linux-kernel - Re: [PATCH 10/10] cpufreq: mvebu: Use generic platdev driver

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Date:	Mon, 25 Apr 2016 18:26:05 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, nm@...com,
	Andrew Lunn <andrew@...n.ch>, linaro-kernel@...ts.linaro.org,
	Jason Cooper <jason@...edaemon.net>, linux-pm@...r.kernel.org,
	sboyd@...eaurora.org, Rafael Wysocki <rjw@...ysocki.net>,
	linux-kernel@...r.kernel.org,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	thomas.petazzoni@...e-electrons.com,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH 10/10] cpufreq: mvebu: Use generic platdev driver

On 25-04-16, 14:53, Arnd Bergmann wrote:
> On Monday 25 April 2016 08:30:41 Viresh Kumar wrote:

> I realize that the ordering is fixed through the way that the kernel
> is linked, my worry is more about someone changing the code in some
> way because it's not obvious from reading the code that the
> dependency exists. If either the armada_xp_pmsu_cpufreq_init()
> initcall gets changed so it does not always get called, or the
> cpufreq_dt_platdev_init() initcall gets changed so it comes a little
> earlier, things will break.

cpufreq-dt will just error out in that case, because it wouldn't find
any OPPs registered to the OPP-core. It *shouldn't* crash and if it
does, then we have a problem to fix.

> > The other thing that can happen is that armada_xp_pmsu_cpufreq_init()
> > call can fail. In that case, most of the times cpufreq-dt ->init()
> > will fail as well, so even that is fine for me.
> > 
> > And, so I think we can keep this patch as is.
> 
> What are the downsides of moving armada_xp_pmsu_cpufreq_init()
> into drivers/cpufreq?

More special code :)

-- 
viresh