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Date:   Mon, 18 Mar 2019 14:10:50 +0100
From:   Peter Zijlstra <peterz@infradead.org>
To:     Patrick Bellasi <patrick.bellasi@arm.com>
Cc:     linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
        linux-api@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
        Tejun Heo <tj@kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Paul Turner <pjt@google.com>,
        Quentin Perret <quentin.perret@arm.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Todd Kjos <tkjos@google.com>,
        Joel Fernandes <joelaf@google.com>,
        Steve Muckle <smuckle@google.com>,
        Suren Baghdasaryan <surenb@google.com>
Subject: Re: [PATCH v7 03/15] sched/core: uclamp: Add system default clamps
Message-ID: <20190318131050.GQ6058@hirez.programming.kicks-ass.net>
References: <20190208100554.32196-1-patrick.bellasi@arm.com>
 <20190208100554.32196-4-patrick.bellasi@arm.com>
 <20190313201821.GW2482@worktop.programming.kicks-ass.net>
 <20190318121804.tr3myhtgczvovmkq@e110439-lin>
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On Mon, Mar 18, 2019 at 12:18:04PM +0000, Patrick Bellasi wrote:
> On 13-Mar 21:18, Peter Zijlstra wrote:
> > On Fri, Feb 08, 2019 at 10:05:42AM +0000, Patrick Bellasi wrote:
> > > +static void uclamp_fork(struct task_struct *p)
> > > +{
> > > +	unsigned int clamp_id;
> > > +
> > > +	if (unlikely(!p->sched_class->uclamp_enabled))
> > > +		return;
> > > +
> > > +	for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id)
> > > +		p->uclamp[clamp_id].active = false;
> > > +}
> > 
> > Because in that case .active == false, and copy_process() will have done
> > thr right thing?
> 
> Don't really get what you mean here? :/

Why don't we have to set .active=false when
!sched_class->uclamp_enabled?