linux-kernel - Re: [RFC PATCH v4 2/4] genirq: add move

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Message-ID: <55FAEDF6.6060000@arm.com>
Date:	Thu, 17 Sep 2015 17:44:38 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Yang Yingliang <yangyingliang@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
CC:	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 v4 2/4] genirq: add move_irqs() for cpu hotplug

On 17/09/15 06:19, Yang Yingliang wrote:
> Add move_irqs() into kernel/irq/migration.c.
> So we can use it to migrate interrupts, when
> cpu is offline.
> 
> 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>
> ---
>  include/linux/irq.h    |  4 +++
>  kernel/irq/migration.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 70 insertions(+)
> 
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index 6f8b340..64e3a02 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -446,6 +446,10 @@ static inline void irq_move_irq(struct irq_data *data) { }
>  static inline void irq_move_masked_irq(struct irq_data *data) { }
>  #endif
>  
> +#if defined(CONFIG_SMP) && defined(CONFIG_GENERIC_IRQ_MIGRATION) && defined(CONFIG_HOTPLUG_CPU)
> +void move_irqs(void);
> +#endif
> +

I don't think having this prototype guarded by this #if is very useful.
You can probably leave it standalone.

Thanks,

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