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> |
Rusty Russell | ae1ee11 | 2007-05-02 19:27:10 +0200 | [diff] [blame] | 4 | #include <linux/threads.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #ifdef CONFIG_SMP |
| 7 | |
| 8 | extern unsigned long __per_cpu_offset[NR_CPUS]; |
| 9 | |
Ingo Molnar | a875a69 | 2006-07-03 00:24:26 -0700 | [diff] [blame] | 10 | #define per_cpu_offset(x) (__per_cpu_offset[x]) |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | /* var is in discarded region: offset to particular copy we want */ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 13 | #define per_cpu(var, cpu) (*({ \ |
Jan Blunck | a666ecf | 2006-10-06 00:43:58 -0700 | [diff] [blame] | 14 | extern int simple_identifier_##var(void); \ |
Jan Blunck | 632bbfe | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 15 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]); })) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #define __get_cpu_var(var) per_cpu(var, smp_processor_id()) |
Paul Mackerras | bfe5d83 | 2006-06-25 05:47:14 -0700 | [diff] [blame] | 17 | #define __raw_get_cpu_var(var) per_cpu(var, raw_smp_processor_id()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | /* A macro to avoid #include hell... */ |
| 20 | #define percpu_modcopy(pcpudst, src, size) \ |
| 21 | do { \ |
| 22 | unsigned int __i; \ |
KAMEZAWA Hiroyuki | 0a94502 | 2006-03-28 01:56:37 -0800 | [diff] [blame] | 23 | for_each_possible_cpu(__i) \ |
Andrew Morton | 394e390 | 2006-03-23 03:01:05 -0800 | [diff] [blame] | 24 | memcpy((pcpudst)+__per_cpu_offset[__i], \ |
| 25 | (src), (size)); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | } while (0) |
| 27 | #else /* ! SMP */ |
| 28 | |
Jan Beulich | 11c80c8 | 2005-06-23 00:09:59 -0700 | [diff] [blame] | 29 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #define __get_cpu_var(var) per_cpu__##var |
Paul Mackerras | bfe5d83 | 2006-06-25 05:47:14 -0700 | [diff] [blame] | 31 | #define __raw_get_cpu_var(var) per_cpu__##var |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #endif /* SMP */ |
| 34 | |
| 35 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #endif /* _ASM_GENERIC_PERCPU_H_ */ |