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1da177e4 LT |
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 (__i = 0; __i < NR_CPUS; __i++) \ | |
23 | if (cpu_possible(__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 | ||
11c80c83 | 32 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
1da177e4 LT |
33 | #define __get_cpu_var(var) per_cpu__##var |
34 | ||
35 | #endif /* SMP */ | |
36 | ||
37 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
38 | ||
39 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
40 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
41 | ||
42 | #endif /* _ASM_GENERIC_PERCPU_H_ */ |