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

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Date:   Thu, 11 Feb 2021 09:12:14 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        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 Tue, Feb 09, 2021 at 02:11:51AM -0500, 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>

Reviewed-by: Oscar Salvador <osalvador@...e.de>

> ---
>  mm/hugetlb.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> 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);
> -- 
> 2.19.1
> 
> 

-- 
Oscar Salvador
SUSE L3