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// SPDX-License-Identifier: GPL-2.0-only
#define pr_fmt(fmt) "list_sort_test: " fmt
#include <linux/kernel.h>
#include <linux/list_sort.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/random.h>
/*
* The pattern of set bits in the list length determines which cases
* are hit in list_sort().
*/
#define TEST_LIST_LEN (512+128+2) /* not including head */
#define TEST_POISON1 0xDEADBEEF
#define TEST_POISON2 0xA324354C
struct debug_el {
unsigned int poison1;
struct list_head list;
unsigned int poison2;
int value;
unsigned serial;
};
/* Array, containing pointers to all elements in the test list */
static struct debug_el **elts __initdata;
static int __init check(struct debug_el *ela, struct debug_el *elb)
{
if (ela->serial >= TEST_LIST_LEN) {
pr_err("error: incorrect serial %d\n", ela->serial);
return -EINVAL;
}
if (elb->serial >= TEST_LIST_LEN) {
pr_err("error: incorrect serial %d\n", elb->serial);
return -EINVAL;
}
if (elts[ela->serial] != ela || elts[elb->serial] != elb) {
pr_err("error: phantom element\n");
return -EINVAL;
}
if (ela->poison1 != TEST_POISON1 || ela->poison2 != TEST_POISON2) {
pr_err("error: bad poison: %#x/%#x\n",
ela->poison1, ela->poison2);
return -EINVAL;
}
if (elb->poison1 != TEST_POISON1 || elb->poison2 != TEST_POISON2) {
pr_err("error: bad poison: %#x/%#x\n",
elb->poison1, elb->poison2);
return -EINVAL;
}
return 0;
}
static int __init cmp(void *priv, struct list_head *a, struct list_head *b)
{
struct debug_el *ela, *elb;
ela = container_of(a, struct debug_el, list);
elb = container_of(b, struct debug_el, list);
check(ela, elb);
return ela->value - elb->value;
}
static int __init list_sort_test(void)
{
int i, count = 1, err = -ENOMEM;
struct debug_el *el;
struct list_head *cur;
LIST_HEAD(head);
pr_debug("start testing list_sort()\n");
elts = kcalloc(TEST_LIST_LEN, sizeof(*elts), GFP_KERNEL);
if (!elts)
return err;
for (i = 0; i < TEST_LIST_LEN; i++) {
el = kmalloc(sizeof(*el), GFP_KERNEL);
if (!el)
goto exit;
/* force some equivalencies */
el->value = prandom_u32() % (TEST_LIST_LEN / 3);
el->serial = i;
el->poison1 = TEST_POISON1;
el->poison2 = TEST_POISON2;
elts[i] = el;
list_add_tail(&el->list, &head);
}
list_sort(NULL, &head, cmp);
err = -EINVAL;
for (cur = head.next; cur->next != &head; cur = cur->next) {
struct debug_el *el1;
int cmp_result;
if (cur->next->prev != cur) {
pr_err("error: list is corrupted\n");
goto exit;
}
cmp_result = cmp(NULL, cur, cur->next);
if (cmp_result > 0) {
pr_err("error: list is not sorted\n");
goto exit;
}
el = container_of(cur, struct debug_el, list);
el1 = container_of(cur->next, struct debug_el, list);
if (cmp_result == 0 && el->serial >= el1->serial) {
pr_err("error: order of equivalent elements not "
"preserved\n");
goto exit;
}
if (check(el, el1)) {
pr_err("error: element check failed\n");
goto exit;
}
count++;
}
if (head.prev != cur) {
pr_err("error: list is corrupted\n");
goto exit;
}
if (count != TEST_LIST_LEN) {
pr_err("error: bad list length %d", count);
goto exit;
}
err = 0;
exit:
for (i = 0; i < TEST_LIST_LEN; i++)
kfree(elts[i]);
kfree(elts);
return err;
}
module_init(list_sort_test);
MODULE_LICENSE("GPL");
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