#ifndef _ASM_GENERIC_PERCPU_H_
  #define _ASM_GENERIC_PERCPU_H_
  #include <linux/compiler.h>

  #include <linux/threads.h>

  
  #define __GENERIC_PER_CPU
  #ifdef CONFIG_SMP
  
  extern unsigned long __per_cpu_offset[NR_CPUS];

  #define per_cpu_offset(x) (__per_cpu_offset[x])

  /* Separate out the type, so (int[3], foo) works. */
  #define DEFINE_PER_CPU(type, name) \
      __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name

  #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)		\
      __attribute__((__section__(".data.percpu.shared_aligned"))) \
      __typeof__(type) per_cpu__##name				\
      ____cacheline_aligned_in_smp

  /* var is in discarded region: offset to particular copy we want */

  #define per_cpu(var, cpu) (*({				\

  	extern int simple_identifier_##var(void);	\

  	RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))

  #define __get_cpu_var(var) per_cpu(var, smp_processor_id())

  #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())

  
  /* A macro to avoid #include hell... */
  #define percpu_modcopy(pcpudst, src, size)			\
  do {								\
  	unsigned int __i;					\

  	for_each_possible_cpu(__i)				\

  		memcpy((pcpudst)+__per_cpu_offset[__i],		\
  		       (src), (size));				\

  } while (0)
  #else /* ! SMP */
  
  #define DEFINE_PER_CPU(type, name) \
      __typeof__(type) per_cpu__##name

  #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)	\
      DEFINE_PER_CPU(type, name)

  #define per_cpu(var, cpu)			(*((void)(cpu), &per_cpu__##var))

  #define __get_cpu_var(var)			per_cpu__##var

  #define __raw_get_cpu_var(var)			per_cpu__##var

  
  #endif	/* SMP */
  
  #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  
  #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  
  #endif /* _ASM_GENERIC_PERCPU_H_ */