linux-kernel - Re: [PATCH 3.18-rc3 v8 1/4] irqchip: gic: Make gic_raise

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Message-ID: <alpine.DEB.2.11.1411242139240.6439@nanos>
Date:	Mon, 24 Nov 2014 21:41:00 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Daniel Thompson <daniel.thompson@...aro.org>
cc:	Jason Cooper <jason@...edaemon.net>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	patches@...aro.org, linaro-kernel@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Daniel Drake <drake@...lessm.com>,
	Dmitry Pervushin <dpervushin@...il.com>,
	Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH 3.18-rc3 v8 1/4] irqchip: gic: Make gic_raise_softirq()
 FIQ-safe

On Mon, 24 Nov 2014, Daniel Thompson wrote:
> I did want to remove the lock too. However when I reviewed this code I
> concluded the lock was still required. Without it I think it is possible
> for gic_raise_softirq() to raise an IPI on the old core *after* the code
> to migrate pending IPIs has been run.

And I bet it took you quite some time to figure that out from that
overly documented abuse of irq_controller_lock. See my other reply.

Thanks,

	tglx
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