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