#ifndef __LINUX_COMPILER_H #define __LINUX_COMPILER_H #ifndef __ASSEMBLY__ #ifdef __CHECKER__ # define __user __attribute__((noderef, address_space(1))) # define __kernel /* default address space */ # define __safe __attribute__((safe)) # define __force __attribute__((force)) # define __nocast __attribute__((nocast)) # define __iomem __attribute__((noderef, address_space(2))) # define __acquires(x) __attribute__((context(0,1))) # define __releases(x) __attribute__((context(1,0))) # define __acquire(x) __context__(1) # define __release(x) __context__(-1) # define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0) extern void __chk_user_ptr(void __user *); extern void __chk_io_ptr(void __iomem *); #else # define __user # define __kernel # define __safe # define __force # define __nocast # define __iomem # define __chk_user_ptr(x) (void)0 # define __chk_io_ptr(x) (void)0 # define __builtin_warning(x, y...) (1) # define __acquires(x) # define __releases(x) # define __acquire(x) (void)0 # define __release(x) (void)0 # define __cond_lock(x) (x) #endif #ifdef __KERNEL__ #if __GNUC__ > 4 #error no compiler-gcc.h file for this gcc version #elif __GNUC__ == 4 # include <linux/compiler-gcc4.h> #elif __GNUC__ == 3 # include <linux/compiler-gcc3.h> #else # error Sorry, your compiler is too old/not recognized. #endif /* Intel compiler defines __GNUC__. So we will overwrite implementations * coming from above header files here */ #ifdef __INTEL_COMPILER # include <linux/compiler-intel.h> #endif /* * Generic compiler-dependent macros required for kernel * build go below this comment. Actual compiler/compiler version * specific implementations come from the above header files */ #define likely(x) __builtin_expect(!!(x), 1) #define unlikely(x) __builtin_expect(!!(x), 0) /* Optimization barrier */ #ifndef barrier # define barrier() __memory_barrier() #endif #ifndef RELOC_HIDE # define RELOC_HIDE(ptr, off) \ ({ unsigned long __ptr; \ __ptr = (unsigned long) (ptr); \ (typeof(ptr)) (__ptr + (off)); }) #endif #endif /* __KERNEL__ */ #endif /* __ASSEMBLY__ */ #ifdef __KERNEL__ /* * Allow us to mark functions as 'deprecated' and have gcc emit a nice * warning for each use, in hopes of speeding the functions removal. * Usage is: * int __deprecated foo(void) */ #ifndef __deprecated # define __deprecated /* unimplemented */ #endif #ifdef MODULE #define __deprecated_for_modules __deprecated #else #define __deprecated_for_modules #endif #ifndef __must_check #define __must_check #endif #ifndef CONFIG_ENABLE_MUST_CHECK #undef __must_check #define __must_check #endif /* * Allow us to avoid 'defined but not used' warnings on functions and data, * as well as force them to be emitted to the assembly file. * * As of gcc 3.3, static functions that are not marked with attribute((used)) * may be elided from the assembly file. As of gcc 3.3, static data not so * marked will not be elided, but this may change in a future gcc version. * * In prior versions of gcc, such functions and data would be emitted, but * would be warned about except with attribute((unused)). */ #ifndef __attribute_used__ # define __attribute_used__ /* unimplemented */ #endif /* * From the GCC manual: * * Many functions have no effects except the return value and their * return value depends only on the parameters and/or global * variables. Such a function can be subject to common subexpression * elimination and loop optimization just as an arithmetic operator * would be. * [...] */ #ifndef __attribute_pure__ # define __attribute_pure__ /* unimplemented */ #endif #ifndef noinline #define noinline #endif #ifndef __always_inline #define __always_inline inline #endif #endif /* __KERNEL__ */ /* * From the GCC manual: * * Many functions do not examine any values except their arguments, * and have no effects except the return value. Basically this is * just slightly more strict class than the `pure' attribute above, * since function is not allowed to read global memory. * * Note that a function that has pointer arguments and examines the * data pointed to must _not_ be declared `const'. Likewise, a * function that calls a non-`const' function usually must not be * `const'. It does not make sense for a `const' function to return * `void'. */ #ifndef __attribute_const__ # define __attribute_const__ /* unimplemented */ #endif #endif /* __LINUX_COMPILER_H */