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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Ingo Molnara875a692006-07-03 00:24:26 -070010#define per_cpu_offset(x) (__per_cpu_offset[x])
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012/* 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 */
Jan Blunck632bbfe2006-09-25 23:30:53 -070017#define per_cpu(var, cpu) (*({ \
Jan Bluncka666ecf2006-10-06 00:43:58 -070018 extern int simple_identifier_##var(void); \
Jan Blunck632bbfe2006-09-25 23:30:53 -070019 RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); }))
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#define __get_cpu_var(var) per_cpu(var, smp_processor_id())
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070021#define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id())
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23/* A macro to avoid #include hell... */
24#define percpu_modcopy(pcpudst, src, size) \
25do { \
26 unsigned int __i; \
KAMEZAWA Hiroyuki0a945022006-03-28 01:56:37 -080027 for_each_possible_cpu(__i) \
Andrew Morton394e3902006-03-23 03:01:05 -080028 memcpy((pcpudst)+__per_cpu_offset[__i], \
29 (src), (size)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -070030} while (0)
31#else /* ! SMP */
32
33#define DEFINE_PER_CPU(type, name) \
34 __typeof__(type) per_cpu__##name
35
Jan Beulich11c80c82005-06-23 00:09:59 -070036#define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var))
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#define __get_cpu_var(var) per_cpu__##var
Paul Mackerrasbfe5d832006-06-25 05:47:14 -070038#define __raw_get_cpu_var(var) per_cpu__##var
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
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_ */