d984a90414361b8f087cfcc83e8f15b3dcbe2989
[linux-2.6.git] / include / asm-generic / percpu.h
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
9 extern 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)                      \
26 do {                                                            \
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_ */