mirror of https://gitee.com/openkylin/linux.git
150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "list_sort_test: " fmt
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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 serial;
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};
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/* Array, containing pointers to all elements in the test list */
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static struct debug_el **elts __initdata;
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static int __init check(struct debug_el *ela, struct debug_el *elb)
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{
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if (ela->serial >= TEST_LIST_LEN) {
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pr_err("error: incorrect serial %d\n", ela->serial);
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return -EINVAL;
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}
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if (elb->serial >= TEST_LIST_LEN) {
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pr_err("error: incorrect serial %d\n", elb->serial);
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return -EINVAL;
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}
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if (elts[ela->serial] != ela || elts[elb->serial] != elb) {
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pr_err("error: phantom element\n");
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return -EINVAL;
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}
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if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) {
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pr_err("error: bad poison: %#x/%#x\n",
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ela->poison1, ela->poison2);
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return -EINVAL;
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}
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if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) {
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pr_err("error: bad poison: %#x/%#x\n",
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elb->poison1, elb->poison2);
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return -EINVAL;
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}
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return 0;
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}
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static int __init cmp(void *priv, const struct list_head *a,
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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(ela, elb);
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return ela->value - elb->value;
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}
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static int __init list_sort_test(void)
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{
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int i, count = 1, err = -ENOMEM;
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struct debug_el *el;
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struct list_head *cur;
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LIST_HEAD(head);
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pr_debug("start testing list_sort()\n");
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elts = kcalloc(TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL);
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if (!elts)
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return err;
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for (i = 0; i < TEST_LIST_LEN; i++) {
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el = kmalloc(sizeof(*el), GFP_KERNEL);
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if (!el)
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goto exit;
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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(NULL, &head, cmp);
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err = -EINVAL;
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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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if (cur->next->prev != cur) {
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pr_err("error: list is corrupted\n");
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goto exit;
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}
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cmp_result = cmp(NULL, cur, cur->next);
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if (cmp_result > 0) {
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pr_err("error: list is not sorted\n");
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goto exit;
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}
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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 && el->serial >= el1->serial) {
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pr_err("error: order of equivalent elements not "
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"preserved\n");
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goto exit;
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}
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if (check(el, el1)) {
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pr_err("error: element check failed\n");
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goto exit;
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}
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count++;
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}
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if (head.prev != cur) {
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pr_err("error: list is corrupted\n");
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goto exit;
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}
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if (count != TEST_LIST_LEN) {
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pr_err("error: bad list length %d", count);
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goto exit;
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}
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err = 0;
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exit:
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for (i = 0; i < TEST_LIST_LEN; i++)
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kfree(elts[i]);
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kfree(elts);
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return err;
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}
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module_init(list_sort_test);
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MODULE_LICENSE("GPL");
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