kdump: make elfcorehdr_addr independent of CONFIG_PROC_VMCORE

[safe/jmp/linux-2.6] / arch / x86 / kernel / crash_dump_64.c

diff --git a/arch/x86/kernel/crash_dump_64.c b/arch/x86/kernel/crash_dump_64.c
index 942deac..045b36c 100644 (file)
--- a/arch/x86/kernel/crash_dump_64.c
+++ b/arch/x86/kernel/crash_dump_64.c
@@ -1,5 +1,5 @@
 /*
- *     kernel/crash_dump.c - Memory preserving reboot related code.
+ *     Memory preserving reboot related code.
  *
  *     Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
  *     Copyright (C) IBM Corporation, 2004. All rights reserved
@@ -7,9 +7,11 @@
 
 #include <linux/errno.h>
 #include <linux/crash_dump.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
 
-#include <asm/uaccess.h>
-#include <asm/io.h>
+/* Stores the physical address of elf header of crash image. */
+unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX;
 
 /**
  * copy_oldmem_page - copy one page from "oldmem"
@@ -25,7 +27,7 @@
  * 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)
+               size_t csize, unsigned long offset, int userbuf)
 {
        void  *vaddr;
 
@@ -33,14 +35,16 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
                return 0;
 
        vaddr = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
+       if (!vaddr)
+               return -ENOMEM;
 
        if (userbuf) {
-               if (copy_to_user(buf, (vaddr + offset), csize)) {
+               if (copy_to_user(buf, vaddr + offset, csize)) {
                        iounmap(vaddr);
                        return -EFAULT;
                }
        } else
-       memcpy(buf, (vaddr + offset), csize);
+               memcpy(buf, vaddr + offset, csize);
 
        iounmap(vaddr);
        return csize;