linux-kernel - Re: [PATCH v2] mm/hugetlb: Remove unnecessary VM_BUG_ON_PAGE on putback_active

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Message-ID: <5eb05d5c-8bfc-8306-d767-0a0fc842fb46@oracle.com>
Date:   Tue, 9 Feb 2021 10:18:15 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Miaohe Lin <linmiaohe@...wei.com>, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/hugetlb: Remove unnecessary VM_BUG_ON_PAGE on
 putback_active_hugepage()

On 2/8/21 11:11 PM, Miaohe Lin wrote:
> All callers know they are operating on a hugetlb head page. So this
> VM_BUG_ON_PAGE can not catch anything useful.
> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/hugetlb.c | 1 -
>  1 file changed, 1 deletion(-)

Thanks,
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz

> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 06719fdf9fd6..cfa06fd1b8d7 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -5577,7 +5577,6 @@ bool isolate_huge_page(struct page *page, struct list_head *list)
>  
>  void putback_active_hugepage(struct page *page)
>  {
> -	VM_BUG_ON_PAGE(!PageHead(page), page);
>  	spin_lock(&hugetlb_lock);
>  	SetHPageMigratable(page);
>  	list_move_tail(&page->lru, &(page_hstate(page))->hugepage_activelist);
>