openrisc: Use generic init_task

Same code. Use the generic version. The special Makefile treatment is
pointless anyway as init_task.o contains only data which is handled by
the linker script. So no point on being treated like head text.

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Jonas Bonn <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]

arch/openrisc/Kconfig

···
 	select GENERIC_IOMAP
 	select GENERIC_CPU_DEVICES
 	select GENERIC_ATOMIC64
+	select HAVE_GENERIC_INIT_TASK
 
 config MMU
 	def_bool y

arch/openrisc/Makefile

···
 	KBUILD_CFLAGS += $(call cc-option,-msoft-div)
 endif
 
-head-y 		:= arch/openrisc/kernel/head.o arch/openrisc/kernel/init_task.o
+head-y 		:= arch/openrisc/kernel/head.o
 
 core-y		+= arch/openrisc/lib/ \
 		   arch/openrisc/kernel/ \

arch/openrisc/kernel/Makefile

···
 # Makefile for the linux kernel.
 #
 
-extra-y	:= head.o vmlinux.lds init_task.o
+extra-y	:= head.o vmlinux.lds
 
 obj-y	:= setup.o idle.o or32_ksyms.o process.o dma.o \
 	   traps.o time.o irq.o entry.o ptrace.o signal.o sys_or32.o \

arch/openrisc/kernel/init_task.c

···
-/*
- * OpenRISC init_task.c
- *
- * Linux architectural port borrowing liberally from similar works of
- * others.  All original copyrights apply as per the original source
- * declaration.
- *
- * Modifications for the OpenRISC architecture:
- * Copyright (C) 2003 Matjaz Breskvar <[e-mail]>
- * Copyright (C) 2010-2011 Jonas Bonn <[e-mail]>
- *
- *      This program is free software; you can redistribute it and/or
- *      modify it under the terms of the GNU General Public License
- *      as published by the Free Software Foundation; either version
- *      2 of the License, or (at your option) any later version.
- */
-
-#include <linux/init_task.h>
-#include <linux/mqueue.h>
-#include <linux/export.h>
-
-static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
-static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
-
-/*
- * Initial thread structure.
- *
- * We need to make sure that this is THREAD_SIZE aligned due to the
- * way process stacks are handled. This is done by having a special
- * "init_task" linker map entry..
- */
-union thread_union init_thread_union __init_task_data = {
-	INIT_THREAD_INFO(init_task)
-};
-
-/*
- * Initial task structure.
- *
- * All other task structs will be allocated on slabs in fork.c
- */
-struct task_struct init_task = INIT_TASK(init_task);
-EXPORT_SYMBOL(init_task);