linux-kernel - Re: [PATCH -v2 08/17] sched: Massage set_cpus

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Message-ID: <jhjy2kjmwik.mognet@arm.com>
Date:   Tue, 06 Oct 2020 12:20:03 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
        bigeasy@...utronix.de, qais.yousef@....com, swood@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vincent.donnefort@....com,
        tj@...nel.org
Subject: Re: [PATCH -v2 08/17] sched: Massage set_cpus_allowed()


On 05/10/20 15:57, Peter Zijlstra wrote:
> Thread a u32 flags word through the *set_cpus_allowed*() callchain.
> This will allow adding behavioural tweaks for future users.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
[...]
> @@ -1899,7 +1900,9 @@ extern void update_group_capacity(struct
>
>  extern void trigger_load_balance(struct rq *rq);
>
> -extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask);
> +#define SCA_CHECK		0x01
> +

That most likely needs to live outside of the #define CONFIG_SMP, so this
should be hoisted up - you already do that in the next patch, this should
be done here.

> +extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask, u32 flags);
>
>  #endif
>