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Date:	Sat, 14 May 2016 17:29:41 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Xie XiuQi <xiexiuqi@...wei.com>
cc:	hch@...radead.org, linux-kernel@...r.kernel.org,
	huawei.libin@...wei.com, wangyijing@...wei.com
Subject: Re: [PATCH] genirq: export __irq_set_affinity symbol

On Thu, 12 May 2016, Xie XiuQi wrote:

> On 2016/5/12 15:43, Thomas Gleixner wrote:
> > On Thu, 12 May 2016, Xie XiuQi wrote:
> > 
> >> __irq_set_affinity is declared in include/linux/interrupt.h, but not
> >> been exported.
> >>
> >> We export it now, so we could use __irq_set_affinity, irq_set_affinity
> >> and irq_force_affinity in kernel modules.
> > 
> > Please show the code using the exports first. We don't export symbols w/o
> > knowing the usecase.
> 
> The default affinity of the interrupts for all devices is always CPU0,
> this may cause the latency on CPU0 is very high when some interrupt
> occurs very frequently.
> 
> I want to migrate an interrupt to another cpu when the driver loading.

What's wrong with setting the affinity from user space?
 
> My code like this:
> 
> /* I want to bind irq_vector to cpu 3 */

And that CPU 3 is hard coded into the driver? That's just wrong. 

Thanks,

	tglx

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