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Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu() for cpu hotplug

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  Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu()  for cpu hotplug Thomas Gleixner <tglx@linutronix.de> - 2015-09-22 21:00 +0200
    Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu() for  cpu hotplug Yang Yingliang <yangyingliang@huawei.com> - 2015-09-23 06:20 +0200
      Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu()  for cpu hotplug Thomas Gleixner <tglx@linutronix.de> - 2015-09-23 10:10 +0200

#1230772 — Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu() for cpu hotplug

On Sat, 19 Sep 2015, Yang Yingliang wrote:

> Add irq_migrate_all_off_this_cpu() into kernel/irq/migration.c.

This doesn't make any sense at all. 

You just reuse the existing file to stick your new code into it
without reusing a single bit in that file. Aside of that it's
unconditionally compiled, which means all existing users of
CONFIG_GENERIC_PENDING_IRQ are burdened with pointless code.

The right thing to do is:

Add that code to a new file: kernel/irq/cpuhotplug.c and make that
depend on CONFIG_GENERIC_IRQ_MIGRATION.

Thanks,

	tglx


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#1231129 — Re: [RFC PATCH v5 2/4] genirq: add irq_migrate_all_off_this_cpu() for cpu hotplug

On 2015/9/23 2:54, Thomas Gleixner wrote:
> On Sat, 19 Sep 2015, Yang Yingliang wrote:
>
>> Add irq_migrate_all_off_this_cpu() into kernel/irq/migration.c.
>
> This doesn't make any sense at all.
>
> You just reuse the existing file to stick your new code into it
> without reusing a single bit in that file. Aside of that it's
> unconditionally compiled, which means all existing users of
> CONFIG_GENERIC_PENDING_IRQ are burdened with pointless code.
>
> The right thing to do is:
>
> Add that code to a new file: kernel/irq/cpuhotplug.c and make that
> depend on CONFIG_GENERIC_IRQ_MIGRATION.

How about add #ifdef CONFIG_CPU_HOTPLUG around new code
in kernel/irq/migration.c ?

Thanks,
Yang


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#1231216

On Wed, 23 Sep 2015, Yang Yingliang wrote:
> On 2015/9/23 2:54, Thomas Gleixner wrote:
> > On Sat, 19 Sep 2015, Yang Yingliang wrote:
> > 
> > > Add irq_migrate_all_off_this_cpu() into kernel/irq/migration.c.
> > 
> > This doesn't make any sense at all.
> > 
> > You just reuse the existing file to stick your new code into it
> > without reusing a single bit in that file. Aside of that it's
> > unconditionally compiled, which means all existing users of
> > CONFIG_GENERIC_PENDING_IRQ are burdened with pointless code.
> > 
> > The right thing to do is:
> > 
> > Add that code to a new file: kernel/irq/cpuhotplug.c and make that
> > depend on CONFIG_GENERIC_IRQ_MIGRATION.
> 
> How about add #ifdef CONFIG_CPU_HOTPLUG around new code
> in kernel/irq/migration.c ?

What's the point? Just to have useless churn and ifdeffery in that
file for nothing?

Thanks,

	tglx


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