[PATCH] kdump: read previous kernel's memory

[firefly-linux-kernel-4.4.55.git] / kernel / crash_dump.c

diff --git a/kernel/crash_dump.c b/kernel/crash_dump.c
deleted file mode 100644 (file)
index fccb27d..0000000
--- a/kernel/crash_dump.c
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- *     kernel/crash_dump.c - Memory preserving reboot related code.
- *
- *     Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
- *     Copyright (C) IBM Corporation, 2004. All rights reserved
- */
-
-#include <linux/smp_lock.h>
-#include <linux/errno.h>
-#include <linux/proc_fs.h>
-#include <linux/bootmem.h>
-#include <linux/highmem.h>
-#include <linux/crash_dump.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/kexec.h>
-
-/* Stores the physical address of elf header of crash image. */
-unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
-
-#ifndef HAVE_ARCH_COPY_OLDMEM_PAGE
-/**
- * copy_oldmem_page - copy one page from "oldmem"
- * @pfn: page frame number to be copied
- * @buf: target memory address for the copy; this can be in kernel address
- *     space or user address space (see @userbuf)
- * @csize: number of bytes to copy
- * @offset: offset in bytes into the page (based on pfn) to begin the copy
- * @userbuf: if set, @buf is in user address space, use copy_to_user(),
- *     otherwise @buf is in kernel address space, use memcpy().
- *
- * Copy a page from "oldmem". For this page, there is no pte mapped
- * in the current kernel. We stitch up a pte, similar to kmap_atomic.
- */
-ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
-                               size_t csize, unsigned long offset, int userbuf)
-{
-       void *page, *vaddr;
-
-       if (!csize)
-               return 0;
-
-       page = kmalloc(PAGE_SIZE, GFP_KERNEL);
-       if (!page)
-               return -ENOMEM;
-
-       vaddr = kmap_atomic_pfn(pfn, KM_PTE0);
-       copy_page(page, vaddr);
-       kunmap_atomic(vaddr, KM_PTE0);
-
-       if (userbuf) {
-               if (copy_to_user(buf, (page + offset), csize)) {
-                       kfree(page);
-                       return -EFAULT;
-               }
-       } else {
-               memcpy(buf, (page + offset), csize);
-       }
-
-       kfree(page);
-       return csize;
-}
-#endif