home *** CD-ROM | disk | FTP | other *** search
/ PC Welt 2006 November (DVD) / PCWELT_11_2006.ISO / casper / filesystem.squashfs / usr / src / linux-headers-2.6.17-6 / include / asm-generic / percpu.h < prev    next >
Encoding:
C/C++ Source or Header  |  2006-08-11  |  1.3 KB  |  42 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_each_possible_cpu(__i)                \
  23.         memcpy((pcpudst)+__per_cpu_offset[__i],        \
  24.                (src), (size));                \
  25. } while (0)
  26. #else /* ! SMP */
  27.  
  28. #define DEFINE_PER_CPU(type, name) \
  29.     __typeof__(type) per_cpu__##name
  30.  
  31. #define per_cpu(var, cpu)            (*((void)(cpu), &per_cpu__##var))
  32. #define __get_cpu_var(var)            per_cpu__##var
  33.  
  34. #endif    /* SMP */
  35.  
  36. #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  37.  
  38. #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  39. #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  40.  
  41. #endif /* _ASM_GENERIC_PERCPU_H_ */
  42.