static void get_index(const struct prio_tree_root *root,
const struct prio_tree_node *node,
unsigned long *radix, unsigned long *heap)
{
if (root->raw) {
struct vm_area_struct *vma = prio_tree_entry(
node, struct vm_area_struct, shared.prio_tree_node);
*radix = RADIX_INDEX(vma);
*heap = HEAP_INDEX(vma);
}
else {
/*
* Add a new vma known to map the same set of pages as the old vma:
* useful for fork's dup_mmap as well as vma_prio_tree_insert below.
* Note that it just happens to work correctly on i_mmap_nonlinear too.
*/
void vma_prio_tree_add(struct vm_area_struct *vma, struct vm_area_struct *old)
{
/* Leave these BUG_ONs till prio_tree patch stabilizes */
BUG_ON(RADIX_INDEX(vma) != RADIX_INDEX(old));
BUG_ON(HEAP_INDEX(vma) != HEAP_INDEX(old));
vma->shared.vm_set.head = NULL;
vma->shared.vm_set.parent = NULL;
if (!old->shared.vm_set.parent)
list_add(&vma->shared.vm_set.list,
&old->shared.vm_set.list);
else if (old->shared.vm_set.head)
list_add_tail(&vma->shared.vm_set.list,
&old->shared.vm_set.head->shared.vm_set.list);
else {
INIT_LIST_HEAD(&vma->shared.vm_set.list);
vma->shared.vm_set.head = old;
old->shared.vm_set.head = vma;
}
}
