Remove GENERIC_HARDIRQ config option

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/kernel/Makefile b/kernel/Makefile
index 35ef118..1ce4755 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -26,6 +26,7 @@
 obj-y += power/
 obj-y += printk/
 obj-y += cpu/
+obj-y += irq/
 
 obj-$(CONFIG_CHECKPOINT_RESTORE) += kcmp.o
 obj-$(CONFIG_FREEZER) += freezer.o
@@ -79,7 +80,6 @@
 obj-$(CONFIG_KGDB) += debug/
 obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
 obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
-obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
 obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_TREE_RCU) += rcutree.o
diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index d1a758b..4a1fef0 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -1,15 +1,4 @@
-# Select this to activate the generic irq options below
-config HAVE_GENERIC_HARDIRQS
-	bool
-
-if HAVE_GENERIC_HARDIRQS
 menu "IRQ subsystem"
-#
-# Interrupt subsystem related configuration options
-#
-config GENERIC_HARDIRQS
-       def_bool y
-
 # Options selectable by the architecture code
 
 # Make sparse irq Kconfig switch below available
@@ -84,4 +73,3 @@
 	  If you don't know what to do here, say N.
 
 endmenu
-endif
diff --git a/kernel/softirq.c b/kernel/softirq.c
index be3d351..53cc09c 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -876,7 +876,6 @@
 	return 0;
 }
 
-#ifdef CONFIG_GENERIC_HARDIRQS
 int __init __weak arch_probe_nr_irqs(void)
 {
 	return NR_IRQS_LEGACY;
@@ -886,4 +885,3 @@
 {
 	return 0;
 }
-#endif