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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1408 | serge | 1 | #ifndef __LINUX_COMPILER_H |
| 2 | #error "Please don't include |
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| 3 | #endif |
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| 4 | |||
| 5 | /* GCC 4.1.[01] miscompiles __weak */ |
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| 6 | #ifdef __KERNEL__ |
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| 3480 | Serge | 7 | # if GCC_VERSION >= 40100 && GCC_VERSION <= 40101 |
| 1408 | serge | 8 | # error Your version of gcc miscompiles the __weak directive |
| 9 | # endif |
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| 10 | #endif |
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| 11 | |||
| 12 | #define __used __attribute__((__used__)) |
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| 13 | #define __must_check __attribute__((warn_unused_result)) |
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| 14 | #define __compiler_offsetof(a,b) __builtin_offsetof(a,b) |
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| 15 | |||
| 4065 | Serge | 16 | #if GCC_VERSION >= 40100 && GCC_VERSION < 40600 |
| 3480 | Serge | 17 | # define __compiletime_object_size(obj) __builtin_object_size(obj, 0) |
| 18 | #endif |
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| 19 | |||
| 20 | #if GCC_VERSION >= 40300 |
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| 1408 | serge | 21 | /* Mark functions as cold. gcc will assume any path leading to a call |
| 22 | to them will be unlikely. This means a lot of manual unlikely()s |
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| 23 | are unnecessary now for any paths leading to the usual suspects |
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| 24 | like BUG(), printk(), panic() etc. [but let's keep them for now for |
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| 25 | older compilers] |
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| 26 | |||
| 27 | Early snapshots of gcc 4.3 don't support this and we can't detect this |
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| 28 | in the preprocessor, but we can live with this because they're unreleased. |
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| 29 | Maketime probing would be overkill here. |
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| 30 | |||
| 31 | gcc also has a __attribute__((__hot__)) to move hot functions into |
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| 32 | a special section, but I don't see any sense in this right now in |
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| 33 | the kernel context */ |
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| 34 | #define __cold __attribute__((__cold__)) |
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| 35 | |||
| 3480 | Serge | 36 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
| 1408 | serge | 37 | |
| 3480 | Serge | 38 | #ifndef __CHECKER__ |
| 39 | # define __compiletime_warning(message) __attribute__((warning(message))) |
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| 40 | # define __compiletime_error(message) __attribute__((error(message))) |
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| 41 | #endif /* __CHECKER__ */ |
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| 42 | #endif /* GCC_VERSION >= 40300 */ |
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| 43 | |||
| 44 | #if GCC_VERSION >= 40500 |
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| 1408 | serge | 45 | /* |
| 46 | * Mark a position in code as unreachable. This can be used to |
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| 47 | * suppress control flow warnings after asm blocks that transfer |
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| 48 | * control elsewhere. |
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| 49 | * |
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| 50 | * Early snapshots of gcc 4.5 don't support this and we can't detect |
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| 51 | * this in the preprocessor, but we can live with this because they're |
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| 52 | * unreleased. Really, we need to have autoconf for the kernel. |
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| 53 | */ |
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| 54 | #define unreachable() __builtin_unreachable() |
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| 1964 | serge | 55 | |
| 56 | /* Mark a function definition as prohibited from being cloned. */ |
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| 57 | #define __noclone __attribute__((__noclone__)) |
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| 58 | |||
| 3480 | Serge | 59 | #endif /* GCC_VERSION >= 40500 */ |
| 1408 | serge | 60 | |
| 3480 | Serge | 61 | #if GCC_VERSION >= 40600 |
| 3031 | serge | 62 | /* |
| 63 | * Tell the optimizer that something else uses this function or variable. |
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| 64 | */ |
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| 65 | #define __visible __attribute__((externally_visible)) |
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| 66 | #endif |
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| 67 | |||
| 4103 | Serge | 68 | /* |
| 69 | * GCC 'asm goto' miscompiles certain code sequences: |
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| 70 | * |
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| 71 | * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 |
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| 72 | * |
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| 73 | * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. |
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| 74 | * |
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| 75 | * (asm goto is automatically volatile - the naming reflects this.) |
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| 76 | */ |
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| 5056 | serge | 77 | #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) |
| 3243 | Serge | 78 | |
| 79 | #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
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| 3480 | Serge | 80 | #if GCC_VERSION >= 40400 |
| 3243 | Serge | 81 | #define __HAVE_BUILTIN_BSWAP32__ |
| 82 | #define __HAVE_BUILTIN_BSWAP64__ |
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| 83 | #endif |
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| 3480 | Serge | 84 | #if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600) |
| 3243 | Serge | 85 | #define __HAVE_BUILTIN_BSWAP16__ |
| 86 | #endif |
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| 3480 | Serge | 87 | #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |