linux-kernel - Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be restricted on asymmetric systems

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Message-ID: <YRvYtlyhuRpFi/Th@hirez.programming.kicks-ass.net>
Date:   Tue, 17 Aug 2021 17:41:42 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Qais Yousef <qais.yousef@....com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Quentin Perret <qperret@...gle.com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mark Rutland <mark.rutland@....com>, kernel-team@...roid.com
Subject: Re: [PATCH v11 08/16] sched: Allow task CPU affinity to be
 restricted on asymmetric systems

On Fri, Jul 30, 2021 at 12:24:35PM +0100, Will Deacon wrote:
> +	struct rq_flags rf;
> +	struct rq *rq;
> +	int err;
> +	struct cpumask *user_mask = NULL;

> +	cpumask_var_t new_mask;
> +	const struct cpumask *override_mask = task_cpu_possible_mask(p);

> +	unsigned long flags;
> +	struct cpumask *mask = p->user_cpus_ptr;

I've fixed all that up to be proper reverse x-mas trees; similar for
other patches.