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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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