linux-kernel - Re: [PATCH] cpuidle: add missing header include

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Message-ID: <508E5053.5090005@linaro.org>
Date:	Mon, 29 Oct 2012 10:45:55 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Jingoo Han <jg1.han@...sung.com>
CC:	"'Rafael J. Wysocki'" <rafael.j.wysocki@...el.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuidle: add missing header include

On 10/29/2012 02:16 AM, Jingoo Han wrote:
> On Monday, October 29, 2012 6:49 AM Marek Vasut wrote
>>
>> On 10/26/2012 06:30 AM, Jingoo Han wrote:
>>> This patch adds missing device.h header to fix build warnings as below:
>>>
>>> drivers/cpuidle/cpuidle.h:26:41: warning: 'struct device' declared inside parameter list [enabled by
>> default]
>>> drivers/cpuidle/cpuidle.h:26:41: warning: its scope is only this definition or declaration, which is
>> probably not what you want
>>> [enabled by default]
>>> drivers/cpuidle/cpuidle.h:27:45: warning: 'struct device' declared inside parameter list [enabled by
>> default]
>>> In file included from drivers/cpuidle/driver.c:15:0:
>>> drivers/cpuidle/cpuidle.h:26:41: warning: 'struct device' declared inside parameter list [enabled by
>> default]
>>> drivers/cpuidle/cpuidle.h:26:41: warning: its scope is only this definition or declaration, which is
>> probably not what you want
>>> [enabled by default]
>>> drivers/cpuidle/cpuidle.h:27:45: warning: 'struct device' declared inside parameter list [enabled by
>> default]
>>>
>>> This build warning is introduced by commit efeca1b
>>> "cpuidle / sysfs: change function parameter".
>>>
>>> Signed-off-by: Jingoo Han <jg1.han@...sung.com>
>>> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
>>> ---
>>
>> Jingoo, could you copy-pastebin your config file. I don't have this
>> warning and I would like to understand why.
> 
> Hi Daniel Lezcano,
> 
> Could you build the code by using GCC 4.6.x?
> In my opinion, it would be better.
> 
> Also, my config option is as below:
>     make exynos4_defconfig + CONFIG_CPU_IDLE
> 

Ok, I got it.

on x86, the header ioport.h is included indirectly by the headers
including headers. In this file there is a forward declaration.
For ARM, this is not the case.

This is why the warning does not appear on x86 but on ARM.

Thanks
  -- Daniel

>> Thanks
>>   -- Daniel
>>
>>>  drivers/cpuidle/cpuidle.h |    2 ++
>>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/cpuidle/cpuidle.h b/drivers/cpuidle/cpuidle.h
>>> index a5bbd1c..2120d9e 100644
>>> --- a/drivers/cpuidle/cpuidle.h
>>> +++ b/drivers/cpuidle/cpuidle.h
>>> @@ -5,6 +5,8 @@
>>>  #ifndef __DRIVER_CPUIDLE_H
>>>  #define __DRIVER_CPUIDLE_H
>>>
>>> +#include <linux/device.h>
>>> +
>>>  /* For internal use only */
>>>  extern struct cpuidle_governor *cpuidle_curr_governor;
>>>  extern struct list_head cpuidle_governors;
>>
>>
>> --
>>  <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
>>
>> Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
>> <http://twitter.com/#!/linaroorg> Twitter |
>> <http://www.linaro.org/linaro-blog/> Blog
> 


-- 
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