linux-kernel - Re: [PATCH 1/3] sched: Move the priority specific bits into a new header file.

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Date:	Mon, 10 Feb 2014 10:56:34 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	raistlin@...ux.it, juri.lelli@...il.com, clark.williams@...il.com,
	mingo@...hat.com, rostedt@...dmis.org
Subject: Re: [PATCH 1/3] sched: Move the priority specific bits into a new
 header file.


Hi Namhyung,

On 01/29/2014 01:28 PM, Namhyung Kim wrote:
> Hi Dongsheng,
>
> On Mon, 27 Jan 2014 17:15:37 -0500, Dongsheng Yang wrote:
>> Some bits about priority are defined in linux/sched/rt.h, but
>> some of them are not only for rt scheduler, such as MAX_PRIO.
>>
>> This patch move them all into a new header file, linux/sched/prio.h.
>>
>> Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
>> ---
>>   include/linux/sched.h      |  4 ++++
>>   include/linux/sched/prio.h | 23 +++++++++++++++++++++++
>>   include/linux/sched/rt.h   | 21 +++------------------
>>   3 files changed, 30 insertions(+), 18 deletions(-)
>>   create mode 100644 include/linux/sched/prio.h
>>
>> diff --git a/include/linux/sched.h b/include/linux/sched.h
>> index 68a0e84..ba1b732 100644
>> --- a/include/linux/sched.h
>> +++ b/include/linux/sched.h
>> @@ -3,6 +3,10 @@
>>   
>>   #include <uapi/linux/sched.h>
>>   
>> +#ifndef _SCHED_PRIO_H
>> +#include <linux/sched/prio.h>
>> +#endif /* #ifndef _SCHED_PRIO_H */
> It seems you don't need to use #ifndef-#endif pair to include a header
> file?

Sorry for the late reply, coming back from vacation for Chinese Spring 
Festival.

The reason I use #ifndef-#endif here is that there are lots of files,
  such as kernel/sched/sched.h, are including <linux/sched.h> and
<linux/sched/rt.h>. And both of them are including prio.h.

I am not sure should we avoid reincluding a file and how.

Could you help to give me some suggestion of it. Thanx :)

> Thanks,
> Namhyung
>

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