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x86: separate generic cpu disabling code from APIC writes in cpu_disable

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It allows paravirt implementations of cpu_disable to share the
cpu_disable_common code, without having to take on board APIC
writes, which may not be appropriate.

Signed-off-by: Alex Nixon <alex.nixon@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alex Nixon 2008-08-22 11:52:14 +01:00 committed by Ingo Molnar
parent a21f5d88c1
commit 8227dce7dc
2 changed files with 24 additions and 17 deletions
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40
arch/x86/kernel/smpboot.c
View file

@ -1346,6 +1346,28 @@ static void __ref remove_cpu_from_maps(int cpu)
numa_remove_cpu(cpu);
}
void cpu_disable_common(void)
{
int cpu = smp_processor_id();
/*
* HACK:
* Allow any queued timer interrupts to get serviced
* This is only a temporary solution until we cleanup
* fixup_irqs as we do for IA64.
*/
local_irq_enable();
mdelay(1);
local_irq_disable();
remove_siblinginfo(cpu);
/* It's now safe to remove this processor from the online map */
lock_vector_lock();
remove_cpu_from_maps(cpu);
unlock_vector_lock();
fixup_irqs(cpu_online_map);
}
int native_cpu_disable(void)
{
int cpu = smp_processor_id();
@ -1365,23 +1387,7 @@ int native_cpu_disable(void)
stop_apic_nmi_watchdog(NULL);
clear_local_APIC();
/*
* HACK:
* Allow any queued timer interrupts to get serviced
* This is only a temporary solution until we cleanup
* fixup_irqs as we do for IA64.
*/
local_irq_enable();
mdelay(1);
local_irq_disable();
remove_siblinginfo(cpu);
/* It's now safe to remove this processor from the online map */
lock_vector_lock();
remove_cpu_from_maps(cpu);
unlock_vector_lock();
fixup_irqs(cpu_online_map);
cpu_disable_common();
return 0;
}

1
include/asm-x86/smp.h
View file

@ -125,6 +125,7 @@ static inline void arch_send_call_function_ipi(cpumask_t mask)
smp_ops.send_call_func_ipi(mask);
}
void cpu_disable_common(void);
void native_smp_prepare_boot_cpu(void);
void native_smp_prepare_cpus(unsigned int max_cpus);
void native_smp_cpus_done(unsigned int max_cpus);