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Rev | Author | Line No. | Line |
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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 | |||
3480 | Serge | 16 | #if GCC_VERSION >= 40100 |
17 | # define __compiletime_object_size(obj) __builtin_object_size(obj, 0) |
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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 | |||
3243 | Serge | 68 | |
69 | #ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP |
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3480 | Serge | 70 | #if GCC_VERSION >= 40400 |
3243 | Serge | 71 | #define __HAVE_BUILTIN_BSWAP32__ |
72 | #define __HAVE_BUILTIN_BSWAP64__ |
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73 | #endif |
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3480 | Serge | 74 | #if GCC_VERSION >= 40800 || (defined(__powerpc__) && GCC_VERSION >= 40600) |
3243 | Serge | 75 | #define __HAVE_BUILTIN_BSWAP16__ |
76 | #endif |
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3480 | Serge | 77 | #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */=> |