linux-kernel - Re: [PATCH V2 4/9] cpufreq: governor: Drop __gov_queue

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Date:	Wed, 09 Sep 2015 03:04:34 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	preeti.lkml@...il.com, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 4/9] cpufreq: governor: Drop __gov_queue_work()

On Tuesday, September 08, 2015 07:30:44 AM Viresh Kumar wrote:
> On 08-09-15, 03:15, Rafael J. Wysocki wrote:
> > On Monday, July 27, 2015 05:58:09 PM Viresh Kumar wrote:
> > > __gov_queue_work() isn't required anymore and can be merged with
> > > gov_queue_work(). Do it.
> > > 
> > > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> > 
> > Quite frankly I don't see the point.
> 
> But isn't that just an unnecessary wrapper ?

It isn't a wrapper, just a separation of code executed in each step of
the loop.  There's nothing wrong with having a separate function for that
in principle.

I wouldn't make a fuss about that if that was new code even, so I don't
see why we should change it.

> > I'd even remove the inline from its definition and let the compiler decide
> > what to do with it.
> 
> What if the compiler decides to link it? Why add a function call for
> (almost) no use?

If the compiler does that, let it do it. :-)

If you think that you can outsmart the compiler people by doing such
optimizations at this level manually, you're likely wrong.  Serious
man-hours go into making that stuff work as well as it can in compilers.

Thanks,
Rafael

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