linux-kernel - Re: [PATCH v2 1/2] mm/gup.c: Don't pass gup_flags to check_and_migrate_movable

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Message-ID: <cb695e26-350a-0857-5430-b7e4f81607b1@redhat.com>
Date:   Fri, 5 Aug 2022 10:10:20 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Alistair Popple <apopple@...dia.com>, linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        "Sierra Guiza, Alejandro (Alex)" <alex.sierra@....com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Muchun Song <songmuchun@...edance.com>,
        Ralph Campbell <rcampbell@...dia.com>
Subject: Re: [PATCH v2 1/2] mm/gup.c: Don't pass gup_flags to
 check_and_migrate_movable_pages()

On 05.08.22 08:29, Alistair Popple wrote:
> gup_flags is passed to check_and_migrate_movable_pages() so that it can
> call either put_page() or unpin_user_page() to drop the page reference.
> However check_and_migrate_movable_pages() is only called for
> FOLL_LONGTERM, which implies FOLL_PIN so there is no need to pass
> gup_flags.
> 
> Signed-off-by: Alistair Popple <apopple@...dia.com>
> ---
>  mm/gup.c | 21 ++++++++-------------
>  1 file changed, 8 insertions(+), 13 deletions(-)

Reviewed-by: David Hildenbrand <david@...hat.com>


-- 
Thanks,

David / dhildenb