1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * test_free_pages.c: Check that free_pages() doesn't leak memory
4 * Copyright (c) 2020 Oracle
5 * Author: Matthew Wilcox <willy@infradead.org>
6 */
7
8#include <linux/gfp.h>
9#include <linux/mm.h>
10#include <linux/module.h>
11
12static void test_free_pages(gfp_t gfp)
13{
14	unsigned int i;
15
16	for (i = 0; i < 1000 * 1000; i++) {
17		unsigned long addr = __get_free_pages(gfp, 3);
18		struct page *page = virt_to_page(addr);
19
20		/* Simulate page cache getting a speculative reference */
21		get_page(page);
22		free_pages(addr, 3);
23		put_page(page);
24	}
25}
26
27static int m_in(void)
28{
29	test_free_pages(GFP_KERNEL);
30	test_free_pages(GFP_KERNEL | __GFP_COMP);
31
32	return 0;
33}
34
35static void m_ex(void)
36{
37}
38
39module_init(m_in);
40module_exit(m_ex);
41MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
42MODULE_LICENSE("GPL");
43