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

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Message-ID: <alpine.DEB.2.11.1509172355260.3951@nanos>
Date:	Fri, 18 Sep 2015 00:04:06 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Marc Zyngier <marc.zyngier@....com>
cc:	Yang Yingliang <yangyingliang@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	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 Thu, 17 Sep 2015, Marc Zyngier wrote:
> 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.

Yes, there is no point if the function name is unique. Though
move_irqs() is rather undescriptive. irq_break_affinities() might
describe it quite well, but feel free to come up with soemthing better.

Thanks,

	tglx


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