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

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Message-ID: <52F97892.1040205@cn.fujitsu.com>
Date:	Tue, 11 Feb 2014 09:10:42 +0800
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Namhyung Kim <namhyung@...nel.org>, linux-kernel@...r.kernel.org,
	peterz@...radead.org, raistlin@...ux.it, juri.lelli@...il.com,
	clark.williams@...il.com, mingo@...hat.com
Subject: Re: [PATCH 1/3] sched: Move the priority specific bits into a new
 header file.

Hi Steven,

On 02/10/2014 10:09 PM, Steven Rostedt wrote:
>
>
> That's why you have:
>
> +++ b/include/linux/sched/prio.h
> @@ -0,0 +1,23 @@
> +#ifndef _SCHED_PRIO_H
> +#define _SCHED_PRIO_H
>
> The first time a header gets included, it checks if _SCHED_PRIO_H is
> defined, if not, it defines it and continues. Otherwise it skips the
> content of the file.
>
> This is so standard practice that CPP (C Pre-Processor) optimizes this
> by checking if this exists and caches it. It wont even open the file
> the second time it sees it included.

Wow, yes. Thank you for your kind explanation. :)
>
> -- Steve
> --
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