1 files changed, 29 insertions, 172 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index f03914b..3ed5c7a 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -20,6 +20,9 @@
  * cpu_number_map in other architectures.
  */
 
+#define KMSG_COMPONENT "cpu"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/mm.h>
@@ -71,159 +74,6 @@ static DEFINE_PER_CPU(struct cpu, cpu_devices);
 
 static void smp_ext_bitcall(int, ec_bit_sig);
 
-/*
- * Structure and data for __smp_call_function_map(). This is designed to
- * minimise static memory requirements. It also looks cleaner.
- */
-static DEFINE_SPINLOCK(call_lock);
-
-struct call_data_struct {
-	void (*func) (void *info);
-	void *info;
-	cpumask_t started;
-	cpumask_t finished;
-	int wait;
-};
-
-static struct call_data_struct *call_data;
-
-/*
- * 'Call function' interrupt callback
- */
-static void do_call_function(void)
-{
-	void (*func) (void *info) = call_data->func;
-	void *info = call_data->info;
-	int wait = call_data->wait;
-
-	cpu_set(smp_processor_id(), call_data->started);
-	(*func)(info);
-	if (wait)
-		cpu_set(smp_processor_id(), call_data->finished);;
-}
-
-static void __smp_call_function_map(void (*func) (void *info), void *info,
-				    int wait, cpumask_t map)
-{
-	struct call_data_struct data;
-	int cpu, local = 0;
-
-	/*
-	 * Can deadlock when interrupts are disabled or if in wrong context.
-	 */
-	WARN_ON(irqs_disabled() || in_irq());
-
-	/*
-	 * Check for local function call. We have to have the same call order
-	 * as in on_each_cpu() because of machine_restart_smp().
-	 */
-	if (cpu_isset(smp_processor_id(), map)) {
-		local = 1;
-		cpu_clear(smp_processor_id(), map);
-	}
-
-	cpus_and(map, map, cpu_online_map);
-	if (cpus_empty(map))
-		goto out;
-
-	data.func = func;
-	data.info = info;
-	data.started = CPU_MASK_NONE;
-	data.wait = wait;
-	if (wait)
-		data.finished = CPU_MASK_NONE;
-
-	call_data = &data;
-
-	for_each_cpu_mask(cpu, map)
-		smp_ext_bitcall(cpu, ec_call_function);
-
-	/* Wait for response */
-	while (!cpus_equal(map, data.started))
-		cpu_relax();
-	if (wait)
-		while (!cpus_equal(map, data.finished))
-			cpu_relax();
-out:
-	if (local) {
-		local_irq_disable();
-		func(info);
-		local_irq_enable();
-	}
-}
-
-/*
- * smp_call_function:
- * @func: the function to run; this must be fast and non-blocking
- * @info: an arbitrary pointer to pass to the function
- * @wait: if true, wait (atomically) until function has completed on other CPUs
- *
- * Run a function on all other CPUs.
- *
- * You must not call this function with disabled interrupts, from a
- * hardware interrupt handler or from a bottom half.
- */
-int smp_call_function(void (*func) (void *info), void *info, int wait)
-{
-	cpumask_t map;
-
-	spin_lock(&call_lock);
-	map = cpu_online_map;
-	cpu_clear(smp_processor_id(), map);
-	__smp_call_function_map(func, info, wait, map);
-	spin_unlock(&call_lock);
-	return 0;
-}
-EXPORT_SYMBOL(smp_call_function);
-
-/*
- * smp_call_function_single:
- * @cpu: the CPU where func should run
- * @func: the function to run; this must be fast and non-blocking
- * @info: an arbitrary pointer to pass to the function
- * @wait: if true, wait (atomically) until function has completed on other CPUs
- *
- * Run a function on one processor.
- *
- * You must not call this function with disabled interrupts, from a
- * hardware interrupt handler or from a bottom half.
- */
-int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
-			     int wait)
-{
-	spin_lock(&call_lock);
-	__smp_call_function_map(func, info, wait, cpumask_of_cpu(cpu));
-	spin_unlock(&call_lock);
-	return 0;
-}
-EXPORT_SYMBOL(smp_call_function_single);
-
-/**
- * smp_call_function_mask(): Run a function on a set of other CPUs.
- * @mask: The set of cpus to run on.  Must not include the current cpu.
- * @func: The function to run. This must be fast and non-blocking.
- * @info: An arbitrary pointer to pass to the function.
- * @wait: If true, wait (atomically) until function has completed on other CPUs.
- *
- * Returns 0 on success, else a negative status code.
- *
- * If @wait is true, then returns once @func has returned; otherwise
- * it returns just before the target cpu calls @func.
- *
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-int smp_call_function_mask(cpumask_t mask, void (*func)(void *), void *info,
-			   int wait)
-{
-	spin_lock(&call_lock);
-	cpu_clear(smp_processor_id(), mask);
-	__smp_call_function_map(func, info, wait, mask);
-	spin_unlock(&call_lock);
-	return 0;
-}
-EXPORT_SYMBOL(smp_call_function_mask);
-
 void smp_send_stop(void)
 {
 	int cpu, rc;
@@ -265,7 +115,10 @@ static void do_ext_call_interrupt(__u16 code)
 	bits = xchg(&S390_lowcore.ext_call_fast, 0);
 
