linux-kernel - Re: [LNG] Re: [PATCH 12/14] hrtimer: don't emulate notifier call to initialize timer base

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Date:	Wed, 26 Mar 2014 19:47:15 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Linaro Networking <linaro-networking@...aro.org>
Subject: Re: [LNG] Re: [PATCH 12/14] hrtimer: don't emulate notifier call to
 initialize timer base

On 26 March 2014 18:10, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> I don't think this is such a good idea. Open-coding a part of that callback
> in the init routine can lead to loop-holes down the road:

We think that we are open-coding part of that callback here because it is
implemented that way on the first design.

Rather, we should have a common routine which should do all the work
required when a CPU comes up. And any modification should be done
to that code.

> what if someone
> changes or adds something to the CPU_UP_PREPARE switch-case, and forgets to
> do the same in the init-routine?

This is not a driver which only 2-3 people use. This part is so well reviewed
by so many highly smart people that this should never happen. And if it
happens than its nothing but a review mistake.

> It is more comforting to know that there is just one single place where CPU
> hotplug operations are handled (hrtimer_cpu_notify). That, in turn is good
> for reliability because it makes it easier to write bug-free code.

And for me that single place is: init_hrtimers_cpu() :)
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