linux-kernel - Re: [PATCH] irqchip: bcm2836: Use a CPU notifier enable IPIs.

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Message-ID: <alpine.DEB.2.11.1508040913490.3959@nanos>
Date:	Tue, 4 Aug 2015 09:14:34 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Eric Anholt <eric@...olt.net>
cc:	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Lee Jones <lee@...nel.org>, devicetree@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH] irqchip: bcm2836: Use a CPU notifier enable IPIs.

On Mon, 3 Aug 2015, Eric Anholt wrote:

> Thomas Gleixner <tglx@...utronix.de> writes:
> 
> > On Mon, 27 Jul 2015, Eric Anholt wrote:
> >> +/* Unmasks the IPI on the CPU wen it's first brought online. */
> >
> > when
> >
> >> +static int bcm2836_arm_irqchip_cpu_notify(struct notifier_block *nfb,
> >> +					  unsigned long action, void *hcpu)
> >> +{
> >> +	unsigned int cpu = (unsigned long)hcpu;
> >> +	unsigned int int_reg = LOCAL_MAILBOX_INT_CONTROL0;
> >> +	unsigned int mailbox = 0;
> >> +
> >> +	if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
> >> +		bcm2836_arm_irqchip_unmask_per_cpu_irq(int_reg, mailbox, cpu);
> >
> > Shouldn't you mask the irq on CPU_DYING?
> 
> I was just following what other drivers were doing.  Is CPU_DYING the
> only thing that needs masking?

CPPU_DYING is the counterpart of CPU_STARTING. It's called from the
CPU which goes down.

Thanks,

	tglx

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