find_vma_prev
vma = find_vma_prev(mm, addr, &prev);
vma = find_vma_prev(mm, address, &prev_vma);
extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr,
vma = find_vma_prev(mm, range->start, &prev);
vma = find_vma_prev(mm, addr, &prev);
vma = find_vma_prev(mm, addr, &prev);
vma = find_vma_prev(mm, addr, &prev);
vma = find_vma_prev(mm, addr, &prev);
new_vma = find_vma_prev(mm, addr, &vmg.prev);