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

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Date: Mon, 15 Apr 2024 12:06:26 -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 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