 	if (test_bit(ec_call_function, &bits))
-		do_call_function();
+		generic_smp_call_function_interrupt();
+
+	if (test_bit(ec_call_function_single, &bits))
+		generic_smp_call_function_single_interrupt();
 }
 
 /*
@@ -282,6 +135,19 @@ static void smp_ext_bitcall(int cpu, ec_bit_sig sig)
 		udelay(10);
 }
 
+void arch_send_call_function_ipi(cpumask_t mask)
+{
+	int cpu;
+
+	for_each_cpu_mask(cpu, mask)
+		smp_ext_bitcall(cpu, ec_call_function);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+	smp_ext_bitcall(cpu, ec_call_function_single);
+}
+
 #ifndef CONFIG_64BIT
 /*
  * this function sends a 'purge tlb' signal to another CPU.
@@ -382,8 +248,8 @@ static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
 	if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 		return;
 	if (cpu >= NR_CPUS) {
-		printk(KERN_WARNING "Registers for cpu %i not saved since dump "
-		       "kernel was compiled with NR_CPUS=%i\n", cpu, NR_CPUS);
+		pr_warning("CPU %i exceeds the maximum %i and is excluded from "
+			   "the dump\n", cpu, NR_CPUS - 1);
 		return;
 	}
 	zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL);
@@ -556,7 +422,7 @@ static void __init smp_detect_cpus(void)
 	}
 out:
 	kfree(info);
-	printk(KERN_INFO "CPUs: %d configured, %d standby\n", c_cpus, s_cpus);
+	pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus);
 	get_online_cpus();
 	__smp_rescan_cpus();
 	put_online_cpus();
@@ -572,19 +438,17 @@ int __cpuinit start_secondary(void *cpuvoid)
 	preempt_disable();
 	/* Enable TOD clock interrupts on the secondary cpu. */
 	init_cpu_timer();
-#ifdef CONFIG_VIRT_TIMER
 	/* Enable cpu timer interrupts on the secondary cpu. */
 	init_cpu_vtimer();
-#endif
 	/* Enable pfault pseudo page faults on this cpu. */
 	pfault_init();
 
 	/* call cpu notifiers */
 	notify_cpu_starting(smp_processor_id());
 	/* Mark this cpu as online */
-	spin_lock(&call_lock);
+	ipi_call_lock();
 	cpu_set(smp_processor_id(), cpu_online_map);
-	spin_unlock(&call_lock);
+	ipi_call_unlock();
 	/* Switch on interrupts */
 	local_irq_enable();
 	/* Print info about this processor */
@@ -633,18 +497,15 @@ static int __cpuinit smp_alloc_lowcore(int cpu)
 
 		save_area = get_zeroed_page(GFP_KERNEL);
 		if (!save_area)
-			goto out_save_area;
+			goto out;
 		lowcore->extended_save_area_addr = (u32) save_area;
 	}
 #endif
 	lowcore_ptr[cpu] = lowcore;
 	return 0;
 
-#ifndef CONFIG_64BIT
-out_save_area:
-	free_page(panic_stack);
-#endif
 out:
+	free_page(panic_stack);
 	free_pages(async_stack, ASYNC_ORDER);
 	free_pages((unsigned long) lowcore, lc_order);
 	return -ENOMEM;
@@ -684,12 +545,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
 
 	ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]),
 				   cpu, sigp_set_prefix);
-	if (ccode) {
-		printk("sigp_set_prefix failed for cpu %d "
-		       "with condition code %d\n",
-		       (int) cpu, (int) ccode);
+	if (ccode)
 		return -EIO;
-	}
 
 	idle = current_set[cpu];
 	cpu_lowcore = lowcore_ptr[cpu];
@@ -772,7 +629,7 @@ void __cpu_die(unsigned int cpu)
 	while (!smp_cpu_not_running(cpu))
 		cpu_relax();
 	smp_free_lowcore(cpu);
-	printk(KERN_INFO "Processor %d spun down\n", cpu);
+	pr_info("Processor %d stopped\n", cpu);
 }
 
 void cpu_die(void)