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Date: Thu, 10 Sep 2026 15:39:00 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Andrea Righi <arighi@nvidia.com>
Cc: Tejun Heo <tj@kernel.org>, David Vernet <void@manifault.com>,
	Changwoo Min <changwoo@igalia.com>,
	John Stultz <jstultz@google.com>, Ingo Molnar <mingo@redhat.com>,
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	Dietmar Eggemann <dietmar.eggemann@arm.com>,
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	Christian Loehle <christian.loehle@arm.com>,
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	Koba Ko <kobak@nvidia.com>, Aiqun Yu <aiqun.yu@oss.qualcomm.com>,
	sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 15/18] sched_ext: Delegate proxy donor admission to BPF
 schedulers
Message-ID: <20260910133900.GT776954@noisy.programming.kicks-ass.net>
References: <20260831134338.1531664-1-arighi@nvidia.com>
 <20260831134338.1531664-16-arighi@nvidia.com>
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In-Reply-To: <20260831134338.1531664-16-arighi@nvidia.com>

On Mon, Aug 31, 2026 at 03:42:25PM +0200, Andrea Righi wrote:

> diff --git a/kernel/sched/ext/ext.c b/kernel/sched/ext/ext.c
> index 5f4956cf7e369..aa6ba9e8d7cb0 100644
> --- a/kernel/sched/ext/ext.c
> +++ b/kernel/sched/ext/ext.c
> @@ -26,7 +26,28 @@ DEFINE_RAW_SPINLOCK(scx_sched_lock);
>  
>  bool scx_allow_proxy_exec(const struct task_struct *p)
>  {
> -	return p->sched_class != &ext_sched_class;
> +	struct scx_sched *sch;
> +
> +	if (p->sched_class != &ext_sched_class)
> +		return true;
> +
> +	sch = scx_task_sched(p);
> +	return !sch || (sch->ops.flags & SCX_OPS_ENQ_BLOCKED);
> +}

Can we have this thing either be inline or wrapped in an inline function
that has scx_enabled() on?