linux-kernel - Re: [PATCH] replace free hugepage folios after migration

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Message-Id: <20241219184301.63011-1-sj@kernel.org>
Date: Thu, 19 Dec 2024 10:43:01 -0800
From: SeongJae Park <sj@...nel.org>
To: yangge1116@....com
Cc: SeongJae Park <sj@...nel.org>,
	akpm@...ux-foundation.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	21cnbao@...il.com,
	david@...hat.com,
	baolin.wang@...ux.alibaba.com,
	muchun.song@...ux.dev,
	liuzixing@...on.cn
Subject: Re: [PATCH] replace free hugepage folios after migration

Hello,

On Wed, 18 Dec 2024 14:33:08 +0800 yangge1116@....com wrote:

[...]
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index ae4fe86..7d36ac8 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -681,6 +681,7 @@ struct huge_bootmem_page {
>  };
>  
>  int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
> +int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn);
>  struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
>  				unsigned long addr, int avoid_reserve);
>  struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
> @@ -1059,6 +1060,11 @@ static inline int isolate_or_dissolve_huge_page(struct page *page,
>  	return -ENOMEM;
>  }
>  
> +int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn)
> +{
> +	return 0;
> +}
> +

I think this should be static inline.  Otherwise, build fails when
CONFIG_HUGETLB_PAGE is unset.  Since this is already merged into mm-unstable
and the problem and fix seems straigthforward, I directly sent my fix:
https://lore.kernel.org/20241219183753.62922-1-sj@kernel.org


Thanks,
SJ

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