linux-kernel - Re: [PATCH v3 2/6] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page

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Date:   Mon, 11 Jan 2021 15:04:43 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Muchun Song <songmuchun@...edance.com>, akpm@...ux-foundation.org
Cc:     n-horiguchi@...jp.nec.com, ak@...ux.intel.com, mhocko@...e.cz,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 2/6] mm: hugetlbfs: fix cannot migrate the fallocated
 HugeTLB page

On 1/10/21 4:40 AM, 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>
> Cc: stable@...r.kernel.org
> ---
>  fs/hugetlbfs/inode.c    | 3 ++-
>  include/linux/hugetlb.h | 2 ++
>  mm/hugetlb.c            | 2 +-
>  3 files changed, 5 insertions(+), 2 deletions(-)

Thanks.

Although page_huge_active is declared in page-flags.h, I much prefer the
declaration of set_page_huge_active to be in hugetlb.c.

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