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| 3 | * test_free_pages.c: Check that free_pages() doesn't leak memory
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| 4 | * Copyright (c) 2020 Oracle
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| 5 | * Author: Matthew Wilcox <[email protected]>
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| 6 |
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| 7 |
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| 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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| 9 |
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| 10 | #include <linux/gfp.h>
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| 11 | #include <linux/mm.h>
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| 12 | #include <linux/module.h>
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| 13 |
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| 14 | static void test_free_pages(gfp_t gfp)
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| 15 | {
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| 16 | unsigned int i;
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| 17 |
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| 18 | for (i = 0; i < 1000 * 1000; i++) {
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| 19 | unsigned long addr = __get_free_pages(gfp, 3);
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| 20 | struct page *page = virt_to_page((void *)addr);
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| 21 |
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| 22 |
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| 23 | get_page(page);
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| 24 | free_pages(addr, 3);
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| 25 | put_page(page);
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| 26 | }
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| 27 | }
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| 28 |
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| 29 | static int m_in(void)
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| 30 | {
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| 31 | pr_info("Testing with GFP_KERNEL\n");
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| 32 | test_free_pages(GFP_KERNEL);
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| 33 | pr_info("Testing with GFP_KERNEL | __GFP_COMP\n");
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| 34 | test_free_pages(GFP_KERNEL | __GFP_COMP);
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| 35 | pr_info("Test completed\n");
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| 36 |
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| 37 | return 0;
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| 38 | }
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| 39 |
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| 40 | static void m_ex(void)
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| 41 | {
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| 42 | }
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| 43 |
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| 44 | module_init(m_in);
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| 45 | module_exit(m_ex);
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| 46 | MODULE_AUTHOR("Matthew Wilcox <[email protected]>");
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| 47 | MODULE_DESCRIPTION("Check that free_pages() doesn't leak memory");
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| 48 | MODULE_LICENSE("GPL");
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