1 #ifndef __LINUX_COMPILER_H 2 #define __LINUX_COMPILER_H 3 4 #ifndef __ASSEMBLY__ 5 6 #ifdef __CHECKER__ 7 # define __user __attribute__((noderef, address_space(1))) 8 # define __kernel /* default address space */ 9 # define __safe __attribute__((safe)) 10 # define __force __attribute__((force)) 11 # define __nocast __attribute__((nocast)) 12 # define __iomem __attribute__((noderef, address_space(2))) 13 # define __acquires(x) __attribute__((context(0,1))) 14 # define __releases(x) __attribute__((context(1,0))) 15 # define __acquire(x) __context__(1) 16 # define __release(x) __context__(-1) 17 # define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0) 18 extern void __chk_user_ptr(void __user *); 19 extern void __chk_io_ptr(void __iomem *); 20 #else 21 # define __user 22 # define __kernel 23 # define __safe 24 # define __force 25 # define __nocast 26 # define __iomem 27 # define __chk_user_ptr(x) (void)0 28 # define __chk_io_ptr(x) (void)0 29 # define __builtin_warning(x, y...) (1) 30 # define __acquires(x) 31 # define __releases(x) 32 # define __acquire(x) (void)0 33 # define __release(x) (void)0 34 # define __cond_lock(x) (x) 35 #endif 36 37 #ifdef __KERNEL__ 38 39 #if __GNUC__ > 4 40 #error no compiler-gcc.h file for this gcc version 41 #elif __GNUC__ == 4 42 # include <linux/compiler-gcc4.h> 43 #elif __GNUC__ == 3 44 # include <linux/compiler-gcc3.h> 45 #else 46 # error Sorry, your compiler is too old/not recognized. 47 #endif 48 49 /* Intel compiler defines __GNUC__. So we will overwrite implementations 50 * coming from above header files here 51 */ 52 #ifdef __INTEL_COMPILER 53 # include <linux/compiler-intel.h> 54 #endif 55 56 /* 57 * Generic compiler-dependent macros required for kernel 58 * build go below this comment. Actual compiler/compiler version 59 * specific implementations come from the above header files 60 */ 61 62 #define likely(x) __builtin_expect(!!(x), 1) 63 #define unlikely(x) __builtin_expect(!!(x), 0) 64 65 /* Optimization barrier */ 66 #ifndef barrier 67 # define barrier() __memory_barrier() 68 #endif 69 70 #ifndef RELOC_HIDE 71 # define RELOC_HIDE(ptr, off) \ 72 ({ unsigned long __ptr; \ 73 __ptr = (unsigned long) (ptr); \ 74 (typeof(ptr)) (__ptr + (off)); }) 75 #endif 76 77 #endif /* __KERNEL__ */ 78 79 #endif /* __ASSEMBLY__ */ 80 81 #ifdef __KERNEL__ 82 /* 83 * Allow us to mark functions as 'deprecated' and have gcc emit a nice 84 * warning for each use, in hopes of speeding the functions removal. 85 * Usage is: 86 * int __deprecated foo(void) 87 */ 88 #ifndef __deprecated 89 # define __deprecated /* unimplemented */ 90 #endif 91 92 #ifdef MODULE 93 #define __deprecated_for_modules __deprecated 94 #else 95 #define __deprecated_for_modules 96 #endif 97 98 #ifndef __must_check 99 #define __must_check 100 #endif 101 102 /* 103 * Allow us to avoid 'defined but not used' warnings on functions and data, 104 * as well as force them to be emitted to the assembly file. 105 * 106 * As of gcc 3.3, static functions that are not marked with attribute((used)) 107 * may be elided from the assembly file. As of gcc 3.3, static data not so 108 * marked will not be elided, but this may change in a future gcc version. 109 * 110 * In prior versions of gcc, such functions and data would be emitted, but 111 * would be warned about except with attribute((unused)). 112 */ 113 #ifndef __attribute_used__ 114 # define __attribute_used__ /* unimplemented */ 115 #endif 116 117 /* 118 * From the GCC manual: 119 * 120 * Many functions have no effects except the return value and their 121 * return value depends only on the parameters and/or global 122 * variables. Such a function can be subject to common subexpression 123 * elimination and loop optimization just as an arithmetic operator 124 * would be. 125 * [...] 126 */ 127 #ifndef __attribute_pure__ 128 # define __attribute_pure__ /* unimplemented */ 129 #endif 130 131 #ifndef noinline 132 #define noinline 133 #endif 134 135 #ifndef __always_inline 136 #define __always_inline inline 137 #endif 138 139 #endif /* __KERNEL__ */ 140 141 /* 142 * From the GCC manual: 143 * 144 * Many functions do not examine any values except their arguments, 145 * and have no effects except the return value. Basically this is 146 * just slightly more strict class than the `pure' attribute above, 147 * since function is not allowed to read global memory. 148 * 149 * Note that a function that has pointer arguments and examines the 150 * data pointed to must _not_ be declared `const'. Likewise, a 151 * function that calls a non-`const' function usually must not be 152 * `const'. It does not make sense for a `const' function to return 153 * `void'. 154 */ 155 #ifndef __attribute_const__ 156 # define __attribute_const__ /* unimplemented */ 157 #endif 158 159 #endif /* __LINUX_COMPILER_H */ 160
