Commit | Line | Data |
---|---|---|
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 | 5 | |
1da177e4 LT |
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 | ||
5fb7dc37 FY |
16 | #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ |
17 | __attribute__((__section__(".data.percpu.shared_aligned"))) \ | |
18 | __typeof__(type) per_cpu__##name \ | |
19 | ____cacheline_aligned_in_smp | |
20 | ||
1da177e4 | 21 | /* var is in discarded region: offset to particular copy we want */ |
632bbfee | 22 | #define per_cpu(var, cpu) (*({ \ |
a666ecfb | 23 | extern int simple_identifier_##var(void); \ |
632bbfee | 24 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); })) |
1da177e4 | 25 | #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) |
bfe5d834 | 26 | #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) |
1da177e4 LT |
27 | |
28 | /* A macro to avoid #include hell... */ | |
29 | #define percpu_modcopy(pcpudst, src, size) \ | |
30 | do { \ | |
31 | unsigned int __i; \ | |
0a945022 | 32 | for_each_possible_cpu(__i) \ |
394e3902 AM |
33 | memcpy((pcpudst)+__per_cpu_offset[__i], \ |
34 | (src), (size)); \ | |
1da177e4 LT |
35 | } while (0) |
36 | #else /* ! SMP */ | |
37 | ||
38 | #define DEFINE_PER_CPU(type, name) \ | |
39 | __typeof__(type) per_cpu__##name | |
40 | ||
5fb7dc37 FY |
41 | #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ |
42 | DEFINE_PER_CPU(type, name) | |
43 | ||
11c80c83 | 44 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
1da177e4 | 45 | #define __get_cpu_var(var) per_cpu__##var |
bfe5d834 | 46 | #define __raw_get_cpu_var(var) per_cpu__##var |
1da177e4 LT |
47 | |
48 | #endif /* SMP */ | |
49 | ||
50 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
51 | ||
52 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
53 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
54 | ||
55 | #endif /* _ASM_GENERIC_PERCPU_H_ */ |