1 // SPDX-License-Identifier: GPL-2.0-only
2 #define pr_fmt(fmt) "min_heap_test: " fmt
3
4 /*
5 * Test cases for the min max heap.
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
less_than(const void * lhs,const void * rhs)14 static __init bool less_than(const void *lhs, const void *rhs)
15 {
16 return *(int *)lhs < *(int *)rhs;
17 }
18
greater_than(const void * lhs,const void * rhs)19 static __init bool greater_than(const void *lhs, const void *rhs)
20 {
21 return *(int *)lhs > *(int *)rhs;
22 }
23
swap_ints(void * lhs,void * rhs)24 static __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
pop_verify_heap(bool min_heap,struct min_heap * heap,const struct min_heap_callbacks * funcs)32 static __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
test_heapify_all(bool min_heap)62 static __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 /* Test with known set of values. */
79 min_heapify_all(&heap, &funcs);
80 err = pop_verify_heap(min_heap, &heap, &funcs);
81
82
83 /* Test with randomly generated values. */
84 heap.nr = ARRAY_SIZE(values);
85 for (i = 0; i < heap.nr; i++)
86 values[i] = get_random_u32();
87
88 min_heapify_all(&heap, &funcs);
89 err += pop_verify_heap(min_heap, &heap, &funcs);
90
91 return err;
92 }
93
test_heap_push(bool min_heap)94 static __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 /* Test with known set of values copied from data. */
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 /* Test with randomly generated values. */
118 while (heap.nr < heap.size) {
119 temp = get_random_u32();
120 min_heap_push(&heap, &temp, &funcs);
121 }
122 err += pop_verify_heap(min_heap, &heap, &funcs);
123
124 return err;
125 }
126
test_heap_pop_push(bool min_heap)127 static __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 /* Fill values with data to pop and replace. */
145 temp = min_heap ? 0x80000000 : 0x7FFFFFFF;
146 for (i = 0; i < ARRAY_SIZE(data); i++)
147 min_heap_push(&heap, &temp, &funcs);
148
149 /* Test with known set of values copied from data. */
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 /* Test with randomly generated values. */
160 for (i = 0; i < ARRAY_SIZE(data); i++) {
161 temp = get_random_u32();
162 min_heap_pop_push(&heap, &temp, &funcs);
163 }
164 err += pop_verify_heap(min_heap, &heap, &funcs);
165
166 return err;
167 }
168
test_min_heap_init(void)169 static 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 }
186 module_init(test_min_heap_init);
187
test_min_heap_exit(void)188 static void __exit test_min_heap_exit(void)
189 {
190 /* do nothing */
191 }
192 module_exit(test_min_heap_exit);
193
194 MODULE_LICENSE("GPL");
195