linux-kernel - Re: [PATCH] clockevents: Add (missing) default case for switch blocks

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Message-ID: <20150220113753.GP5029@twins.programming.kicks-ass.net>
Date:	Fri, 20 Feb 2015 12:37:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, linaro-kernel@...ts.linaro.org,
	Kevin Hilman <khilman@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	linaro-networking@...aro.org, Steven Miao <realmz6@...il.com>,
	Mark Salter <msalter@...hat.com>,
	Michal Simek <monstr@...str.eu>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Ley Foon Tan <lftan@...era.com>,
	Jonas Bonn <jonas@...thpole.se>,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Dike <jdike@...toit.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>
Subject: Re: [PATCH] clockevents: Add (missing) default case for switch blocks

On Fri, Feb 20, 2015 at 10:36:59AM +0100, Ingo Molnar wrote:
> > But it does mean we need to be able to add values to the 
> > enum.
> 
> So I'm confused: if we are using proper callbacks (like my 
> example outlined) , why is a 'mode enum' needed at all?

Ah, its because the enum is shared between two different use-cases. The
one is the clockevent driver for the clock_event_device::set_mode()
call, and one is the clockevent core call: clockevent_set_mode().

The previous patch changed the driver interface, but retained the
sharing of the enum across both interfaces.

Maybe we should break that enum into two; one for devices and one for
the core interface and avoid the problem that way.
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