[ARM] 4813/1: Add SMP helper functions for clockevents support
This patch adds the smp_call_function_single and smp_timer_broadcast
functions and modifies ipi_timer to call the platform-specific function
local_timer_interrupt.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index eafbb2b..aef6f9a 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -454,6 +454,27 @@
}
EXPORT_SYMBOL_GPL(smp_call_function);
+int smp_call_function_single(int cpu, void (*func)(void *info), void *info,
+ int retry, int wait)
+{
+ /* prevent preemption and reschedule on another processor */
+ int current_cpu = get_cpu();
+ int ret = 0;
+
+ if (cpu == current_cpu) {
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
+ } else
+ ret = smp_call_function_on_cpu(func, info, retry, wait,
+ cpumask_of_cpu(cpu));
+
+ put_cpu();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(smp_call_function_single);
+
void show_ipi_list(struct seq_file *p)
{
unsigned int cpu;
@@ -481,8 +502,7 @@
static void ipi_timer(void)
{
irq_enter();
- profile_tick(CPU_PROFILING);
- update_process_times(user_mode(get_irq_regs()));
+ local_timer_interrupt();
irq_exit();
}
@@ -621,6 +641,11 @@
send_ipi_message(mask, IPI_TIMER);
}
+void smp_timer_broadcast(cpumask_t mask)
+{
+ send_ipi_message(mask, IPI_TIMER);
+}
+
void smp_send_stop(void)
{
cpumask_t mask = cpu_online_map;
diff --git a/include/asm-arm/smp.h b/include/asm-arm/smp.h
index f67acce..1f7c51a 100644
--- a/include/asm-arm/smp.h
+++ b/include/asm-arm/smp.h
@@ -61,6 +61,11 @@
extern void smp_send_timer(void);
/*
+ * Broadcast a clock event to other CPUs.
+ */
+extern void smp_timer_broadcast(cpumask_t mask);
+
+/*
* Boot a secondary CPU, and assign it the specified idle task.
* This also gives us the initial stack to use for this CPU.
*/
@@ -96,6 +101,11 @@
extern int platform_cpu_kill(unsigned int cpu);
extern void platform_cpu_enable(unsigned int cpu);
+/*
+ * Local timer interrupt handling function (can be IPI'ed).
+ */
+extern void local_timer_interrupt(void);
+
#ifdef CONFIG_LOCAL_TIMERS
/*
* Setup a local timer interrupt for a CPU.