Commit 3e459990 authored by Catalin Marinas's avatar Catalin Marinas Committed by Russell King
Browse files

[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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent ae30ceac

arch/arm/kernel/smp.c

+27 −2
Original line number Diff line number Diff line
@@ -454,6 +454,27 @@ int smp_call_function(void (*func)(void *info), void *info, int retry, 
}

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 @@ void show_local_irqs(struct seq_file *p) 
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 @@ void smp_send_timer(void) 
	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;

include/asm-arm/smp.h

+10 −0
Original line number Diff line number Diff line
@@ -60,6 +60,11 @@ extern void smp_cross_call(cpumask_t callmap); 
 */

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 void platform_cpu_die(unsigned int cpu); 
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.