From: https://lkml.org/lkml/2016/12/31/13

The build robot reports:

   .tmp_kallsyms1.o: In function `kallsyms_relative_base':
>> (.rodata+0x8a18): undefined reference to `_text'

This is when using 'make alldefconfig'. Adding this _text symbol to mark
the start of the kernel as in other architecture fixes this.

Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

diff -Nur linux-4.9.orig/arch/openrisc/kernel/vmlinux.lds.S linux-4.9/arch/openrisc/kernel/vmlinux.lds.S
--- linux-4.9.orig/arch/openrisc/kernel/vmlinux.lds.S	2016-12-11 20:17:54.000000000 +0100
+++ linux-4.9/arch/openrisc/kernel/vmlinux.lds.S	2017-01-01 12:13:43.039107518 +0100
@@ -38,6 +38,8 @@
         /* Read-only sections, merged into text segment: */
         . = LOAD_BASE ;
 
+	_text = .;
+
 	/* _s_kernel_ro must be page aligned */
 	. = ALIGN(PAGE_SIZE);
 	_s_kernel_ro = .;