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C/C++ Source or Header  |  2005-10-13  |  1KB  |  43 lines
  1. #ifndef _ASM_GENERIC_PERCPU_H_
  2. #define _ASM_GENERIC_PERCPU_H_
  3. #include <linux/compiler.h>
  4.  
  5. #define __GENERIC_PER_CPU
  6. #ifdef CONFIG_SMP
  7.  
  8. extern unsigned long __per_cpu_offset[NR_CPUS];
  9.  
  10. /* Separate out the type, so (int[3], foo) works. */
  11. #define DEFINE_PER_CPU(type, name) \
  12.     __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
  13.  
  14. /* var is in discarded region: offset to particular copy we want */
  15. #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
  16. #define __get_cpu_var(var) per_cpu(var, smp_processor_id())
  17.  
  18. /* A macro to avoid #include hell... */
  19. #define percpu_modcopy(pcpudst, src, size)            \
  20. do {                                \
  21.     unsigned int __i;                    \
  22.     for (__i = 0; __i < NR_CPUS; __i++)            \
  23.         if (cpu_possible(__i))                \
  24.             memcpy((pcpudst)+__per_cpu_offset[__i],    \
  25.                    (src), (size));            \
  26. } while (0)
  27. #else /* ! SMP */
  28.  
  29. #define DEFINE_PER_CPU(type, name) \
  30.     __typeof__(type) per_cpu__##name
  31.  
  32. #define per_cpu(var, cpu)            (*((void)cpu, &per_cpu__##var))
  33. #define __get_cpu_var(var)            per_cpu__##var
  34.  
  35. #endif    /* SMP */
  36.  
  37. #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  38.  
  39. #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  40. #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  41.  
  42. #endif /* _ASM_GENERIC_PERCPU_H_ */
  43.