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

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Message-ID: <20140510214212.GA26308@ubuette>
Date:	Sat, 10 May 2014 14:42:12 -0700
From:	Larry Bassel <larry.bassel@...aro.org>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Larry Bassel <larry.bassel@...aro.org>,
	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 09 May 14 16:57, Catalin Marinas wrote:
> 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?

I will look into this. Thanks.

> 
> -- 
> Catalin

Larry
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