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 #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) 18 19 /* A macro to avoid #include hell... */ 20 #define percpu_modcopy(pcpudst, src, size) \ 21 do { \ 22 unsigned int __i; \ 23 for_each_possible_cpu(__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 #define __raw_get_cpu_var(var) per_cpu__##var 35 36 #endif /* SMP */ 37 38 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name 39 40 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) 41 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) 42 43 #endif /* _ASM_GENERIC_PERCPU_H_ */ 44