1. 根目录:
2. arch
3. x86
4. include
5. asm
6. idle.h

#ifndef _ASM_X86_IDLE_H
#define _ASM_X86_IDLE_H

#ifdef CONFIG_X86_64
void enter_idle(void);
void exit_idle(void);
#else /* !CONFIG_X86_64 */
static inline void enter_idle(void) { }
static inline void exit_idle(void) { }
#endif /* CONFIG_X86_64 */

void c1e_remove_cpu(int cpu);

#endif /* _ASM_X86_IDLE_H */