linux-kernel - Re: [PATCH] NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id

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Date: Fri, 19 Jan 2024 15:42:08 +0800
From: Shijie Huang <shijie@...eremail.onmicrosoft.com>
To: Yury Norov <yury.norov@...il.com>,
 Huang Shijie <shijie@...amperecomputing.com>
Cc: gregkh@...uxfoundation.org, patches@...erecomputing.com,
 rafael@...nel.org, paul.walmsley@...ive.com, palmer@...belt.com,
 aou@...s.berkeley.edu, kuba@...nel.org, vschneid@...hat.com,
 mingo@...nel.org, akpm@...ux-foundation.org, vbabka@...e.cz,
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 linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
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 jiaxun.yang@...goat.com, linux-mips@...r.kernel.org,
 cl@...amperecomputing.com
Subject: Re: [PATCH] NUMA: Early use of cpu_to_node() returns 0 instead of the
 correct node id


在 2024/1/19 12:42, Yury Norov 写道:
> Regardless, I don't think that the approach is correct. As per your
> description, some initialization functions erroneously call
> cpu_to_node() instead of early_cpu_to_node() which exists specifically
> for that case.

I checked the code again.

The sparc, mips and s390 (which support the NUMA) do not support 
early_cpu_to_node().

So we cannot use early_cpu_to_node() for these functions.


Thanks

Huang Shijie