1#ifndef _ASM_GENERIC_PERCPU_H_ 2#define _ASM_GENERIC_PERCPU_H_ 3#include <linux/compiler.h> 4#include <linux/threads.h> 5 6#define __GENERIC_PER_CPU 7#ifdef CONFIG_SMP 8 9extern unsigned long __per_cpu_offset[NR_CPUS]; 10 11#define per_cpu_offset(x) (__per_cpu_offset[x]) 12 13/* Separate out the type, so (int[3], foo) works. */ 14#define DEFINE_PER_CPU(type, name) \ 15 __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name 16 17/* var is in discarded region: offset to particular copy we want */ 18#define per_cpu(var, cpu) (*({ \ 19 extern int simple_identifier_##var(void); \ 20 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); })) 21#define __get_cpu_var(var) per_cpu(var, smp_processor_id()) 22#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) 23 24/* A macro to avoid #include hell... */ 25#define percpu_modcopy(pcpudst, src, size) \ 26do { \ 27 unsigned int __i; \ 28 for_each_possible_cpu(__i) \ 29 memcpy((pcpudst)+__per_cpu_offset[__i], \ 30 (src), (size)); \ 31} while (0) 32#else /* ! SMP */ 33 34#define DEFINE_PER_CPU(type, name) \ 35 __typeof__(type) per_cpu__##name 36 37#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) 38#define __get_cpu_var(var) per_cpu__##var 39#define __raw_get_cpu_var(var) per_cpu__##var 40 41#endif /* SMP */ 42 43#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name 44 45#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) 46#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) 47 48#endif /* _ASM_GENERIC_PERCPU_H_ */ 49