#ifndef _ASM_GENERIC_PERCPU_H_#define _ASM_GENERIC_PERCPU_H_#include <linux/compiler.h>#include <linux/threads.h> /* * Determine the real variable name from the name visible in the * kernel sources. */#define per_cpu_var(var) per_cpu__##var #ifdef CONFIG_SMP /* * per_cpu_offset() is the offset that has to be added to a * percpu variable to get to the instance for a certain processor. * * Most arches use the __per_cpu_offset array for those offsets but * some arches have their own ways of determining the offset (x86_64, s390). */#ifndef __per_cpu_offsetextern unsigned long __per_cpu_offset[NR_CPUS]; #define per_cpu_offset(x) (__per_cpu_offset[x])#endif /* * Determine the offset for the currently active processor. * An arch may define __my_cpu_offset to provide a more effective * means of obtaining the offset to the per cpu variables of the * current processor. */#ifndef __my_cpu_offset#define __my_cpu_offset per_cpu_offset(raw_smp_processor_id())#endif#ifdef CONFIG_DEBUG_PREEMPT#define my_cpu_offset per_cpu_offset(smp_processor_id())#else#define my_cpu_offset __my_cpu_offset#endif /* * Add a offset to a pointer but keep the pointer as is. * * Only S390 provides its own means of moving the pointer. */#ifndef SHIFT_PERCPU_PTR#define SHIFT_PERCPU_PTR(__p, __offset)	RELOC_HIDE((__p), (__offset))#endif /* * A percpu variable may point to a discarded regions. The following are * established ways to produce a usable pointer from the percpu variable * offset. */#define per_cpu(var, cpu) \	(*SHIFT_PERCPU_PTR(&per_cpu_var(var), per_cpu_offset(cpu)))#define __get_cpu_var(var) \	(*SHIFT_PERCPU_PTR(&per_cpu_var(var), my_cpu_offset))#define __raw_get_cpu_var(var) \	(*SHIFT_PERCPU_PTR(&per_cpu_var(var), __my_cpu_offset))  #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREAextern void setup_per_cpu_areas(void);#endif #else /* ! SMP */ #define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu_var(var)))#define __get_cpu_var(var)			per_cpu_var(var)#define __raw_get_cpu_var(var)			per_cpu_var(var) #endif	/* SMP */ #ifndef PER_CPU_ATTRIBUTES#define PER_CPU_ATTRIBUTES#endif #define DECLARE_PER_CPU(type, name) extern PER_CPU_ATTRIBUTES \					__typeof__(type) per_cpu_var(name) #endif /* _ASM_GENERIC_PERCPU_H_ */