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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __LINUX_COMPILER_H |
| 2 | #define __LINUX_COMPILER_H |
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| 3 | |||
| 4 | #ifdef __CHECKER__ |
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| 5 | # define __user __attribute__((noderef, address_space(1))) |
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| 6 | # define __kernel /* default address space */ |
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| 7 | #else |
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| 8 | # define __user |
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| 9 | # define __kernel |
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| 10 | #endif |
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| 11 | |||
| 12 | #ifndef __ASSEMBLY__ |
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| 13 | #if __GNUC__ > 3 |
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| 14 | # include <linux/compiler-gcc+.h> /* catch-all for GCC 4, 5, etc. */ |
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| 15 | #elif __GNUC__ == 3 |
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| 16 | # include <linux/compiler-gcc3.h> |
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| 17 | #elif __GNUC__ == 2 |
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| 18 | # include <linux/compiler-gcc2.h> |
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| 19 | #else |
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| 20 | # error Sorry, your compiler is too old/not recognized. |
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| 21 | #endif |
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| 22 | #endif |
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| 23 | |||
| 24 | /* Intel compiler defines __GNUC__. So we will overwrite implementations |
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| 25 | * coming from above header files here |
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| 26 | */ |
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| 27 | #ifdef __INTEL_COMPILER |
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| 28 | # include <linux/compiler-intel.h> |
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| 29 | #endif |
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| 30 | |||
| 31 | /* |
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| 32 | * Generic compiler-dependent macros required for kernel |
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| 33 | * build go below this comment. Actual compiler/compiler version |
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| 34 | * specific implementations come from the above header files |
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| 35 | */ |
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| 36 | |||
| 37 | #define likely(x) __builtin_expect(!!(x), 1) |
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| 38 | #define unlikely(x) __builtin_expect(!!(x), 0) |
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| 39 | |||
| 40 | /* |
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| 41 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice |
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| 42 | * warning for each use, in hopes of speeding the functions removal. |
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| 43 | * Usage is: |
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| 44 | * int __deprecated foo(void) |
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| 45 | */ |
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| 46 | #ifndef __deprecated |
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| 47 | # define __deprecated /* unimplemented */ |
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| 48 | #endif |
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| 49 | |||
| 50 | /* |
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| 51 | * Allow us to avoid 'defined but not used' warnings on functions and data, |
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| 52 | * as well as force them to be emitted to the assembly file. |
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| 53 | * |
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| 54 | * As of gcc 3.3, static functions that are not marked with attribute((used)) |
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| 55 | * may be elided from the assembly file. As of gcc 3.3, static data not so |
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| 56 | * marked will not be elided, but this may change in a future gcc version. |
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| 57 | * |
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| 58 | * In prior versions of gcc, such functions and data would be emitted, but |
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| 59 | * would be warned about except with attribute((unused)). |
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| 60 | */ |
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| 61 | #ifndef __attribute_used__ |
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| 62 | # define __attribute_used__ /* unimplemented */ |
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| 63 | #endif |
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| 64 | |||
| 65 | /* |
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| 66 | * From the GCC manual: |
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| 67 | * |
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| 68 | * Many functions have no effects except the return value and their |
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| 69 | * return value depends only on the parameters and/or global |
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| 70 | * variables. Such a function can be subject to common subexpression |
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| 71 | * elimination and loop optimization just as an arithmetic operator |
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| 72 | * would be. |
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| 73 | * [...] |
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| 74 | */ |
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| 75 | #ifndef __attribute_pure__ |
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| 76 | # define __attribute_pure__ /* unimplemented */ |
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| 77 | #endif |
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| 78 | |||
| 79 | /* Optimization barrier */ |
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| 80 | #ifndef barrier |
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| 81 | # define barrier() __memory_barrier() |
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| 82 | #endif |
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| 83 | |||
| 84 | #ifndef RELOC_HIDE |
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| 85 | # define RELOC_HIDE(ptr, off) \ |
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| 86 | ({ unsigned long __ptr; \ |
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| 87 | __ptr = (unsigned long) (ptr); \ |
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| 88 | (typeof(ptr)) (__ptr + (off)); }) |
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| 89 | #endif |
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| 90 | |||
| 91 | #endif /* __LINUX_COMPILER_H */ |