diff options
Diffstat (limited to 'include/linux/compiler.h')
| -rw-r--r-- | include/linux/compiler.h | 72 |
1 files changed, 39 insertions, 33 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 356428f649fc..528641f69043 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -2,28 +2,36 @@ #define __LINUX_COMPILER_H #ifdef __CHECKER__ - #define __user __attribute__((noderef, address_space(1))) - #define __kernel /* default address space */ +# define __user __attribute__((noderef, address_space(1))) +# define __kernel /* default address space */ #else - #define __user - #define __kernel +# define __user +# define __kernel #endif -#if (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1) -#define inline __inline__ __attribute__((always_inline)) -#define __inline__ __inline__ __attribute__((always_inline)) -#define __inline __inline__ __attribute__((always_inline)) +#if __GNUC__ > 3 +# include <linux/compiler-gcc+.h> /* catch-all for GCC 4, 5, etc. */ +#elif __GNUC__ == 3 +# include <linux/compiler-gcc3.h> +#elif __GNUC__ == 2 +# include <linux/compiler-gcc2.h> +#else +# error Sorry, your compiler is too old/not recognized. #endif -/* Somewhere in the middle of the GCC 2.96 development cycle, we implemented - a mechanism by which the user can annotate likely branch directions and - expect the blocks to be reordered appropriately. Define __builtin_expect - to nothing for earlier compilers. */ - -#if __GNUC__ == 2 && __GNUC_MINOR__ < 96 -#define __builtin_expect(x, expected_value) (x) +/* 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) @@ -33,10 +41,8 @@ * Usage is: * int __deprecated foo(void) */ -#if ( __GNUC__ == 3 && __GNUC_MINOR__ > 0 ) || __GNUC__ > 3 -#define __deprecated __attribute__((deprecated)) -#else -#define __deprecated +#ifndef __deprecated +# define __deprecated /* unimplemented */ #endif /* @@ -50,10 +56,8 @@ * In prior versions of gcc, such functions and data would be emitted, but * would be warned about except with attribute((unused)). */ -#if __GNUC__ == 3 && __GNUC_MINOR__ >= 3 || __GNUC__ > 3 -#define __attribute_used__ __attribute__((__used__)) -#else -#define __attribute_used__ __attribute__((__unused__)) +#ifndef __attribute_used__ +# define __attribute_used__ /* unimplemented */ #endif /* @@ -65,19 +69,21 @@ * elimination and loop optimization just as an arithmetic operator * would be. * [...] - * The attribute `pure' is not implemented in GCC versions earlier - * than 2.96. */ -#if (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) || __GNUC__ > 2 -#define __attribute_pure__ __attribute__((pure)) -#else -#define __attribute_pure__ /* unimplemented */ +#ifndef __attribute_pure__ +# define __attribute_pure__ /* unimplemented */ +#endif + +/* Optimization barrier */ +#ifndef barrier +# define barrier() __memory_barrier() #endif -/* This macro obfuscates arithmetic on a variable address so that gcc - shouldn't recognize the original var, and make assumptions about it */ -#define RELOC_HIDE(ptr, off) \ +#ifndef RELOC_HIDE +# define RELOC_HIDE(ptr, off) \ ({ unsigned long __ptr; \ - __asm__ ("" : "=g"(__ptr) : "0"(ptr)); \ + __ptr = (unsigned long) (ptr); \ (typeof(ptr)) (__ptr + (off)); }) +#endif + #endif /* __LINUX_COMPILER_H */ |