linux-kernel - Re: [PATCH v2] clockevents: Introduce mode specific callbacks

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Message-ID: <1911031.mQ9ZbsnC1C@vostro.rjw.lan>
Date:	Fri, 13 Feb 2015 03:11:32 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Kevin Hilman <khilman@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linaro-networking@...aro.org, peterz@...radead.org
Subject: Re: [PATCH v2] clockevents: Introduce mode specific callbacks

On Friday, February 13, 2015 08:54:56 AM Viresh Kumar wrote:
> It is not possible for the clockevents core to know which modes (other than
> those with a corresponding feature flag) are supported by a particular
> implementation. And drivers are expected to handle transition to all modes
> elegantly, as ->set_mode() would be issued for them unconditionally.
> 
> Now, adding support for a new mode complicates things a bit if we want to use
> the legacy ->set_mode() callback. We need to closely review all clockevents
> drivers to see if they would break on addition of a new mode. And after such
> reviews, it is found that we have to do non-trivial changes to most of the
> drivers [1].
> 
> Introduce mode-specific set_mode_*() callbacks, some of which the drivers may or
> may not implement. A missing callback would clearly convey the message that the
> corresponding mode isn't supported.

This is not going to fly AFAICS if you don't say what exacly you need it for.

Rafael

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