December 14, 2012 03:17:37 PM Sivaram Nair wrote:
> cpuidle_state->power_usage is signed; so change the corresponding sysfs
> ops to output signed value instead of unsigned.

What's actually wrong with printing it as an unsigned int?

Rafael


> Signed-off-by: Sivaram Nair <sivaramn@...dia.com>
> ---
>  drivers/cpuidle/sysfs.c |    9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
> index 3409429..2fc79cd 100644
> --- a/drivers/cpuidle/sysfs.c
> +++ b/drivers/cpuidle/sysfs.c
> @@ -232,6 +232,13 @@ static struct cpuidle_state_attr attr_##_name = __ATTR(_name, 0644, show, store)
>  static ssize_t show_state_##_name(struct cpuidle_state *state, \
>  			 struct cpuidle_state_usage *state_usage, char *buf) \
>  { \
> +	return sprintf(buf, "%d\n", state->_name);\
> +}
> +
> +#define define_show_state_u_function(_name) \
> +static ssize_t show_state_##_name(struct cpuidle_state *state, \
> +			 struct cpuidle_state_usage *state_usage, char *buf) \
> +{ \
>  	return sprintf(buf, "%u\n", state->_name);\
>  }
>  
> @@ -270,7 +277,7 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, \
>  	return sprintf(buf, "%s\n", state->_name);\
>  }
>  
> -define_show_state_function(exit_latency)
> +define_show_state_u_function(exit_latency)
>  define_show_state_function(power_usage)
>  define_show_state_ull_function(usage)
>  define_show_state_ull_function(time)
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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