// SPDX-License-Identifier: GPL-2.0-only/* * arch/arm/kernel/crash_dump.c * * Copyright (C) 2010 Nokia Corporation. * Author: Mika Westerberg * * This code is taken from arch/x86/kernel/crash_dump_64.c *   Created by: Hariprasad Nellitheertha (hari@in.ibm.com) *   Copyright (C) IBM Corporation, 2004. All rights reserved */ #include <linux/errno.h>#include <linux/crash_dump.h>#include <linux/uaccess.h>#include <linux/io.h>#include <linux/uio.h> ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,			 size_t csize, unsigned long offset){	void *vaddr; 	if (!csize)		return 0; 	vaddr = ioremap(__pfn_to_phys(pfn), PAGE_SIZE);	if (!vaddr)		return -ENOMEM; 	csize = copy_to_iter(vaddr + offset, csize, iter); 	iounmap(vaddr);	return csize;}