123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <kunit/test.h>
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#include <linux/kernel.h>
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#include <linux/list_sort.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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/*
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* The pattern of set bits in the list length determines which cases
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* are hit in list_sort().
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*/
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#define TEST_LIST_LEN (512+128+2) /* not including head */
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#define TEST_POISON1 0xDEADBEEF
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#define TEST_POISON2 0xA324354C
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struct debug_el {
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unsigned int poison1;
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struct list_head list;
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unsigned int poison2;
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int value;
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unsigned int serial;
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};
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static void check(struct kunit *test, struct debug_el *ela, struct debug_el *elb)
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{
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struct debug_el **elts = test->priv;
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KUNIT_EXPECT_LT_MSG(test, ela->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial");
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KUNIT_EXPECT_LT_MSG(test, elb->serial, (unsigned int)TEST_LIST_LEN, "incorrect serial");
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KUNIT_EXPECT_PTR_EQ_MSG(test, elts[ela->serial], ela, "phantom element");
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KUNIT_EXPECT_PTR_EQ_MSG(test, elts[elb->serial], elb, "phantom element");
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KUNIT_EXPECT_EQ_MSG(test, ela->poison1, TEST_POISON1, "bad poison");
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KUNIT_EXPECT_EQ_MSG(test, ela->poison2, TEST_POISON2, "bad poison");
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KUNIT_EXPECT_EQ_MSG(test, elb->poison1, TEST_POISON1, "bad poison");
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KUNIT_EXPECT_EQ_MSG(test, elb->poison2, TEST_POISON2, "bad poison");
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}
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/* `priv` is the test pointer so check() can fail the test if the list is invalid. */
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static int cmp(void *priv, const struct list_head *a, const struct list_head *b)
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{
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struct debug_el *ela, *elb;
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ela = container_of(a, struct debug_el, list);
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elb = container_of(b, struct debug_el, list);
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check(priv, ela, elb);
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return ela->value - elb->value;
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}
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static void list_sort_test(struct kunit *test)
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{
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int i, count = 1;
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struct debug_el *el, **elts;
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struct list_head *cur;
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LIST_HEAD(head);
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elts = kunit_kcalloc(test, TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, elts);
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test->priv = elts;
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for (i = 0; i < TEST_LIST_LEN; i++) {
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el = kunit_kmalloc(test, sizeof(*el), GFP_KERNEL);
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KUNIT_ASSERT_NOT_ERR_OR_NULL(test, el);
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/* force some equivalencies */
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el->value = prandom_u32() % (TEST_LIST_LEN / 3);
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el->serial = i;
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el->poison1 = TEST_POISON1;
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el->poison2 = TEST_POISON2;
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elts[i] = el;
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list_add_tail(&el->list, &head);
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}
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list_sort(test, &head, cmp);
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for (cur = head.next; cur->next != &head; cur = cur->next) {
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struct debug_el *el1;
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int cmp_result;
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KUNIT_ASSERT_PTR_EQ_MSG(test, cur->next->prev, cur,
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"list is corrupted");
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cmp_result = cmp(test, cur, cur->next);
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KUNIT_ASSERT_LE_MSG(test, cmp_result, 0, "list is not sorted");
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el = container_of(cur, struct debug_el, list);
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el1 = container_of(cur->next, struct debug_el, list);
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if (cmp_result == 0) {
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KUNIT_ASSERT_LE_MSG(test, el->serial, el1->serial,
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"order of equivalent elements not preserved");
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}
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check(test, el, el1);
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count++;
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}
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KUNIT_EXPECT_PTR_EQ_MSG(test, head.prev, cur, "list is corrupted");
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KUNIT_EXPECT_EQ_MSG(test, count, TEST_LIST_LEN,
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"list length changed after sorting!");
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}
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static struct kunit_case list_sort_cases[] = {
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KUNIT_CASE(list_sort_test),
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{}
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};
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static struct kunit_suite list_sort_suite = {
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.name = "list_sort",
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.test_cases = list_sort_cases,
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};
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kunit_test_suites(&list_sort_suite);
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MODULE_LICENSE("GPL");
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