linux-kernel - Re: [RFC PATCH v5 3/4] arm64: fix a migrating irq bug when hotplug cpu

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Message-ID: <20150922194456.6b7e65ca@arm.com>
Date:	Tue, 22 Sep 2015 19:44:56 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mark Rutland <mark.rutland@....com>,
	"Will Deacon" <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [RFC PATCH v5 3/4] arm64: fix a migrating irq bug when hotplug
 cpu

On Sat, 19 Sep 2015 11:05:58 +0800
Yang Yingliang <yangyingliang@...wei.com> wrote:

> When cpu is disabled, all irqs will be migratged to another cpu.
> In some cases, a new affinity is different, it needed to be coppied
> to irq's affinity. But if the type of irq is LPI, it's affinity will
> not be coppied because of irq_set_affinity's return value. Fix it by
> using irq_do_set_affinity.

Nit: This hasn't much to do with LPIs proper, but with the fact that
the architecture code only has a partial knowledge of the possible
affinity setting return values.

> And migrating interrupts is a core code matter, so use the generic
> function irq_migrate_all_off_this_cpu() to migrate interrupts in
> kernel/irq/migration.c.
> 
> Cc: Jiang Liu <jiang.liu@...ux.intel.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Russell King - ARM Linux <linux@....linux.org.uk>
> Cc: Hanjun Guo <hanjun.guo@...aro.org>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>

Otherwise Acked-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny.
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