sh: remove arch-specific localtimer and use generic one

The code being removed was copied from arm, where the corresponding
code was removed in 2013. The only functional change should be that
the rating of the dummy local timer changes from 400 to 100.
Signed-off-by: Rich Felker <dalias@libc.org>

arch/sh/Kconfig

 config SUPERH
 	def_bool y
+	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select HAVE_PATA_PLATFORM
 	select CLKDEV_LOOKUP

arch/sh/kernel/Makefile

@@ -46,6 +46,5 @@ obj-$(CONFIG_DWARF_UNWINDER)	+= dwarf.o
 obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o perf_callchain.o
 
 obj-$(CONFIG_HAVE_HW_BREAKPOINT)		+= hw_breakpoint.o
-obj-$(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)	+= localtimer.o
 
 ccflags-y := -Werror

arch/sh/kernel/localtimer.c

-/*
- * Dummy local timer
- *
- * Copyright (C) 2008  Paul Mundt
- *
- * cloned from:
- *
- *  linux/arch/arm/mach-realview/localtimer.c
- *
- *  Copyright (C) 2002 ARM Ltd.
- *  All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/smp.h>
-#include <linux/jiffies.h>
-#include <linux/percpu.h>
-#include <linux/clockchips.h>
-#include <linux/hardirq.h>
-#include <linux/irq.h>
-
-static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
-
-/*
- * Used on SMP for either the local timer or SMP_MSG_TIMER
- */
-void local_timer_interrupt(void)
-{
-	struct clock_event_device *clk = this_cpu_ptr(&local_clockevent);
-
-	irq_enter();
-	clk->event_handler(clk);
-	irq_exit();
-}
-
-void local_timer_setup(unsigned int cpu)
-{
-	struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
-
-	clk->name		= "dummy_timer";
-	clk->features		= CLOCK_EVT_FEAT_ONESHOT |
-				  CLOCK_EVT_FEAT_PERIODIC |
-				  CLOCK_EVT_FEAT_DUMMY;
-	clk->rating		= 400;
-	clk->mult		= 1;
-	clk->broadcast		= smp_timer_broadcast;
-	clk->cpumask		= cpumask_of(cpu);
-
-	clockevents_register_device(clk);
-}
-
-void local_timer_stop(unsigned int cpu)
-{
-}

arch/sh/kernel/smp.c

@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <linux/atomic.h>
+#include <linux/clockchips.h>
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 #include <asm/smp.h>
@@ -140,11 +141,6 @@ int __cpu_disable(void)
 	 */
 	migrate_irqs();
 
-	/*
-	 * Stop the local timer for this CPU.
-	 */
-	local_timer_stop(cpu);
-
 	/*
 	 * Flush user cache and TLB mappings, and then remove this CPU
 	 * from the vm mask set of all processes.
@@ -198,8 +194,6 @@ asmlinkage void start_secondary(void)
 
 	local_irq_enable();
 
-	/* Enable local timers */
-	local_timer_setup(cpu);
 	calibrate_delay();
 
 	smp_store_cpu_info(cpu);
@@ -289,7 +283,8 @@ void arch_send_call_function_single_ipi(int cpu)
 	mp_ops->send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
 }
 
-void smp_timer_broadcast(const struct cpumask *mask)
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
+void tick_broadcast(const struct cpumask *mask)
 {
 	int cpu;
 
@@ -300,9 +295,10 @@ void smp_timer_broadcast(const struct cpumask *mask)
 static void ipi_timer(void)
 {
 	irq_enter();
-	local_timer_interrupt();
+	tick_receive_broadcast();
 	irq_exit();
 }
+#endif
 
 void smp_message_recv(unsigned int msg)
 {
@@ -316,9 +312,11 @@ void smp_message_recv(unsigned int msg)
 	case SMP_MSG_FUNCTION_SINGLE:
 		generic_smp_call_function_single_interrupt();
 		break;
+#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 	case SMP_MSG_TIMER:
 		ipi_timer();
 		break;
+#endif
 	default:
 		printk(KERN_WARNING "SMP %d: %s(): unknown IPI %d\n",
 		       smp_processor_id(), __func__, msg);