1
2#define pr_fmt(fmt) "min_heap_test: " fmt
3
4
5
6
7
8#include <linux/log2.h>
9#include <linux/min_heap.h>
10#include <linux/module.h>
11#include <linux/printk.h>
12#include <linux/random.h>
13
14static __init bool less_than(const void *lhs, const void *rhs)
15{
16 return *(int *)lhs < *(int *)rhs;
17}
18
19static __init bool greater_than(const void *lhs, const void *rhs)
20{
21 return *(int *)lhs > *(int *)rhs;
22}
23
24static __init void swap_ints(void *lhs, void *rhs)
25{
26 int temp = *(int *)lhs;
27
28 *(int *)lhs = *(int *)rhs;
29 *(int *)rhs = temp;
30}
31
32static __init int pop_verify_heap(bool min_heap,
33 struct min_heap *heap,
34 const struct min_heap_callbacks *funcs)
35{
36 int *values = heap->data;
37 int err = 0;
38 int last;
39
40 last = values[0];
41 min_heap_pop(heap, funcs);
42 while (heap->nr > 0) {
43 if (min_heap) {
44 if (last > values[0]) {
45 pr_err("error: expected %d <= %d\n", last,
46 values[0]);
47 err++;
48 }
49 } else {
50 if (last < values[0]) {
51 pr_err("error: expected %d >= %d\n", last,
52 values[0]);
53 err++;
54 }
55 }
56 last = values[0];
57 min_heap_pop(heap, funcs);
58 }
59 return err;
60}
61
62static __init int test_heapify_all(bool min_heap)
63{
64 int values[] = { 3, 1, 2, 4, 0x8000000, 0x7FFFFFF, 0,
65 -3, -1, -2, -4, 0x8000000, 0x7FFFFFF };
66 struct min_heap heap = {
67 .data = values,
68 .nr = ARRAY_SIZE(values),
69 .size = ARRAY_SIZE(values),
70 };
71 struct min_heap_callbacks funcs = {
72 .elem_size = sizeof(int),
73 .less = min_heap ? less_than : greater_than,
74 .swp = swap_ints,
75 };
76 int i, err;
77
78
79 min_heapify_all(&heap, &funcs);
80 err = pop_verify_heap(min_heap, &heap, &funcs);
81
82
83
84 heap.nr = ARRAY_SIZE(values);
85 for (i = 0; i < heap.nr; i++)
86 values[i] = get_random_int();
87
88 min_heapify_all(&heap, &funcs);
89 err += pop_verify_heap(min_heap, &heap, &funcs);
90
91 return err;
92}
93
94static __init int test_heap_push(bool min_heap)
95{
96 const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
97 -3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
98 int values[ARRAY_SIZE(data)];
99 struct min_heap heap = {
100 .data = values,
101 .nr = 0,
102 .size = ARRAY_SIZE(values),
103 };
104 struct min_heap_callbacks funcs = {
105 .elem_size = sizeof(int),
106 .less = min_heap ? less_than : greater_than,
107 .swp = swap_ints,
108 };
109 int i, temp, err;
110
111
112 for (i = 0; i < ARRAY_SIZE(data); i++)
113 min_heap_push(&heap, &data[i], &funcs);
114
115 err = pop_verify_heap(min_heap, &heap, &funcs);
116
117
118 while (heap.nr < heap.size) {
119 temp = get_random_int();
120 min_heap_push(&heap, &temp, &funcs);
121 }
122 err += pop_verify_heap(min_heap, &heap, &funcs);
123
124 return err;
125}
126
127static __init int test_heap_pop_push(bool min_heap)
128{
129 const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
130 -3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
131 int values[ARRAY_SIZE(data)];
132 struct min_heap heap = {
133 .data = values,
134 .nr = 0,
135 .size = ARRAY_SIZE(values),
136 };
137 struct min_heap_callbacks funcs = {
138 .elem_size = sizeof(int),
139 .less = min_heap ? less_than : greater_than,
140 .swp = swap_ints,
141 };
142 int i, temp, err;
143
144
145 temp = min_heap ? 0x80000000 : 0x7FFFFFFF;
146 for (i = 0; i < ARRAY_SIZE(data); i++)
147 min_heap_push(&heap, &temp, &funcs);
148
149
150 for (i = 0; i < ARRAY_SIZE(data); i++)
151 min_heap_pop_push(&heap, &data[i], &funcs);
152
153 err = pop_verify_heap(min_heap, &heap, &funcs);
154
155 heap.nr = 0;
156 for (i = 0; i < ARRAY_SIZE(data); i++)
157 min_heap_push(&heap, &temp, &funcs);
158
159
160 for (i = 0; i < ARRAY_SIZE(data); i++) {
161 temp = get_random_int();
162 min_heap_pop_push(&heap, &temp, &funcs);
163 }
164 err += pop_verify_heap(min_heap, &heap, &funcs);
165
166 return err;
167}
168
169static int __init test_min_heap_init(void)
170{
171 int err = 0;
172
173 err += test_heapify_all(true);
174 err += test_heapify_all(false);
175 err += test_heap_push(true);
176 err += test_heap_push(false);
177 err += test_heap_pop_push(true);
178 err += test_heap_pop_push(false);
179 if (err) {
180 pr_err("test failed with %d errors\n", err);
181 return -EINVAL;
182 }
183 pr_info("test passed\n");
184 return 0;
185}
186module_init(test_min_heap_init);
187
188static void __exit test_min_heap_exit(void)
189{
190
191}
192module_exit(test_min_heap_exit);
193
194MODULE_LICENSE("GPL");
195
