linux-kernel - Re: [PATCH] thermal: cpu_cooling: fix ptr

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Date:	Thu, 5 Mar 2015 00:46:13 -0400
From:	Eduardo Valentin <edubezval@...il.com>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	Javi Merino <javi.merino@....com>, kbuild-all@...org,
	Kapileshwar Singh <kapileshwar.singh@....com>,
	Punit Agrawal <punit.agrawal@....com>,
	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: cpu_cooling: fix ptr_ret.cocci warnings

On Thu, Mar 05, 2015 at 04:34:02AM +0800, kbuild test robot wrote:
> drivers/thermal/cpu_cooling.c:463:18-24: WARNING: PTR_ERR_OR_ZERO can be used
> 
> 
>  Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
> 
> Generated by: scripts/coccinelle/api/ptr_ret.cocci
> 
> CC: Javi Merino <javi.merino@....com>
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> ---
> 
>  cpu_cooling.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/thermal/cpu_cooling.c
> +++ b/drivers/thermal/cpu_cooling.c
> @@ -460,7 +460,7 @@ static int get_static_power(struct cpufr
>  	if (voltage == 0) {
>  		dev_warn_ratelimited(cpufreq_device->cpu_dev,
>  				     "Failed to get voltage for frequency %lu: %ld\n",
> -				     freq_hz, IS_ERR(opp) ? PTR_ERR(opp) : 0);
> +				     freq_hz, PTR_ERR_OR_ZERO(opp));

This patch causes this compilation warning.

In file included from include/linux/device.h:27:0,
                 from include/linux/thermal.h:30,
                 from drivers/thermal/cpu_cooling.c:26:
drivers/thermal/cpu_cooling.c: In function ‘get_static_power’:
include/linux/ratelimit.h:31:9: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 4 has type ‘int’ [-Wformat=]
  struct ratelimit_state name =     \
         ^
include/linux/device.h:1162:9: note: in expansion of macro ‘DEFINE_RATELIMIT_STATE’
  static DEFINE_RATELIMIT_STATE(_rs,    \
         ^
include/linux/device.h:1178:2: note: in expansion of macro ‘dev_level_ratelimited’
  dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
  ^
drivers/thermal/cpu_cooling.c:463:3: note: in expansion of macro ‘dev_warn_ratelimited’
   dev_warn_ratelimited(cpufreq_device->cpu_dev,
   ^

>  		return -EINVAL;
>  	}
>  

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