linux-kernel - Re: [PATCH] arm64: Support arch_irq_work

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Date:	Fri, 9 May 2014 16:57:26 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Larry Bassel <larry.bassel@...aro.org>
Cc:	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"khilman@...aro.org" <khilman@...aro.org>
Subject: Re: [PATCH] arm64: Support arch_irq_work_raise() via self IPIs

On Mon, May 05, 2014 at 09:48:27PM +0100, Larry Bassel wrote:
> Support for arch_irq_work_raise() was missing from
> arm64 (a prerequisite for FULL_NOHZ).
> 
> This patch is based on the arm32 patch ARM 7872/1
> which ports cleanly.
[...]
> +#ifdef CONFIG_IRQ_WORK
> +void arch_irq_work_raise(void)
> +{
> +	smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
> +}
> +#endif

There was a subsequent patch adding is_smp() check here (c682e51dbc98
ARM: 7887/1: Don't smp_cross_call() on UP devices in
arch_irq_work_raise()). Don't we need it?

-- 
Catalin
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