linux-kernel - Re: [ANNOUNCE] 3.12.5-rt6

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Date:	Tue, 17 Dec 2013 15:35:45 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <bitbucket@...ine.de>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.12.5-rt6

On 12/17/2013 03:26 PM, Mike Galbraith wrote:
> On Tue, 2013-12-17 at 09:16 -0500, Steven Rostedt wrote: 
>>
>>> @@ -1129,11 +1127,8 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
>>>  		 * is actually now running somewhere else!
>>>  		 */
>>>  		while (task_running(rq, p)) {
>>> -			if (match_state) {
>>> -				if (!unlikely(check_task_state(p, match_state)))
>>> -					return 0;
>>> +			if (match_state && !check_task_state(p, match_state))
>>
>> Ah, it was that "!unlikely(" that caused me to miss the '!'. That
>> should have been: likely(!check_task_state()). But anyway, I rather
>> just keep what you wrote and drop the unlikely altogether.
> 
> Maybe better would be to put the thing back inline, with a brief
> reference to the race.

There is similar code in
- task_is_stopped_or_traced()
- task_is_traced()

and I didn't get around to have one function for this stupid check
since the check is always a little different.

> -Mike

Sebastian
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