linux-kernel - Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

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Message-id: <20130717165943.7f06acd9@amdc308.digital.local>
Date:	Wed, 17 Jul 2013 16:59:43 +0200
From:	Lukasz Majewski <l.majewski@...sung.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Lukasz Majewski <l.majewski@...ess.pl>,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>,
	Myungjoo Ham <myungjoo.ham@...sung.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andre Przywara <andre.przywara@...aro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>
Subject: Re: [PATCH v4 2/7] cpufreq: Add boost frequency support in core

On Wed, 17 Jul 2013 18:31:19 +0530 Viresh Kumar viresh.kumar@...aro.org
wrote,
> On 17 July 2013 17:01, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > First off, I'm not sure how many applications actually use it and I
> > think, if any, they should be able cope with the attribute not
> > being present.
> >
> > Of course, if it turns out that yes, there are applications using
> > it and no, they cannot cope with the missing attribute, we'll need
> > to address this. That said such applications wouldn't work with
> > earlier kernels in which that attribute wasn't present at all, so I
> > suppose this is really unlikely.
> >
> > So, do whichever makes more sense to you: Design things to preserve
> > the old behavior (which is sightly confusing) or design them to
> > expose the attribute if the feature is actually supported and be
> > prepared to address the (unlikely) case when some hypothetical
> > applications break because of that.
> 
> Okay. Its better to keep it the way Lukasz designed it in his last
> patchset.

To be 100% sure - we export boost only when supported (as proposed at v5).


-- 
Best regards,

Lukasz Majewski

Samsung R&D Institute Poland (SRPOL) | Linux Platform Group
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