From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Namhyung Kim <namhyung@kernel.org>,
linux-kernel@vger.kernel.org, peterz@infradead.org,
raistlin@linux.it, juri.lelli@gmail.com,
clark.williams@gmail.com, mingo@redhat.com
Subject: Re: [PATCH 1/3] sched: Move the priority specific bits into a new header file.
Date: Tue, 11 Feb 2014 09:10:42 +0800 [thread overview]
Message-ID: <52F97892.1040205@cn.fujitsu.com> (raw)
In-Reply-To: <20140210090948.02266f38@gandalf.local.home>
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
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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next prev parent reply other threads:[~2014-02-11 1:10 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-22 22:41 [PATCH] tracing: Use task_nice() in function __update_max_tr() to get the nice value of task Dongsheng Yang
2014-01-23 3:56 ` Steven Rostedt
2014-01-23 4:00 ` Steven Rostedt
2014-01-23 17:11 ` Dongsheng Yang
2014-01-23 8:26 ` Peter Zijlstra
2014-01-23 11:52 ` Steven Rostedt
2014-01-27 22:15 ` [PATCH 0/3] sched: Collect the bits about priority into a new header file, include/linux/sched/prio.h Dongsheng Yang
2014-01-27 15:45 ` Steven Rostedt
[not found] ` <CA+qeAOqW58894hGvCP0N0E-EUESfFPeqMmXUuhqxEZrRjDV97A@mail.gmail.com>
2014-01-28 16:06 ` Steven Rostedt
2014-01-27 22:15 ` [PATCH 1/3] sched: Move the priority specific bits into a new header file Dongsheng Yang
2014-01-29 5:28 ` Namhyung Kim
2014-02-10 2:56 ` Dongsheng Yang
2014-02-10 14:09 ` Steven Rostedt
2014-02-11 1:10 ` Dongsheng Yang [this message]
2014-02-10 13:30 ` [tip:sched/core] " tip-bot for Dongsheng Yang
2014-01-27 22:15 ` [PATCH 2/3] sched: Expose some macros related with priority Dongsheng Yang
2014-02-10 13:30 ` [tip:sched/core] sched: Expose some macros related to priority tip-bot for Dongsheng Yang
2014-01-27 22:15 ` [PATCH 3/3] sched: Implement task_nice and task_prio as static inline functions Dongsheng Yang
2014-01-27 10:32 ` Peter Zijlstra
2014-01-28 1:09 ` Dongsheng Yang
2014-01-27 12:16 ` Peter Zijlstra
2014-01-28 1:59 ` Dongsheng Yang
2014-01-27 13:08 ` Peter Zijlstra
2014-01-28 3:00 ` [PATCH 3/3 V2] sched: Implement task_nice as static inline function Dongsheng Yang
2014-01-28 3:27 ` Dongsheng Yang
2014-02-10 13:32 ` [tip:sched/core] sched: Implement task_nice() " tip-bot for Dongsheng Yang
2014-01-23 21:43 ` [PATCH] tracing: Use task_nice() in function __update_max_tr() to get the nice value of task Dongsheng Yang
2014-02-11 3:19 ` Dongsheng Yang
-- strict thread matches above, loose matches on Subject: below --
2014-02-10 9:05 [PATCH 0/3 V2] sched: Collect the bits about priority into a new header file, include/linux/sched/prio.h Dongsheng Yang
2014-02-10 9:05 ` [PATCH 1/3] sched: Move the priority specific bits into a new header file Dongsheng Yang
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