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Commit a21f5d88 authored by Alex Nixon's avatar Alex Nixon Committed by Ingo Molnar
Browse files

x86: unify x86_32 and x86_64 play_dead into one function 



Add the new play_dead into smpboot.c, as it fits more cleanly in there
alongside other CONFIG_HOTPLUG functions.

Separate out the common code into its own function.

Signed-off-by: default avatarAlex Nixon <alex.nixon@citrix.com>
Acked-by: default avatarJeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 37900258

arch/x86/kernel/process_32.c

+0 −32
Original line number Diff line number Diff line
@@ -72,38 +72,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk) 
	return ((unsigned long *)tsk->thread.sp)[3];

}



#ifdef CONFIG_HOTPLUG_CPU

#include <asm/nmi.h>



/* We don't actually take CPU down, just spin without interrupts. */

void native_play_dead(void)

{

	int cpu = raw_smp_processor_id();



	idle_task_exit();



	reset_lazy_tlbstate();



	irq_ctx_exit(cpu);



	mb();

	/* Ack it */

	__get_cpu_var(cpu_state) = CPU_DEAD;



	/*

	 * With physical CPU hotplug, we should halt the cpu

	 */

	local_irq_disable();

	/* mask all interrupts, flush any and all caches, and halt */

	wbinvd_halt();

}

#else

void native_play_dead(void)

{

	BUG();

}

#endif /* CONFIG_HOTPLUG_CPU */



/*

 * The idle thread. There's no useful work to be

 * done, so just try to conserve power and have a

arch/x86/kernel/process_64.c

+0 −23
Original line number Diff line number Diff line
@@ -85,29 +85,6 @@ void exit_idle(void) 
	__exit_idle();

}



#ifdef CONFIG_HOTPLUG_CPU

DECLARE_PER_CPU(int, cpu_state);



#include <asm/nmi.h>

/* We halt the CPU with physical CPU hotplug */

void native_play_dead(void)

{

	idle_task_exit();

	mb();

	/* Ack it */

	__get_cpu_var(cpu_state) = CPU_DEAD;



	local_irq_disable();

	/* mask all interrupts, flush any and all caches, and halt */

	wbinvd_halt();

}

#else

void native_play_dead(void)

{

	BUG();

}

#endif /* CONFIG_HOTPLUG_CPU */



/*

 * The idle thread. There's no useful work to be

 * done, so just try to conserve power and have a

arch/x86/kernel/smpboot.c

+29 −0
Original line number Diff line number Diff line
@@ -1402,6 +1402,29 @@ void native_cpu_die(unsigned int cpu) 
	}

	printk(KERN_ERR "CPU %u didn't die...\n", cpu);

}



void play_dead_common(void)

{

	idle_task_exit();

	reset_lazy_tlbstate();

	irq_ctx_exit(raw_smp_processor_id());



	mb();

	/* Ack it */

	__get_cpu_var(cpu_state) = CPU_DEAD;



	/*

	 * With physical CPU hotplug, we should halt the cpu

	 */

	local_irq_disable();

}



void native_play_dead(void)

{

	play_dead_common();

	wbinvd_halt();

}



#else /* ... !CONFIG_HOTPLUG_CPU */

int native_cpu_disable(void)

{
@@ -1413,4 +1436,10 @@ void native_cpu_die(unsigned int cpu) 
	/* We said "no" in __cpu_disable */

	BUG();

}



void native_play_dead(void)

{

	BUG();

}



#endif

include/asm-x86/smp.h

+1 −0
Original line number Diff line number Diff line
@@ -132,6 +132,7 @@ int native_cpu_up(unsigned int cpunum); 
int native_cpu_disable(void);

void native_cpu_die(unsigned int cpu);

void native_play_dead(void);

void play_dead_common(void);



void native_send_call_func_ipi(cpumask_t mask);

void native_send_call_func_single_ipi(int cpu);