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Linux/include/asm-x86_64/percpu.h

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  1 #ifndef _ASM_X8664_PERCPU_H_
  2 #define _ASM_X8664_PERCPU_H_
  3 #include <linux/compiler.h>
  4 
  5 /* Same as asm-generic/percpu.h, except that we store the per cpu offset
  6    in the PDA. Longer term the PDA and every per cpu variable
  7    should be just put into a single section and referenced directly
  8    from %gs */
  9 
 10 #ifdef CONFIG_SMP
 11 
 12 #include <asm/pda.h>
 13 
 14 #define __per_cpu_offset(cpu) (cpu_pda[cpu].data_offset)
 15 #define __my_cpu_offset() read_pda(data_offset)
 16 
 17 /* Separate out the type, so (int[3], foo) works. */
 18 #define DEFINE_PER_CPU(type, name) \
 19     __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
 20 
 21 /* var is in discarded region: offset to particular copy we want */
 22 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
 23 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
 24 
 25 /* A macro to avoid #include hell... */
 26 #define percpu_modcopy(pcpudst, src, size)                      \
 27 do {                                                            \
 28         unsigned int __i;                                       \
 29         for (__i = 0; __i < NR_CPUS; __i++)                     \
 30                 if (cpu_possible(__i))                          \
 31                         memcpy((pcpudst)+__per_cpu_offset(__i), \
 32                                (src), (size));                  \
 33 } while (0)
 34 
 35 extern void setup_per_cpu_areas(void);
 36 
 37 #else /* ! SMP */
 38 
 39 #define DEFINE_PER_CPU(type, name) \
 40     __typeof__(type) per_cpu__##name
 41 
 42 #define per_cpu(var, cpu)                       ((void)cpu, per_cpu__##var)
 43 #define __get_cpu_var(var)                      per_cpu__##var
 44 
 45 #endif  /* SMP */
 46 
 47 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
 48 
 49 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
 50 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
 51 
 52 #endif /* _ASM_X8664_PERCPU_H_ */
 53 

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