linux-kernel - Re: [PATCH v2 1/2] mm/hugetlb: convert dissolve_free_huge

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Date: Mon, 15 Apr 2024 12:14:09 -0700
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: Vishal Moola <vishal.moola@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, willy@...radead.org, linmiaohe@...wei.com,
        jane.chu@...cle.com, muchun.song@...ux.dev, nao.horiguchi@...il.com,
        osalvador@...e.de
Subject: Re: [PATCH v2 1/2] mm/hugetlb: convert dissolve_free_huge_pages() to
 folios

On 4/15/24 12:06 PM, Sidhartha Kumar wrote:
> On 4/15/24 11:28 AM, Vishal Moola wrote:
>> On Fri, Apr 12, 2024 at 11:21:38AM -0700, Sidhartha Kumar wrote:
>>> Allows us to rename dissolve_free_huge_pages() to
>>> dissolve_free_hugetlb_folio(). Convert one caller to pass in a folio
>>> directly and use page_folio() to convert the caller in mm/memory-failure.
>>>
>>> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
>>> Reviewed-by: Oscar Salvador <osalvador@...e.de>
>>> ---
>>>
>>> v1 -> v2:
>>>     - Change additional comments which reference hugepages to
>>>       hugetlb folios per Miaohe Lin.
>>>     - introduce patch 2
>>>
>>>   include/linux/hugetlb.h |  4 ++--
>>>   mm/hugetlb.c            | 17 ++++++++---------
>>>   mm/memory-failure.c     |  8 ++++----
>>>   3 files changed, 14 insertions(+), 15 deletions(-)
>>>
>>> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
>>> index 3f3e628802792..f4191b10345d6 100644
>>> --- a/include/linux/hugetlb.h
>>> +++ b/include/linux/hugetlb.h
>>> @@ -861,7 +861,7 @@ static inline int hstate_index(struct hstate *h)
>>>       return h - hstates;
>>>   }
>>> -extern int dissolve_free_huge_page(struct page *page);
>>> +extern int dissolve_free_hugetlb_folio(struct folio *folio);
>>
>> You could drop the extern here as we don't need it anymore. Aside from that
>> LGTM.
>>
>> Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
>>
> Hi Andrew,
> 
> Could this diff be folded in this patch to remove the extern per Vishal.
> 
> Thanks,
> Sid
> 
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index f4191b10345d6..4cd7895590b6c 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -862,7 +862,7 @@ static inline int hstate_index(struct hstate *h)
>   }
> 
>   extern int dissolve_free_hugetlb_folio(struct folio *folio);
> -extern int dissolve_free_huge_pages(unsigned long start_pfn,
> +int dissolve_free_huge_pages(unsigned long start_pfn,
>                                      unsigned long end_pfn);
> 
>   #ifdef CONFIG_MEMORY_FAILURE
> 

Sorry, that diff is wrong, it should be:

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index f4191b10345d6..8968e8a3a205d 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -861,7 +861,7 @@ static inline int hstate_index(struct hstate *h)
         return h - hstates;
  }

-extern int dissolve_free_hugetlb_folio(struct folio *folio);
+int dissolve_free_hugetlb_folio(struct folio *folio);
  extern int dissolve_free_huge_pages(unsigned long start_pfn,
                                     unsigned long end_pfn);