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Date: Wed, 7 Oct 2015 15:24:03 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org,
        Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Rik van Riel <riel@redhat.com>
Subject: Re: [RFC][PATCH] sched: Start stopper early
Message-ID: <20151007132403.GA24924@redhat.com>
References: <20151007084110.GX2881@worktop.programming.kicks-ass.net> <20151007123046.GA21460@redhat.com> <20151007123852.GH17308@twins.programming.kicks-ass.net> <20151007132007.GA24540@redhat.com>
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Damn sorry for noise ;)

On 10/07, Oleg Nesterov wrote:
>
> +void stop_machine_park(int cpu)
> +{
> +	struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
> +
> +	spin_lock(&stopper->lock);
> +	stopper->enabled = false;
> +	spin_unlock(&stopper->lock);

Of course, it should also do kthread_park(current).

Oleg.