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In a recent change to the Arm architecture with the end goal of removing highmem we need to convert virt_to_phys() and virt_to_pfn() to static inline functions. This will make them strongly typed. However since virt_to_* is always implemented as macros they have become polymorphic and accept both (void *) and e.g. unsigned long as arguments. Other functions such as virt_to_page() simply wrap virt_to_pfn() and get affected indirectly. To be able to proceed, patch mm to use (void *) as argument to affected functions in all instances. This patch (of 5): A pointer into virtual memory is represented by a (void *) not an u32, so the compiler warns: lib/test_free_pages.c:20:50: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion] Fix this with an explicit cast. Link: https://lkml.kernel.org/r/20220630084124.691207-1-linus.walleij@linaro.org Link: https://lkml.kernel.org/r/20220630084124.691207-2-linus.walleij@linaro.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: Marco Elver <elver@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
47 lines
1,003 B
C
47 lines
1,003 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* test_free_pages.c: Check that free_pages() doesn't leak memory
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* Copyright (c) 2020 Oracle
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* Author: Matthew Wilcox <willy@infradead.org>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/gfp.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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static void test_free_pages(gfp_t gfp)
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{
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unsigned int i;
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for (i = 0; i < 1000 * 1000; i++) {
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unsigned long addr = __get_free_pages(gfp, 3);
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struct page *page = virt_to_page((void *)addr);
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/* Simulate page cache getting a speculative reference */
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get_page(page);
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free_pages(addr, 3);
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put_page(page);
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}
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}
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static int m_in(void)
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{
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pr_info("Testing with GFP_KERNEL\n");
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test_free_pages(GFP_KERNEL);
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pr_info("Testing with GFP_KERNEL | __GFP_COMP\n");
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test_free_pages(GFP_KERNEL | __GFP_COMP);
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pr_info("Test completed\n");
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return 0;
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}
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static void m_ex(void)
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{
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}
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module_init(m_in);
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module_exit(m_ex);
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MODULE_AUTHOR("Matthew Wilcox <willy@infradead.org>");
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MODULE_LICENSE("GPL");
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