linux-kernel - Re: [RFC PATCH v4 3/4] arm64: fix a migrating irq bug when hotplug cpu

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Message-ID: <20150917160107.GO25634@arm.com>
Date:	Thu, 17 Sep 2015 17:01:07 +0100
From:	Will Deacon <will.deacon@....com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Mark Rutland <Mark.Rutland@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>
Subject: Re: [RFC PATCH v4 3/4] arm64: fix a migrating irq bug when hotplug
 cpu

On Thu, Sep 17, 2015 at 06:19:25AM +0100, Yang Yingliang 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.
> 
> And migrating interrupts is a core code matter, so use the generic
> function move_irqs() 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>
> ---
>  arch/arm64/Kconfig           |  1 +
>  arch/arm64/include/asm/irq.h |  1 -
>  arch/arm64/kernel/irq.c      | 62 --------------------------------------------
>  arch/arm64/kernel/smp.c      |  2 +-
>  4 files changed, 2 insertions(+), 64 deletions(-)

Removing code is always good, so:

  Acked-by: Will Deacon <will.deacon@....com>

but obviously this depends on the core stuff.

Will
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