projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _ASM_X8664_PERCPU_H_ |
| 2 | #define _ASM_X8664_PERCPU_H_ | |
| 3 | #include <linux/compiler.h> | |
| 4 | ||
| 5 | /* Same as asm-generic/percpu.h, except that we store the per cpu offset | |
| 6 | in the PDA. Longer term the PDA and every per cpu variable | |
| 7 | should be just put into a single section and referenced directly | |
| 8 | from %gs */ | |
| 9 | ||
| 10 | #ifdef CONFIG_SMP | |
| 11 | ||
| 12 | #include <asm/pda.h> | |
| 13 | ||
| df79efde | 14 | #define __per_cpu_offset(cpu) (cpu_pda(cpu)->data_offset) |
| 1da177e4 LT |
15 | #define __my_cpu_offset() read_pda(data_offset) |
| 16 | ||
| a875a69f IM |
17 | #define per_cpu_offset(x) (__per_cpu_offset(x)) |
| 18 | ||
| 1da177e4 LT |
19 | /* Separate out the type, so (int[3], foo) works. */ |
| 20 | #define DEFINE_PER_CPU(type, name) \ | |
| 21 | __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name | |
| 22 | ||
| 5fb7dc37 FY |
23 | #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ |
| 24 | __attribute__((__section__(".data.percpu.shared_aligned"))) \ | |
| 25 | __typeof__(type) per_cpu__##name \ | |
| 26 | ____cacheline_internodealigned_in_smp | |
| 27 | ||
| 1da177e4 | 28 | /* var is in discarded region: offset to particular copy we want */ |
| 632bbfee | 29 | #define per_cpu(var, cpu) (*({ \ |
| a666ecfb | 30 | extern int simple_identifier_##var(void); \ |
| 632bbfee JB |
31 | RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)); })) |
| 32 | #define __get_cpu_var(var) (*({ \ | |
| a666ecfb | 33 | extern int simple_identifier_##var(void); \ |
| 632bbfee JB |
34 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
| 35 | #define __raw_get_cpu_var(var) (*({ \ | |
| a666ecfb | 36 | extern int simple_identifier_##var(void); \ |
| 632bbfee | 37 | RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()); })) |
| 1da177e4 LT |
38 | |
| 39 | /* A macro to avoid #include hell... */ | |
| 40 | #define percpu_modcopy(pcpudst, src, size) \ | |
| 41 | do { \ | |
| 42 | unsigned int __i; \ | |
| 676ff453 | 43 | for_each_possible_cpu(__i) \ |
| 394e3902 AM |
44 | memcpy((pcpudst)+__per_cpu_offset(__i), \ |
| 45 | (src), (size)); \ | |
| 1da177e4 LT |
46 | } while (0) |
| 47 | ||
| 48 | extern void setup_per_cpu_areas(void); | |
| 49 | ||
| 50 | #else /* ! SMP */ | |
| 51 | ||
| 52 | #define DEFINE_PER_CPU(type, name) \ | |
| 53 | __typeof__(type) per_cpu__##name | |
| 5fb7dc37 FY |
54 | #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ |
| 55 | DEFINE_PER_CPU(type, name) | |
| 1da177e4 | 56 | |
| 11c80c83 | 57 | #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) |
| 1da177e4 | 58 | #define __get_cpu_var(var) per_cpu__##var |
| bfe5d834 | 59 | #define __raw_get_cpu_var(var) per_cpu__##var |
| 1da177e4 LT |
60 | |
| 61 | #endif /* SMP */ | |
| 62 | ||
| 63 | #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name | |
| 64 | ||
| 65 | #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var) | |
| 66 | #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var) | |
| 67 | ||
| 68 | #endif /* _ASM_X8664_PERCPU_H_ */ |