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29#ifndef _LINUX_RBTREE_H
30#define _LINUX_RBTREE_H
31
32#include <linux/kernel.h>
33#include <linux/stddef.h>
34
35struct rb_node {
36 unsigned long __rb_parent_color;
37 struct rb_node *rb_right;
38 struct rb_node *rb_left;
39} __attribute__((aligned(sizeof(long))));
40
41
42struct rb_root {
43 struct rb_node *rb_node;
44};
45
46
47#define rb_parent(r) ((struct rb_node *)((r)->__rb_parent_color & ~3))
48
49#define RB_ROOT (struct rb_root) { NULL, }
50#define rb_entry(ptr, type, member) container_of(ptr, type, member)
51
52#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
53
54
55#define RB_EMPTY_NODE(node) \
56 ((node)->__rb_parent_color == (unsigned long)(node))
57#define RB_CLEAR_NODE(node) \
58 ((node)->__rb_parent_color = (unsigned long)(node))
59
60
61extern void rb_insert_color(struct rb_node *, struct rb_root *);
62extern void rb_erase(struct rb_node *, struct rb_root *);
63
64
65
66extern struct rb_node *rb_next(const struct rb_node *);
67extern struct rb_node *rb_prev(const struct rb_node *);
68extern struct rb_node *rb_first(const struct rb_root *);
69extern struct rb_node *rb_last(const struct rb_root *);
70
71
72extern struct rb_node *rb_first_postorder(const struct rb_root *);
73extern struct rb_node *rb_next_postorder(const struct rb_node *);
74
75
76extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
77 struct rb_root *root);
78
79static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
80 struct rb_node ** rb_link)
81{
82 node->__rb_parent_color = (unsigned long)parent;
83 node->rb_left = node->rb_right = NULL;
84
85 *rb_link = node;
86}
87
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94
95
96
97#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \
98 for (pos = rb_entry(rb_first_postorder(root), typeof(*pos), field),\
99 n = rb_entry(rb_next_postorder(&pos->field), \
100 typeof(*pos), field); \
101 &pos->field; \
102 pos = n, \
103 n = rb_entry(rb_next_postorder(&pos->field), \
104 typeof(*pos), field))
105
106#endif
107