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> --- v3: resend the first patch again alone. v2: split it into two patches. v1: https://lore.kernel.org/all/20240118082312.2801992-1-yajun.deng@xxxxxxxxx/ --- mm/mmap.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 485a6e1e4226..8f176027583c 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; @@ -2426,9 +2428,8 @@ 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; @@ -2458,9 +2459,8 @@ 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)); } /* @@ -2474,10 +2474,9 @@ 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
