13     struct vm_area_struct *vma = (struct vm_area_struct *)kmalloc(sizeof(struct vm_area_struct), 0);  in vm_area_alloc()  local
14     if (vma)  in vm_area_alloc()
15         vma_init(vma, mm);  in vm_area_alloc()
16     return vma;  in vm_area_alloc()
24 void vm_area_del(struct vm_area_struct *vma)  in vm_area_del()  argument
26     if (vma->vm_mm == NULL)  in vm_area_del()
28     __vma_unlink_list(vma->vm_mm, vma);  in vm_area_del()
36 void vm_area_free(struct vm_area_struct *vma)  in vm_area_free()  argument
38     if (vma->vm_prev == NULL && vma->vm_next == NULL) // 如果当前是剩余的最后一个vma  in vm_area_free()
39         vma->vm_mm->vmas = NULL;  in vm_area_free()
40     kfree(vma);  in vm_area_free()
50 void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev)  in __vma_link_list()  argument
53     vma->vm_prev = prev;  in __vma_link_list()
57         prev->vm_next = vma;  in __vma_link_list()
62         mm->vmas = vma;  in __vma_link_list()
65     vma->vm_next = next;  in __vma_link_list()
68         next->vm_prev = vma;  in __vma_link_list()
77 void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma)  in __vma_unlink_list()  argument
80     next = vma->vm_next;  in __vma_unlink_list()
81     prev = vma->vm_prev;  in __vma_unlink_list()
100     struct vm_area_struct *vma = mm->vmas;  in vma_find()  local
102     while (vma != NULL)  in vma_find()
104         if (vma->vm_end > addr)  in vma_find()
106             result = vma;  in vma_find()
109         vma = vma->vm_next;  in vma_find()
121 int vma_insert(struct mm_struct *mm, struct vm_area_struct *vma)  in vma_insert()  argument
126     prev = vma_find(mm, vma->vm_start);  in vma_insert()
128     if (prev && prev->vm_start <= vma->vm_start && prev->vm_end >= vma->vm_end)  in vma_insert()
134 …if (prev && ((vma->vm_start >= prev->vm_start && vma->vm_start <= prev->vm_end) || (prev->vm_start…  in vma_insert()
137 …if ((!CROSS_2M_BOUND(vma->vm_start, prev->vm_start)) && (!CROSS_2M_BOUND(vma->vm_end, prev->vm_end…  in vma_insert()
140 … kdebug("before combining vma:vm_start = %#018lx, vm_end = %#018lx\n", vma->vm_start, vma->vm_end);  in vma_insert()
142             prev->vm_start = (vma->vm_start < prev->vm_start )? vma->vm_start : prev->vm_start;  in vma_insert()
143             prev->vm_end = (vma->vm_end > prev->vm_end) ? vma->vm_end : prev->vm_end;  in vma_insert()
146 …8lx, vm_end = %#018lx\nprev:vm_start = %018lx, vm_end = %018lx\n", vma->vm_start, vma->vm_end, pre…  in vma_insert()
170     __vma_link_list(mm, vma, prev);  in vma_insert()
217 int __anon_vma_add(struct anon_vma_t *anon_vma, struct vm_area_struct *vma)  in __anon_vma_add()  argument
220     list_add(&anon_vma->vma_list, &vma->anon_vma_list);  in __anon_vma_add()
221     vma->anon_vma = anon_vma;  in __anon_vma_add()
252 int __anon_vma_del(struct vm_area_struct *vma)  in __anon_vma_del()  argument
255     if (vma->anon_vma == NULL)  in __anon_vma_del()
258     list_del(&vma->anon_vma_list);  in __anon_vma_del()
259     atomic_dec(&vma->anon_vma->ref_count);  in __anon_vma_del()
262     if (unlikely(atomic_read(&vma->anon_vma->ref_count) == 0)) // 应当释放该anon_vma  in __anon_vma_del()
265         if (vma->anon_vma->page->attr & PAGE_DEVICE)  in __anon_vma_del()
266             kfree(vma->anon_vma->page);  in __anon_vma_del()
268             free_pages(vma->anon_vma->page, 1);  in __anon_vma_del()
269         __anon_vma_free(vma->anon_vma);  in __anon_vma_del()
273     vma->anon_vma = NULL;  in __anon_vma_del()
274     list_init(&vma->anon_vma_list);  in __anon_vma_del()