b3c56f8f20
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>
48 lines
1003 B
C
48 lines
1003 B
C
// 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_LICENSE("GPL");
|