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) 18extern void __chk_user_ptr(void __user *); 19extern 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