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// 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");
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