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 #elif __GNUC__ == 2 46 # include <linux/compiler-gcc2.h> 47 #else 48 # error Sorry, your compiler is too old/not recognized. 49 #endif 50 51 /* Intel compiler defines __GNUC__. So we will overwrite implementations 52 * coming from above header files here 53 */ 54 #ifdef __INTEL_COMPILER 55 # include <linux/compiler-intel.h> 56 #endif 57 58 /* 59 * Generic compiler-dependent macros required for kernel 60 * build go below this comment. Actual compiler/compiler version 61 * specific implementations come from the above header files 62 */ 63 64 #define likely(x) __builtin_expect(!!(x), 1) 65 #define unlikely(x) __builtin_expect(!!(x), 0) 66 67 /* Optimization barrier */ 68 #ifndef barrier 69 # define barrier() __memory_barrier() 70 #endif 71 72 #ifndef RELOC_HIDE 73 # define RELOC_HIDE(ptr, off) \ 74 ({ unsigned long __ptr; \ 75 __ptr = (unsigned long) (ptr); \ 76 (typeof(ptr)) (__ptr + (off)); }) 77 #endif 78 79 #endif /* __KERNEL__ */ 80 81 #endif /* __ASSEMBLY__ */ 82 83 /* 84 * Allow us to mark functions as 'deprecated' and have gcc emit a nice 85 * warning for each use, in hopes of speeding the functions removal. 86 * Usage is: 87 * int __deprecated foo(void) 88 */ 89 #ifndef __deprecated 90 # define __deprecated /* unimplemented */ 91 #endif 92 93 #ifndef __must_check 94 #define __must_check 95 #endif 96 97 /* 98 * Allow us to avoid 'defined but not used' warnings on functions and data, 99 * as well as force them to be emitted to the assembly file. 100 * 101 * As of gcc 3.3, static functions that are not marked with attribute((used)) 102 * may be elided from the assembly file. As of gcc 3.3, static data not so 103 * marked will not be elided, but this may change in a future gcc version. 104 * 105 * In prior versions of gcc, such functions and data would be emitted, but 106 * would be warned about except with attribute((unused)). 107 */ 108 #ifndef __attribute_used__ 109 # define __attribute_used__ /* unimplemented */ 110 #endif 111 112 /* 113 * From the GCC manual: 114 * 115 * Many functions have no effects except the return value and their 116 * return value depends only on the parameters and/or global 117 * variables. Such a function can be subject to common subexpression 118 * elimination and loop optimization just as an arithmetic operator 119 * would be. 120 * [...] 121 */ 122 #ifndef __attribute_pure__ 123 # define __attribute_pure__ /* unimplemented */ 124 #endif 125 126 /* 127 * From the GCC manual: 128 * 129 * Many functions do not examine any values except their arguments, 130 * and have no effects except the return value. Basically this is 131 * just slightly more strict class than the `pure' attribute above, 132 * since function is not allowed to read global memory. 133 * 134 * Note that a function that has pointer arguments and examines the 135 * data pointed to must _not_ be declared `const'. Likewise, a 136 * function that calls a non-`const' function usually must not be 137 * `const'. It does not make sense for a `const' function to return 138 * `void'. 139 */ 140 #ifndef __attribute_const__ 141 # define __attribute_const__ /* unimplemented */ 142 #endif 143 144 #ifndef noinline 145 #define noinline 146 #endif 147 148 #ifndef __always_inline 149 #define __always_inline inline 150 #endif 151 152 #endif /* __LINUX_COMPILER_H */ 153