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![Ian Rogers](/assets/img/avatar_default.png)
Supports push, pop and converting an array into a heap. If the sense of the compare function is inverted then it can provide a max-heap. Based-on-work-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20200214075133.181299-3-irogers@google.com
194 lines
4.3 KiB
C
194 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "min_heap_test: " fmt
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/*
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* Test cases for the min max heap.
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*/
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#include <linux/log2.h>
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#include <linux/min_heap.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/random.h>
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static __init bool less_than(const void *lhs, const void *rhs)
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{
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return *(int *)lhs < *(int *)rhs;
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}
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static __init bool greater_than(const void *lhs, const void *rhs)
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{
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return *(int *)lhs > *(int *)rhs;
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}
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static __init void swap_ints(void *lhs, void *rhs)
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{
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int temp = *(int *)lhs;
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*(int *)lhs = *(int *)rhs;
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*(int *)rhs = temp;
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}
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static __init int pop_verify_heap(bool min_heap,
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struct min_heap *heap,
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const struct min_heap_callbacks *funcs)
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{
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int *values = heap->data;
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int err = 0;
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int last;
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last = values[0];
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min_heap_pop(heap, funcs);
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while (heap->nr > 0) {
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if (min_heap) {
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if (last > values[0]) {
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pr_err("error: expected %d <= %d\n", last,
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values[0]);
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err++;
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}
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} else {
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if (last < values[0]) {
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pr_err("error: expected %d >= %d\n", last,
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values[0]);
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err++;
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}
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}
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last = values[0];
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min_heap_pop(heap, funcs);
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}
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return err;
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}
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static __init int test_heapify_all(bool min_heap)
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{
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int values[] = { 3, 1, 2, 4, 0x8000000, 0x7FFFFFF, 0,
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-3, -1, -2, -4, 0x8000000, 0x7FFFFFF };
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struct min_heap heap = {
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.data = values,
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.nr = ARRAY_SIZE(values),
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.size = ARRAY_SIZE(values),
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};
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struct min_heap_callbacks funcs = {
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.elem_size = sizeof(int),
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.less = min_heap ? less_than : greater_than,
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.swp = swap_ints,
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};
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int i, err;
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/* Test with known set of values. */
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min_heapify_all(&heap, &funcs);
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err = pop_verify_heap(min_heap, &heap, &funcs);
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/* Test with randomly generated values. */
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heap.nr = ARRAY_SIZE(values);
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for (i = 0; i < heap.nr; i++)
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values[i] = get_random_int();
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min_heapify_all(&heap, &funcs);
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err += pop_verify_heap(min_heap, &heap, &funcs);
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return err;
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}
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static __init int test_heap_push(bool min_heap)
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{
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const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
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-3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
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int values[ARRAY_SIZE(data)];
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struct min_heap heap = {
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.data = values,
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.nr = 0,
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.size = ARRAY_SIZE(values),
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};
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struct min_heap_callbacks funcs = {
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.elem_size = sizeof(int),
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.less = min_heap ? less_than : greater_than,
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.swp = swap_ints,
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};
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int i, temp, err;
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/* Test with known set of values copied from data. */
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for (i = 0; i < ARRAY_SIZE(data); i++)
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min_heap_push(&heap, &data[i], &funcs);
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err = pop_verify_heap(min_heap, &heap, &funcs);
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/* Test with randomly generated values. */
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while (heap.nr < heap.size) {
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temp = get_random_int();
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min_heap_push(&heap, &temp, &funcs);
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}
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err += pop_verify_heap(min_heap, &heap, &funcs);
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return err;
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}
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static __init int test_heap_pop_push(bool min_heap)
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{
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const int data[] = { 3, 1, 2, 4, 0x80000000, 0x7FFFFFFF, 0,
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-3, -1, -2, -4, 0x80000000, 0x7FFFFFFF };
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int values[ARRAY_SIZE(data)];
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struct min_heap heap = {
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.data = values,
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.nr = 0,
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.size = ARRAY_SIZE(values),
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};
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struct min_heap_callbacks funcs = {
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.elem_size = sizeof(int),
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.less = min_heap ? less_than : greater_than,
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.swp = swap_ints,
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};
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int i, temp, err;
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/* Fill values with data to pop and replace. */
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temp = min_heap ? 0x80000000 : 0x7FFFFFFF;
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for (i = 0; i < ARRAY_SIZE(data); i++)
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min_heap_push(&heap, &temp, &funcs);
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/* Test with known set of values copied from data. */
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for (i = 0; i < ARRAY_SIZE(data); i++)
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min_heap_pop_push(&heap, &data[i], &funcs);
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err = pop_verify_heap(min_heap, &heap, &funcs);
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heap.nr = 0;
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for (i = 0; i < ARRAY_SIZE(data); i++)
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min_heap_push(&heap, &temp, &funcs);
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/* Test with randomly generated values. */
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for (i = 0; i < ARRAY_SIZE(data); i++) {
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temp = get_random_int();
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min_heap_pop_push(&heap, &temp, &funcs);
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}
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err += pop_verify_heap(min_heap, &heap, &funcs);
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return err;
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}
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static int __init test_min_heap_init(void)
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{
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int err = 0;
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err += test_heapify_all(true);
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err += test_heapify_all(false);
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err += test_heap_push(true);
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err += test_heap_push(false);
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err += test_heap_pop_push(true);
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err += test_heap_pop_push(false);
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if (err) {
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pr_err("test failed with %d errors\n", err);
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return -EINVAL;
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}
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pr_info("test passed\n");
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return 0;
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}
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module_init(test_min_heap_init);
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static void __exit test_min_heap_exit(void)
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{
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/* do nothing */
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}
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module_exit(test_min_heap_exit);
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MODULE_LICENSE("GPL");
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