__stable_node

Name:Like for get_ksm_page, this function can free the *_stable_node and* *_stable_node_dup if the returned tree_page is NULL

Proto:static struct page *__stable_node_chain(struct stable_node **_stable_node_dup, struct stable_node **_stable_node, struct rb_root *root, bool prune_stale_stable_nodes)

Type:struct page

Parameter:

Type	Parameter	Name
struct stable_node **	_stable_node_dup
struct stable_node **	_stable_node
struct rb_root *	root
bool	prune_stale_stable_nodes

1505

stable_node = _stable_node

1506

If Not is_stable_node_chain(stable_node) Then

1507

If is_page_sharing_candidate(stable_node) Then

1508

_stable_node_dup = stable_node

1509

Return get_ksm_page: checks if the page indicated by the stable node* is still its ksm page, despite having held no reference to it.* In which case we can trust the content of the page, and it* returns the gotten page; but if the page has now been zapped,

1515

* _stable_node_dup = NULL

1516

Return NULL

1518

Return stable_node_dup(_stable_node_dup, _stable_node, root, prune_stale_stable_nodes)

**Caller**
Name	Describe
chain_prune
chain

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Function report