linux-kernel - Re: [PATCH 1/3] sched: add sched_task

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Message-ID: <20150216204436.GH5029@twins.programming.kicks-ass.net>
Date:	Mon, 16 Feb 2015 21:44:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	Seth Jennings <sjenning@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] sched: add sched_task_call()

On Mon, Feb 16, 2015 at 12:52:34PM -0600, Josh Poimboeuf wrote:
> +++ b/kernel/sched/core.c
> @@ -1338,6 +1338,23 @@ void kick_process(struct task_struct *p)
>  EXPORT_SYMBOL_GPL(kick_process);
>  #endif /* CONFIG_SMP */
>  
> +/***
> + * sched_task_call - call a function with a task's state locked
> + *
> + * The task is guaranteed to remain either active or inactive during the
> + * function call.
> + */
> +void sched_task_call(sched_task_call_func_t func, struct task_struct *p,
> +		     void *data)
> +{
> +	unsigned long flags;
> +	struct rq *rq;
> +
> +	rq = task_rq_lock(p, &flags);
> +	func(p, data);
> +	task_rq_unlock(rq, p, &flags);
> +}

Yeah, I think not. We're so not going to allow running random code under
rq->lock and p->pi_lock.

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