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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_UNION_FIND_H
3#define __LINUX_UNION_FIND_H
4/**
5 * union_find.h - union-find data structure implementation
6 *
7 * This header provides functions and structures to implement the union-find
8 * data structure. The union-find data structure is used to manage disjoint
9 * sets and supports efficient union and find operations.
10 *
11 * See Documentation/core-api/union_find.rst for documentation and samples.
12 */
13
14struct uf_node {
15 struct uf_node *parent;
16 unsigned int rank;
17};
18
19/* This macro is used for static initialization of a union-find node. */
20#define UF_INIT_NODE(node) {.parent = &node, .rank = 0}
21
22/**
23 * uf_node_init - Initialize a union-find node
24 * @node: pointer to the union-find node to be initialized
25 *
26 * This function sets the parent of the node to itself and
27 * initializes its rank to 0.
28 */
29static inline void uf_node_init(struct uf_node *node)
30{
31 node->parent = node;
32 node->rank = 0;
33}
34
35/* find the root of a node */
36struct uf_node *uf_find(struct uf_node *node);
37
38/* Merge two intersecting nodes */
39void uf_union(struct uf_node *node1, struct uf_node *node2);
40
41#endif /* __LINUX_UNION_FIND_H */