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Date:	Thu, 12 Feb 2015 09:09:30 +0800
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <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 <linaro-networking@...aro.org>
Subject: Re: [PATCH] clockevents: Introduce mode specific callbacks

On 11 February 2015 at 18:38, Peter Zijlstra <peterz@...radead.org> wrote:
> I think its better to be strict; esp. with new interfaces. It avoids
> confusion.
>
> Suppose a driver writer sees these new methods and thinks to use one
> while still having the set_mode() one -- ie. he didn't actually read the
> comment. We'd better make sure he fails and goes back to read it.

Okay, does below diff looks good to you ?

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index e646fbe44b05..75d221c7e9cc 100644
--- a/kernel/time/clockevents.c
+++ b/kernel/time/clockevents.c
@@ -444,8 +444,12 @@ EXPORT_SYMBOL_GPL(clockevents_unbind);
 static int clockevents_sanity_check(struct clock_event_device *dev)
 {
        /* Legacy set_mode() callback */
-       if (dev->set_mode)
+       if (dev->set_mode) {
+               /* We shouldn't be supporting new modes now */
+               WARN_ON(dev->set_mode_periodic || dev->set_mode_oneshot ||
+                       dev->set_mode_shutdown || dev->set_mode_resume);
                return 0;
+       }

        if (dev->features & CLOCK_EVT_FEAT_DUMMY)
                return 0;
--
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