linux-kernel - Re: [PATCH 2/2] timer: Make sure TIMER_FLAG

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Date:	Fri, 28 Feb 2014 22:21:50 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"tj@...nel.org" <tj@...nel.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>
Subject: Re: [PATCH 2/2] timer: Make sure TIMER_FLAG_MASK bits are free in allocated base



> On 28-Feb-2014, at 4:22 pm, Thomas Gleixner <tglx@...utronix.de> wrote:
> 
>> On Fri, 28 Feb 2014, Viresh Kumar wrote:
>> 
>> Currently we are using two lowest bit of base for internal purpose and so they
>> both should be zero in the allocated address. The code was doing the right thing
>> before this patch came in:
>> 
>> commit c5f66e99b7cb091e3d51ae8e8156892e8feb7fa3
>> Author: Tejun Heo <tj@...nel.org>
>> Date:   Wed Aug 8 11:10:28 2012 -0700
>> 
>>    timer: Implement TIMER_IRQSAFE
>> 
>> Tejun probably forgot to update this piece of code which checks if the lowest
>> 'n' bits are zero or not and so wasn't updated according to the new flag. Lets
>> use TIMER_FLAG_MASK in the calculations here, so that this code wouldn't require
>> a change later on with another flag in.
> 
> Are you planning to introduce more flag horror? Don't go there. The
> timer_list code is about to be rewritten completely and I'm not going
> to add new features to the existing code base.

Not at all. I was just trying to understand this framework and found this
Issue.--
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