linux-kernel - Re: [PATCH 6/7] cpufreq: intel

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Message-ID: <1402435605.4082.3.camel@joe-AO725>
Date:	Tue, 10 Jun 2014 14:26:45 -0700
From:	Joe Perches <joe@...ches.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Stratos Karafotis <stratosk@...aphore.gr>,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	dirk.j.brandewie@...el.com, Viresh Kumar <viresh.kumar@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/7] cpufreq: intel_pstate: Trivial code cleanup

On Tue, 2014-06-10 at 23:38 +0200, Rafael J. Wysocki wrote:

> > > is.  And the result of (a * 100) / b may generally be different from
> > > a * 100 / b for integers (if the division is carried out first).
> > 
> > I thought that (a * 100) / b is always equivalent to a * 100 / b.
> 
> I'm not actually sure if that's guaranteed by C standards.

It is.  left to right, same precedence.

> It surely
> wasn't some time ago (when there was no formal C standard).

c89 is 25 years ago now.

> Either way, in my opinion it's better to put the parens into the expression
> in this particular case to clearly state the intention.

I don't think so.


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