linux-kernel - Re: [PATCH v4 2/6] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page

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Date:   Wed, 13 Jan 2021 12:00:51 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     mike.kravetz@...cle.com, akpm@...ux-foundation.org,
        n-horiguchi@...jp.nec.com, ak@...ux.intel.com, mhocko@...e.cz,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Michal Hocko <mhocko@...e.com>, stable@...r.kernel.org
Subject: Re: [PATCH v4 2/6] mm: hugetlbfs: fix cannot migrate the fallocated
 HugeTLB page

On Wed, Jan 13, 2021 at 01:22:05PM +0800, Muchun Song wrote:
> If a new hugetlb page is allocated during fallocate it will not be
> marked as active (set_page_huge_active) which will result in a later
> isolate_huge_page failure when the page migration code would like to
> move that page. Such a failure would be unexpected and wrong.
> 
> Only export set_page_huge_active, just leave clear_page_huge_active
> as static. Because there are no external users.
> 
> Fixes: 70c3547e36f5 (hugetlbfs: add hugetlbfs_fallocate())
> Signed-off-by: Muchun Song <songmuchun@...edance.com>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
> Cc: stable@...r.kernel.org

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

-- 
Oscar Salvador
SUSE L3