Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 8 | extern unsigned long __per_cpu_offset[NR_CPUS]; |
| 9 | |
| 10 | /* Separate out the type, so (int[3], foo) works. */ |
| 11 | #define DEFINE_PER_CPU(type, name) \ |
| 12 | __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name |
| 13 | |
| 14 | /* var is in discarded region: offset to particular copy we want */ |
| 15 | #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu])) |
| 16 | #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) |
| 17 | |
| 18 | /* A macro to avoid #include hell... */ |
| 19 | #define percpu_modcopy(pcpudst, src, size) \ |
| 20 | do { \ |
| 21 | unsigned int __i; \ |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 22 | for_each_cpu(__i) \ |
| 23 | memcpy((pcpudst)+__per_cpu_offset[__i], \ |
| 24 | (src), (size)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | } while (0) |
| 26 | #else /* ! SMP */ |
| 27 | |
| 28 | #define DEFINE_PER_CPU(type, name) \ |
| 29 | __typeof__(type) per_cpu__##name |
| 30 | |
Jan Beulich | 11c80c8 | 2005-06-23 00:09:59 -0700 | [diff] [blame] | 31 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define __get_cpu_var(var) per_cpu__##var |
| 33 | |
| 34 | #endif /* SMP */ |
| 35 | |
| 36 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name |
| 37 | |
| 38 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) |
| 39 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) |
| 40 | |
| 41 | #endif /* _ASM_GENERIC_PERCPU_H_ */ |