linux-kernel - Re: [PATCH v9 2/8] sched/core: Streamlining calls to task_rq

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Message-ID: <b18f1ec3-46a1-e65e-2c6e-85729031c996@arm.com>
Date:   Mon, 22 Jul 2019 11:08:17 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     peterz@...radead.org, mingo@...hat.com, rostedt@...dmis.org,
        tj@...nel.org, linux-kernel@...r.kernel.org,
        luca.abeni@...tannapisa.it, claudio@...dence.eu.com,
        tommaso.cucinotta@...tannapisa.it, bristot@...hat.com,
        mathieu.poirier@...aro.org, lizefan@...wei.com, longman@...hat.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v9 2/8] sched/core: Streamlining calls to task_rq_unlock()

On 7/22/19 10:32 AM, Juri Lelli wrote:
> On 22/07/19 10:21, Dietmar Eggemann wrote:
>> On 7/19/19 3:59 PM, Juri Lelli wrote:
>>> From: Mathieu Poirier <mathieu.poirier@...aro.org>
>>
>> [...]
>>
>>> @@ -4269,8 +4269,8 @@ static int __sched_setscheduler(struct task_struct *p,
>>>  			 */
>>>  			if (!cpumask_subset(span, &p->cpus_allowed) ||
>>
>> This doesn't apply cleanly on v5.3-rc1 anymore due to commit
>> 3bd3706251ee ("sched/core: Provide a pointer to the valid CPU mask").
>>
>>>  			    rq->rd->dl_bw.bw == 0) {
>>> -				task_rq_unlock(rq, p, &rf);
>>> -				return -EPERM;
>>> +				retval = -EPERM;
>>> +				goto unlock;
>>>  			}
>>>  		}
>>>  #endif
> 
> Thanks for reporting. The set is based on cgroup/for-next (as of last
> week), though. I can of course rebase on tip/sched/core or mainline if
> needed.

Not sure, there is another little issue on 3/8 since uclamp is in
v5.3-rc1 as well commit 69842cba9ace8 ("sched/uclamp: Add CPU's clamp
buckets refcounting").