linux-kernel - Re: [LNG] Re: [PATCH 04/14] hrtimer: use base->index instead of basenum in switch_hrtimer

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Date:	Wed, 26 Mar 2014 19:38:51 +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 04/14] hrtimer: use base->index instead of
 basenum in switch_hrtimer_base()

On 26 March 2014 17:13, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>> +     new_base = &new_cpu_base->clock_base[base->index];
>
> Further down, timer->base can be altered (and set to NULL too).
> So if we jump back to 'again', we'll end up in trouble.
> So I think its important to cache the value in basenum and
> use it.

base is a parameter to this function and never changes. So
base->index is guaranteed to be valid and same during a functions call.
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