diff options
Diffstat (limited to 'arch/arm64/kernel/crash_dump.c')
| -rw-r--r-- | arch/arm64/kernel/crash_dump.c | 36 |
1 files changed, 7 insertions, 29 deletions
diff --git a/arch/arm64/kernel/crash_dump.c b/arch/arm64/kernel/crash_dump.c index 6b5037ed15b2..670e4ce81822 100644 --- a/arch/arm64/kernel/crash_dump.c +++ b/arch/arm64/kernel/crash_dump.c @@ -1,36 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Routines for doing kexec-based kdump * * Copyright (C) 2017 Linaro Limited * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/crash_dump.h> #include <linux/errno.h> #include <linux/io.h> -#include <linux/memblock.h> -#include <linux/uaccess.h> +#include <linux/uio.h> #include <asm/memory.h> -/** - * copy_oldmem_page() - copy one page from old kernel memory - * @pfn: page frame number to be copied - * @buf: buffer where the copied page is placed - * @csize: number of bytes to copy - * @offset: offset in bytes into the page - * @userbuf: if set, @buf is in a user address space - * - * This function copies one page from old kernel memory into buffer pointed by - * @buf. If @buf is in userspace, set @userbuf to %1. Returns number of bytes - * copied or negative error in case of failure. - */ -ssize_t copy_oldmem_page(unsigned long pfn, char *buf, - size_t csize, unsigned long offset, - int userbuf) +ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, + size_t csize, unsigned long offset) { void *vaddr; @@ -41,14 +24,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, if (!vaddr) return -ENOMEM; - if (userbuf) { - if (copy_to_user((char __user *)buf, vaddr + offset, csize)) { - memunmap(vaddr); - return -EFAULT; - } - } else { - memcpy(buf, vaddr + offset, csize); - } + csize = copy_to_iter(vaddr + offset, csize, iter); memunmap(vaddr); @@ -67,5 +43,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos) { memcpy(buf, phys_to_virt((phys_addr_t)*ppos), count); + *ppos += count; + return count; } |