linux-kernel - Re: [PATCH v2 2/4] mm/fork: Pass new vma pointer into copy_page

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Date:   Wed, 30 Sep 2020 16:30:55 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Jason Gunthorpe <jgg@...pe.ca>,
        John Hubbard <jhubbard@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, Yang Shi <shy828301@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Hugh Dickins <hughd@...gle.com>, Jann Horn <jannh@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>, Jan Kara <jack@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>
Subject: Re: [PATCH v2 2/4] mm/fork: Pass new vma pointer into
 copy_page_range()

On Fri, Sep 25, 2020 at 06:25:58PM -0400, Peter Xu wrote:
> This prepares for the future work to trigger early cow on pinned pages during
> fork().  No functional change intended.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  include/linux/mm.h |  2 +-
>  kernel/fork.c      |  2 +-
>  mm/memory.c        | 14 +++++++++-----
>  3 files changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index b2f370f0b420..ae914be004b3 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1646,7 +1646,7 @@ struct mmu_notifier_range;
>  void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
>  		unsigned long end, unsigned long floor, unsigned long ceiling);
>  int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
> -			struct vm_area_struct *vma);
> +		    struct vm_area_struct *vma, struct vm_area_struct *new);

It makes dst/src mm_struct arguments redundant. There's always vma->vm_mm.

-- 
 Kirill A. Shutemov