linux-kernel - Re: [PATCH 1/2] sched: move scheduler sysctl bits into dedicated header file

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Date:	Tue, 29 Jan 2013 13:05:24 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Clark Williams <williams@...hat.com>
Cc:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sched: move scheduler sysctl bits into dedicated
 header file

On Tue, 2013-01-29 at 11:57 -0600, Clark Williams wrote:

> > > +/* provide a home for sysctl scheduler tuning knobs */
> > > +
> > > +/*
> > > + * default timeslice is 100 msecs (used only for SCHED_RR tasks).
> > > + * Timeslices get refilled after they expire.
> > > + */
> > > +#define RR_TIMESLICE		(100 * HZ / 1000)
> > 
> > It seems this line came from sched.h but I can't find that part
> > deleted.
> > 
> 
> Arggghh! I reorganized the commits and didn't remove RR_TIMESLICE when
> I moved it. I'm surprised it compiled. 
> 
> I can generate a new patchset or let Ingo just remove it from sched.h.

gcc won't warn if you define a macro to what it is already defined to.

#define foo bar
#define foo bar

won't warn


#define foo bar
#define foo cat

will.

-- Steve


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