// SPDX-License-Identifier: GPL-2.0+/* * test_free_pages.c: Check that free_pages() doesn't leak memory * Copyright (c) 2020 Oracle * Author: Matthew Wilcox <willy@infradead.org> */ #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt #include <linux/gfp.h>#include <linux/mm.h>#include <linux/module.h> static void test_free_pages(gfp_t gfp){	unsigned int i; 	for (i = 0; i < 1000 * 1000; i++) {		unsigned long addr = __get_free_pages(gfp, 3);		struct page *page = virt_to_page((void *)addr); 		/* Simulate page cache getting a speculative reference */		get_page(page);		free_pages(addr, 3);		put_page(page);	}} static int m_in(void){	pr_info("Testing with GFP_KERNEL\n");	test_free_pages(GFP_KERNEL);	pr_info("Testing with GFP_KERNEL | __GFP_COMP\n");	test_free_pages(GFP_KERNEL | __GFP_COMP);	pr_info("Test completed\n"); 	return 0;} static void m_ex(void){} module_init(m_in);module_exit(m_ex);MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");MODULE_DESCRIPTION("Check that free_pages() doesn't leak memory");MODULE_LICENSE("GPL");