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kernel add
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#ifndef _ASM_X86_CPU_H
#define _ASM_X86_CPU_H
#include <linux/device.h>
#include <linux/cpu.h>
#include <linux/topology.h>
#include <linux/nodemask.h>
#include <linux/percpu.h>
#ifdef CONFIG_SMP
extern void prefill_possible_map(void);
#else /* CONFIG_SMP */
static inline void prefill_possible_map(void) {}
#define cpu_physical_id(cpu) boot_cpu_physical_apicid
#define safe_smp_processor_id() 0
#define stack_smp_processor_id() 0
#endif /* CONFIG_SMP */
struct x86_cpu {
struct cpu cpu;
};
#ifdef CONFIG_HOTPLUG_CPU
extern int arch_register_cpu(int num);
extern void arch_unregister_cpu(int);
extern void start_cpu0(void);
#ifdef CONFIG_DEBUG_HOTPLUG_CPU0
extern int _debug_hotplug_cpu(int cpu, int action);
#endif
#endif
int mwait_usable(const struct cpuinfo_x86 *);
#endif /* _ASM_X86_CPU_H */
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