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 #define per_cpu_offset(x) (__per_cpu_offset[x]) 11 12 /* Separate out the type, so (int[3], foo) works. */ 13 #define DEFINE_PER_CPU(type, name) \ 14 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name 15 16 /* var is in discarded region: offset to particular copy we want */ 17 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) 18 #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) 19 #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) 20 21 /* A macro to avoid #include hell... */ 22 #define percpu_modcopy(pcpudst, src, size) \ 23 do { \ 24 unsigned int __i; \ 25 for_each_possible_cpu(__i) \ 26 memcpy((pcpudst)+__per_cpu_offset[__i], \ 27 (src), (size)); \ 28 } while (0) 29 #else /* ! SMP */ 30 31 #define DEFINE_PER_CPU(type, name) \ 32 __typeof__(type) per_cpu__##name 33 34 #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) 35 #define __get_cpu_var(var) per_cpu__##var 36 #define __raw_get_cpu_var(var) per_cpu__##var 37 38 #endif /* SMP */ 39 40 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name 41 42 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) 43 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) 44 45 #endif /* _ASM_GENERIC_PERCPU_H_ */ 46
