linux-kernel - Re: [PATCH V2] irqchip/loongson-eiointc: Use early_cpu_to_node() instead of cpu_to

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Date: Sat, 22 Jun 2024 10:49:50 +0800
From: Huacai Chen <chenhuacai@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Huacai Chen <chenhuacai@...ngson.cn>, loongarch@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>, 
	Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: Re: [PATCH V2] irqchip/loongson-eiointc: Use early_cpu_to_node()
 instead of cpu_to_node()

Hi, Thomas,

On Sat, Jun 22, 2024 at 4:42 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Thu, Jun 20 2024 at 10:06, Huacai Chen wrote:
> > When we use "nr_cpus=n" to hard limit the CPU number, cpu_to_node() is
> > not usable because it can only applied on "possible" CPUs. On the other
> > hand, early_cpu_to_node() can be always used instead.
cpu_to_node() depends on per-cpu area, and per-cpu area is only usable
for "possible" CPUs.

>
> We use nothing...
>
> Aside of that you fail to explain what the problem is (i.e. the
> malfunction) and why using early_cpu_to_node() is fixing it.
>
> >  #define pr_fmt(fmt) "eiointc: " fmt
> >
> > +#include <asm/numa.h>
>
> asm includes come after the linux includes.
>
> >  #include <linux/cpuhotplug.h>
OK, will modify in the next version.

Huacai

>
> Thanks,
>
>         tglx