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