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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 | ||
a875a69f IM |
10 | #define per_cpu_offset(x) (__per_cpu_offset[x]) |
11 | ||
1da177e4 LT |
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 */ | |
632bbfee | 17 | #define per_cpu(var, cpu) (*({ \ |
a666ecfb | 18 | extern int simple_identifier_##var(void); \ |
632bbfee | 19 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); })) |
1da177e4 | 20 | #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) |
bfe5d834 | 21 | #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) |
1da177e4 LT |
22 | |
23 | /* A macro to avoid #include hell... */ | |
24 | #define percpu_modcopy(pcpudst, src, size) \ | |
25 | do { \ | |
26 | unsigned int __i; \ | |
0a945022 | 27 | for_each_possible_cpu(__i) \ |
394e3902 AM |
28 | memcpy((pcpudst)+__per_cpu_offset[__i], \ |
29 | (src), (size)); \ | |
1da177e4 LT |
30 | } while (0) |
31 | #else /* ! SMP */ | |
32 | ||
33 | #define DEFINE_PER_CPU(type, name) \ | |
34 | __typeof__(type) per_cpu__##name | |
35 | ||
11c80c83 | 36 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
1da177e4 | 37 | #define __get_cpu_var(var) per_cpu__##var |
bfe5d834 | 38 | #define __raw_get_cpu_var(var) per_cpu__##var |
1da177e4 LT |
39 | |
40 | #endif /* SMP */ | |
41 | ||
42 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
43 | ||
44 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
45 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
46 | ||
47 | #endif /* _ASM_GENERIC_PERCPU_H_ */ |