linux-kernel - Re: [patch] sched

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Message-ID: <20070525082150.GG8094@one.firstfloor.org>
Date:	Fri, 25 May 2007 10:21:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] sched_clock(): cleanups

On Fri, May 25, 2007 at 10:16:39AM +0200, Peter Zijlstra wrote:
> On Fri, 2007-05-25 at 09:58 +0200, Andi Kleen wrote:
> > On Fri, May 25, 2007 at 09:39:33AM +0200, Peter Zijlstra wrote:
> > > On Fri, 2007-05-25 at 13:05 +0530, Satyam Sharma wrote:
> > > > On 5/25/07, Ingo Molnar <mingo@...e.hu> wrote:
> > > 
> > > > > call_r_s_f() still needs an urgent rerenaming though =B-)
> > > > 
> > > > So does "call_r_s_f_here()" :-)
> > > 
> > > That name makes me think of INTERCAL's 'DO COME FROM' statement.
> > > And any code that makes one think of INTERCAL is say,.. special.. :-)
> > 
> > Propose a better way to code this then? It's not my fault that dealing with 
> > callbacks in C is so messy. _here just massages one callback
> > prototype (smp_call_function's) into another (cpufreq's) because
> > both callbacks do the same in this case.
> 
> I see you point; however a function called:
> call_<some_other_function>_here() just doesn't make sense. It says as
> much as: we should call some_other_function() but for some reason we
> dont.

It's just different semantics between cpufreq and smp_call_functions.
cpufreq doesn't execute on that CPU but gives you the cpu number,
smp_call_* executes on that CPU but doesn't give you a cpu number.
_here means call cpufreq callback on the current CPU.

-Andi
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