LXR linux-bk/include/asm-generic/percpu.h

   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
   8extern 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)                      \
  20do {                                                            \
  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