x86_64: use correct PAGE_OFFSET

This fixes a bug when using gdb with vmcore
as explained by Dave Anderson:

The kexec/arch/x86_64/crashdump-x86_64.h file contains a
stale PAGE_OFFSET value.  In 2.6.27 it was changed from
0xffff810000000000UL to 0xffff880000000000UL.  This is
only a problem when using gdb with the vmlinux/vmcore
pair, because gdb relies upon the PT_LOAD segment's p_vaddr
values in the ELF header to be correct.

Cc: Dave Anderson <anderson@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 4 insertions, 0 deletions

diff --git a/kexec/arch_init.c b/kexec/arch_init.c
new file mode 100644
index 0000000..afce72f
--- /dev/null
+++ b/kexec/arch_init.c
@@ -0,0 +1,4 @@
+int arch_init(void)
+{
+	return 0;
+}