linux-kernel - Re: [PATCH 3/5] irq_work: Implement remote queueing

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Message-ID: <20140526160224.GM30445@twins.programming.kicks-ass.net>
Date:	Mon, 26 May 2014 18:02:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Kevin Hilman <khilman@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH 3/5] irq_work: Implement remote queueing

On Sun, May 25, 2014 at 04:29:49PM +0200, Frederic Weisbecker wrote:
> +bool irq_work_queue_on(struct irq_work *work, int cpu)
> +{
> +	/* Only queue if not already pending */
> +	if (!irq_work_claim(work))
> +		return false;
> +
> +	/* All work should have been flushed before going offline */
> +	WARN_ON_ONCE(cpu_is_offline(cpu));
	WARN_ON_ONCE(in_nmi());


Also, I would do both these checks before the claim thing.

> +
> +	if (llist_add(&work->llnode, &per_cpu(raised_list, cpu)))
> +		native_send_call_func_single_ipi(cpu);
> +
> +	return true;
> +}
> +EXPORT_SYMBOL_GPL(irq_work_queue_on);



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