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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
8extern unsigned long __per_cpu_offset[NR_CPUS];
9
10#define per_cpu_offset(x) (__per_cpu_offset[x])
11
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 */
17#define per_cpu(var, cpu) (*({ \
18 extern int simple_identifier_##var(void); \
19 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
20#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
21#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
22
23/* A macro to avoid #include hell... */
24#define percpu_modcopy(pcpudst, src, size) \
25do { \
26 unsigned int __i; \
27 for_each_possible_cpu(__i) \
28 memcpy((pcpudst)+__per_cpu_offset[__i], \
29 (src), (size)); \
30} while (0)
31#else /* ! SMP */
32
33#define DEFINE_PER_CPU(type, name) \
34 __typeof__(type) per_cpu__##name
35
36#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
37#define __get_cpu_var(var) per_cpu__##var
38#define __raw_get_cpu_var(var) per_cpu__##var
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_ */