* Yajun Deng <yajun.deng@xxxxxxxxx> [240124 22:49]:
> These vma_merge() callers will pass mm, anon_vma and file, they all from
> the same vma. There is no need to pass three parameters at the same time.
>
> Pass vma instead of mm, anon_vma and file to vma_merge(), so that it can
> save two parameters.
>
> Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx>
Thanks for splitting these up.
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
> ---
> mm/mmap.c | 27 +++++++++++++--------------
> 1 file changed, 13 insertions(+), 14 deletions(-)
>
> diff --git a/mm/mmap.c b/mm/mmap.c
> index 49d25172eac8..f19bc53bc08e 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -860,13 +860,15 @@ can_vma_merge_after(struct vm_area_struct *vma, unsigned long vm_flags,
> * area is returned, or the function will return NULL
> */
> static struct vm_area_struct
> -*vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
> - struct vm_area_struct *prev, unsigned long addr, unsigned long end,
> - unsigned long vm_flags, struct anon_vma *anon_vma, struct file *file,
> - pgoff_t pgoff, struct mempolicy *policy,
> +*vma_merge(struct vma_iterator *vmi, struct vm_area_struct *prev,
> + struct vm_area_struct *src, unsigned long addr, unsigned long end,
> + unsigned long vm_flags, pgoff_t pgoff, struct mempolicy *policy,
> struct vm_userfaultfd_ctx vm_userfaultfd_ctx,
> struct anon_vma_name *anon_name)
> {
> + struct mm_struct *mm = src->vm_mm;
> + struct anon_vma *anon_vma = src->anon_vma;
> + struct file *file = src->vm_file;
> struct vm_area_struct *curr, *next, *res;
> struct vm_area_struct *vma, *adjust, *remove, *remove2;
> struct vm_area_struct *anon_dup = NULL;
> @@ -2424,9 +2426,8 @@ struct vm_area_struct *vma_modify(struct vma_iterator *vmi,
> pgoff_t pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT);
> struct vm_area_struct *merged;
>
> - merged = vma_merge(vmi, vma->vm_mm, prev, start, end, vm_flags,
> - vma->anon_vma, vma->vm_file, pgoff, policy,
> - uffd_ctx, anon_name);
> + merged = vma_merge(vmi, prev, vma, start, end, vm_flags,
> + pgoff, policy, uffd_ctx, anon_name);
> if (merged)
> return merged;
>
> @@ -2456,9 +2457,8 @@ static struct vm_area_struct
> struct vm_area_struct *vma, unsigned long start,
> unsigned long end, pgoff_t pgoff)
> {
> - return vma_merge(vmi, vma->vm_mm, prev, start, end, vma->vm_flags,
> - vma->anon_vma, vma->vm_file, pgoff, vma_policy(vma),
> - vma->vm_userfaultfd_ctx, anon_vma_name(vma));
> + return vma_merge(vmi, prev, vma, start, end, vma->vm_flags, pgoff,
> + vma_policy(vma), vma->vm_userfaultfd_ctx, anon_vma_name(vma));
> }
>
> /*
> @@ -2472,10 +2472,9 @@ struct vm_area_struct *vma_merge_extend(struct vma_iterator *vmi,
> pgoff_t pgoff = vma->vm_pgoff + vma_pages(vma);
>
> /* vma is specified as prev, so case 1 or 2 will apply. */
> - return vma_merge(vmi, vma->vm_mm, vma, vma->vm_end, vma->vm_end + delta,
> - vma->vm_flags, vma->anon_vma, vma->vm_file, pgoff,
> - vma_policy(vma), vma->vm_userfaultfd_ctx,
> - anon_vma_name(vma));
> + return vma_merge(vmi, vma, vma, vma->vm_end, vma->vm_end + delta,
> + vma->vm_flags, pgoff, vma_policy(vma),
> + vma->vm_userfaultfd_ctx, anon_vma_name(vma));
> }
>
> /*
> --
> 2.25.1
>
