1e320d301SMatthew Wilcox (Oracle) // SPDX-License-Identifier: GPL-2.0+ 2e320d301SMatthew Wilcox (Oracle) /* 3e320d301SMatthew Wilcox (Oracle) * test_free_pages.c: Check that free_pages() doesn't leak memory 4e320d301SMatthew Wilcox (Oracle) * Copyright (c) 2020 Oracle 5e320d301SMatthew Wilcox (Oracle) * Author: Matthew Wilcox <willy@infradead.org> 6e320d301SMatthew Wilcox (Oracle) */ 7e320d301SMatthew Wilcox (Oracle) 80ae446e4SGeert Uytterhoeven #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 90ae446e4SGeert Uytterhoeven 10e320d301SMatthew Wilcox (Oracle) #include <linux/gfp.h> 11e320d301SMatthew Wilcox (Oracle) #include <linux/mm.h> 12e320d301SMatthew Wilcox (Oracle) #include <linux/module.h> 13e320d301SMatthew Wilcox (Oracle) test_free_pages(gfp_t gfp)14e320d301SMatthew Wilcox (Oracle)static void test_free_pages(gfp_t gfp) 15e320d301SMatthew Wilcox (Oracle) { 16e320d301SMatthew Wilcox (Oracle) unsigned int i; 17e320d301SMatthew Wilcox (Oracle) 18e320d301SMatthew Wilcox (Oracle) for (i = 0; i < 1000 * 1000; i++) { 19e320d301SMatthew Wilcox (Oracle) unsigned long addr = __get_free_pages(gfp, 3); 20b3c56f8fSLinus Walleij struct page *page = virt_to_page((void *)addr); 21e320d301SMatthew Wilcox (Oracle) 22e320d301SMatthew Wilcox (Oracle) /* Simulate page cache getting a speculative reference */ 23e320d301SMatthew Wilcox (Oracle) get_page(page); 24e320d301SMatthew Wilcox (Oracle) free_pages(addr, 3); 25e320d301SMatthew Wilcox (Oracle) put_page(page); 26e320d301SMatthew Wilcox (Oracle) } 27e320d301SMatthew Wilcox (Oracle) } 28e320d301SMatthew Wilcox (Oracle) m_in(void)29e320d301SMatthew Wilcox (Oracle)static int m_in(void) 30e320d301SMatthew Wilcox (Oracle) { 310ae446e4SGeert Uytterhoeven pr_info("Testing with GFP_KERNEL\n"); 32e320d301SMatthew Wilcox (Oracle) test_free_pages(GFP_KERNEL); 330ae446e4SGeert Uytterhoeven pr_info("Testing with GFP_KERNEL | __GFP_COMP\n"); 34e320d301SMatthew Wilcox (Oracle) test_free_pages(GFP_KERNEL | __GFP_COMP); 350ae446e4SGeert Uytterhoeven pr_info("Test completed\n"); 36e320d301SMatthew Wilcox (Oracle) 37e320d301SMatthew Wilcox (Oracle) return 0; 38e320d301SMatthew Wilcox (Oracle) } 39e320d301SMatthew Wilcox (Oracle) m_ex(void)40e320d301SMatthew Wilcox (Oracle)static void m_ex(void) 41e320d301SMatthew Wilcox (Oracle) { 42e320d301SMatthew Wilcox (Oracle) } 43e320d301SMatthew Wilcox (Oracle) 44e320d301SMatthew Wilcox (Oracle) module_init(m_in); 45e320d301SMatthew Wilcox (Oracle) module_exit(m_ex); 46e320d301SMatthew Wilcox (Oracle) MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>"); 47*30347491SJeff Johnson MODULE_DESCRIPTION("Check that free_pages() doesn't leak memory"); 48e320d301SMatthew Wilcox (Oracle) MODULE_LICENSE("GPL"); 49