linux-kernel - Re: [PATCH v2] arm64: Support arch_irq_work

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Message-ID: <20140512092956.GB914@arm.com>
Date:	Mon, 12 May 2014 10:29:56 +0100
From:	Will Deacon <will.deacon@....com>
To:	Larry Bassel <larry.bassel@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....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 v2] arm64: Support arch_irq_work_raise() via self IPIs

On Sat, May 10, 2014 at 11:23:41PM +0100, Larry Bassel wrote:
> Support for arch_irq_work_raise() was missing from
> arm64 (a prerequisite for FULL_NOHZ).

[...]

> @@ -455,6 +457,14 @@ void arch_send_call_function_single_ipi(int cpu)
>  	smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
>  }
>  
> +#ifdef CONFIG_IRQ_WORK
> +void arch_irq_work_raise(void)
> +{
> +	if (is_smp())
> +		smp_cross_call(cpumask_of(smp_processor_id()), IPI_IRQ_WORK);
> +}
> +#endif

Does this even compile? We're probably better off just checking whether or
not smp_cross_call is NULL.

Will
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