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1da177e4 LT |
1 | #ifndef _ASM_GENERIC_PERCPU_H_ |
2 | #define _ASM_GENERIC_PERCPU_H_ | |
3 | #include <linux/compiler.h> | |
ae1ee11b | 4 | #include <linux/threads.h> |
1da177e4 LT |
5 | |
6 | #define __GENERIC_PER_CPU | |
7 | #ifdef CONFIG_SMP | |
8 | ||
9 | extern unsigned long __per_cpu_offset[NR_CPUS]; | |
10 | ||
a875a69f IM |
11 | #define per_cpu_offset(x) (__per_cpu_offset[x]) |
12 | ||
1da177e4 LT |
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 */ | |
632bbfee | 18 | #define per_cpu(var, cpu) (*({ \ |
a666ecfb | 19 | extern int simple_identifier_##var(void); \ |
632bbfee | 20 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); })) |
1da177e4 | 21 | #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) |
bfe5d834 | 22 | #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) |
1da177e4 LT |
23 | |
24 | /* A macro to avoid #include hell... */ | |
25 | #define percpu_modcopy(pcpudst, src, size) \ | |
26 | do { \ | |
27 | unsigned int __i; \ | |
0a945022 | 28 | for_each_possible_cpu(__i) \ |
394e3902 AM |
29 | memcpy((pcpudst)+__per_cpu_offset[__i], \ |
30 | (src), (size)); \ | |
1da177e4 LT |
31 | } while (0) |
32 | #else /* ! SMP */ | |
33 | ||
34 | #define DEFINE_PER_CPU(type, name) \ | |
35 | __typeof__(type) per_cpu__##name | |
36 | ||
11c80c83 | 37 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
1da177e4 | 38 | #define __get_cpu_var(var) per_cpu__##var |
bfe5d834 | 39 | #define __raw_get_cpu_var(var) per_cpu__##var |
1da177e4 LT |
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_ */ |