提交 8227dce7 编写于 作者: A Alex Nixon 提交者: Ingo Molnar

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

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: NAlex Nixon <alex.nixon@citrix.com>
Acked-by: NJeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 a21f5d88
...@@ -1346,25 +1346,9 @@ static void __ref remove_cpu_from_maps(int cpu) ...@@ -1346,25 +1346,9 @@ static void __ref remove_cpu_from_maps(int cpu)
numa_remove_cpu(cpu); numa_remove_cpu(cpu);
} }
int native_cpu_disable(void) void cpu_disable_common(void)
{ {
int cpu = smp_processor_id(); int cpu = smp_processor_id();
/*
* Perhaps use cpufreq to drop frequency, but that could go
* into generic code.
*
* We won't take down the boot processor on i386 due to some
* interrupts only being able to be serviced by the BSP.
* Especially so if we're not using an IOAPIC -zwane
*/
if (cpu == 0)
return -EBUSY;
if (nmi_watchdog == NMI_LOCAL_APIC)
stop_apic_nmi_watchdog(NULL);
clear_local_APIC();
/* /*
* HACK: * HACK:
* Allow any queued timer interrupts to get serviced * Allow any queued timer interrupts to get serviced
...@@ -1382,6 +1366,28 @@ int native_cpu_disable(void) ...@@ -1382,6 +1366,28 @@ int native_cpu_disable(void)
remove_cpu_from_maps(cpu); remove_cpu_from_maps(cpu);
unlock_vector_lock(); unlock_vector_lock();
fixup_irqs(cpu_online_map); fixup_irqs(cpu_online_map);
}
int native_cpu_disable(void)
{
int cpu = smp_processor_id();
/*
* Perhaps use cpufreq to drop frequency, but that could go
* into generic code.
*
* We won't take down the boot processor on i386 due to some
* interrupts only being able to be serviced by the BSP.
* Especially so if we're not using an IOAPIC -zwane
*/
if (cpu == 0)
return -EBUSY;
if (nmi_watchdog == NMI_LOCAL_APIC)
stop_apic_nmi_watchdog(NULL);
clear_local_APIC();
cpu_disable_common();
return 0; return 0;
} }
......
...@@ -125,6 +125,7 @@ static inline void arch_send_call_function_ipi(cpumask_t mask) ...@@ -125,6 +125,7 @@ static inline void arch_send_call_function_ipi(cpumask_t mask)
smp_ops.send_call_func_ipi(mask); smp_ops.send_call_func_ipi(mask);
} }
void cpu_disable_common(void);
void native_smp_prepare_boot_cpu(void); void native_smp_prepare_boot_cpu(void);
void native_smp_prepare_cpus(unsigned int max_cpus); void native_smp_prepare_cpus(unsigned int max_cpus);
void native_smp_cpus_done(unsigned int max_cpus); void native_smp_cpus_done(unsigned int max_cpus);
......
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