linux-kernel - Re: [PATCH v2 25/44] mm: Switch vma_merge(), split_vma(), and __split

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Date:   Fri,  6 Jan 2023 17:23:45 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 25/44] mm: Switch vma_merge(), split_vma(), and __split_vma to vma iterator

Hello Liam,

On Thu, 5 Jan 2023 19:15:59 +0000 Liam Howlett <liam.howlett@...cle.com> wrote:

> From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
> 
> Drop the vmi_* functions and transition all users to use the vma
> iterator directly.
> 
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> ---
>  fs/userfaultfd.c   | 14 ++++----
>  include/linux/mm.h | 16 +++-------
>  mm/madvise.c       |  6 ++--
>  mm/mempolicy.c     |  6 ++--
>  mm/mlock.c         |  6 ++--
>  mm/mmap.c          | 79 +++++++++++++---------------------------------
>  mm/mprotect.c      |  6 ++--
>  mm/mremap.c        |  2 +-
>  8 files changed, 47 insertions(+), 88 deletions(-)
[...]
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2830,22 +2830,16 @@ static inline int vma_adjust(struct vm_area_struct *vma, unsigned long start,
[...]
> -extern int vmi__split_vma(struct vma_iterator *vmi, struct mm_struct *,
> -	struct vm_area_struct *, unsigned long addr, int new_below);
> -extern int split_vma(struct mm_struct *, struct vm_area_struct *,
> -	unsigned long addr, int new_below);
> -extern int vmi_split_vma(struct vma_iterator *vmi, struct mm_struct *,
> -		struct vm_area_struct *, unsigned long addr, int new_below);
> +extern int __split_vma(struct vma_iterator *vmi, struct vm_area_struct *,
> +		       unsigned long addr, int new_below);
> +extern int split_vma(struct vma_iterator *vmi, struct vm_area_struct *,
> +			 unsigned long addr, int new_below);

I just found this change for split_vma() is applied to !CONFIG_MMU, which the
definition of split_vma() is not changed, so cause a build error.  I posted a
simple fix for that:
https://lore.kernel.org/linux-mm/20230106171857.149918-1-sj@kernel.org/


Thanks,
SJ

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