linux-kernel - Re: [RFC PATCH v5 0/4] arm/arm64: fix a migrating irq bug when hotplug cpu

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Date:	Tue, 22 Sep 2015 19:34:07 +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 v5 0/4] arm/arm64: fix a migrating irq bug when
 hotplug cpu

On Sat, Sep 19, 2015 at 04:05:55AM +0100, Yang Yingliang wrote:
> ----
> Changes in v5:
>  - remove the macro that guard move_irqs()
>  - use name irq_migrate_all_off_this_cpu instead of move_irqs
> 
> Changes in v4:
>  - select GENERIC_IRQ_MIGRATION when config GENERIC_IRQ_MIGRATION is enabled
>  - add move_irqs() into kerne/irq/migration.c for cpu hotplug
>  - use move_irqs() to migrate interrupts on arm/arm64 when cpu is going to down
>  - split bugfix patch into seperate patches for arm and arm64
> 
> Changes in v3:
>  - introduce config GENERIC_IRQ_MIGRATION for compiling migration.c
>  - rename migrate_irqs in arch/ia64/kernel/irq.c to avoid compiling error
> 
> Changes in v2:
>  - use the exiting helper to set IRQD_MOVE_PCNTXT flag
>  - use for_each_active_irq() instead of for_each_irq_desc()
>  - add some warn messages when affinity is null or do set affinity failed
> ----
> 
> Hi All,
> 
> There is a bug:
> 
> 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.

This series looks good to me:

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

Marc: once you're happy with the irq/core changes, feel free to include
the arm64 patch in your tree.

Will
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