linux-kernel - Re: [PATCH] powerpc/mm: Code cleanup for __hash_page

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Date: Tue, 27 Feb 2024 17:07:36 +1100
From: Michael Ellerman <mpe@...erman.id.au>
To: Kunwu Chan <chentao@...inos.cn>, npiggin@...il.com,
 christophe.leroy@...roup.eu, aneesh.kumar@...nel.org,
 naveen.n.rao@...ux.ibm.com
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/mm: Code cleanup for __hash_page_thp

Kunwu Chan <chentao@...inos.cn> writes:
> Thanks for the reply.
>
> On 2024/2/26 18:49, Michael Ellerman wrote:
>> Kunwu Chan <chentao@...inos.cn> writes:
>>> This part was commented from commit 6d492ecc6489
>>> ("powerpc/THP: Add code to handle HPTE faults for hugepages")
>>> in about 11 years before.
>>>
>>> If there are no plans to enable this part code in the future,
>>> we can remove this dead code.
>> 
>> I agree the code can go. But I'd like it to be replaced with a comment
>> explaining what the dead code was trying to say.

> Thanks, i'll update a new patch with the following comment:
>      /*
>      * No CPU has hugepages but lacks no execute, so we
>      * don't need to worry about cpu no CPU_FTR_COHERENT_ICACHE feature case
>      */

Maybe wait until we can get some input from Aneesh. I'm not sure the
code/comment are really up to date.

cheers