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16#ifndef _LINUX_RBTREE_H
17#define _LINUX_RBTREE_H
18
19#ifndef __UBOOT__
20#include <linux/kernel.h>
21#endif
22#include <linux/stddef.h>
23
24struct rb_node {
25 unsigned long __rb_parent_color;
26 struct rb_node *rb_right;
27 struct rb_node *rb_left;
28} __attribute__((aligned(sizeof(long))));
29
30
31struct rb_root {
32 struct rb_node *rb_node;
33};
34
35
36#define rb_parent(r) ((struct rb_node *)((r)->__rb_parent_color & ~3))
37
38#define RB_ROOT (struct rb_root) { NULL, }
39#define rb_entry(ptr, type, member) container_of(ptr, type, member)
40
41#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
42
43
44#define RB_EMPTY_NODE(node) \
45 ((node)->__rb_parent_color == (unsigned long)(node))
46#define RB_CLEAR_NODE(node) \
47 ((node)->__rb_parent_color = (unsigned long)(node))
48
49
50extern void rb_insert_color(struct rb_node *, struct rb_root *);
51extern void rb_erase(struct rb_node *, struct rb_root *);
52
53
54
55extern struct rb_node *rb_next(const struct rb_node *);
56extern struct rb_node *rb_prev(const struct rb_node *);
57extern struct rb_node *rb_first(const struct rb_root *);
58extern struct rb_node *rb_last(const struct rb_root *);
59
60
61extern struct rb_node *rb_first_postorder(const struct rb_root *);
62extern struct rb_node *rb_next_postorder(const struct rb_node *);
63
64
65extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
66 struct rb_root *root);
67
68static inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
69 struct rb_node ** rb_link)
70{
71 node->__rb_parent_color = (unsigned long)parent;
72 node->rb_left = node->rb_right = NULL;
73
74 *rb_link = node;
75}
76
77#define rb_entry_safe(ptr, type, member) \
78 ({ typeof(ptr) ____ptr = (ptr); \
79 ____ptr ? rb_entry(____ptr, type, member) : NULL; \
80 })
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90
91#define rbtree_postorder_for_each_entry_safe(pos, n, root, field) \
92 for (pos = rb_entry_safe(rb_first_postorder(root), typeof(*pos), field); \
93 pos && ({ n = rb_entry_safe(rb_next_postorder(&pos->field), \
94 typeof(*pos), field); 1; }); \
95 pos = n)
96
97#endif
98