1 #ifndef __LINUX_COMPILER_H
2 #define __LINUX_COMPILER_H
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(x,0,1)))
14 # define __releases(x) __attribute__((context(x,1,0)))
15 # define __acquire(x) __context__(x,1)
16 # define __release(x) __context__(x,-1)
17 # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
18 extern void __chk_user_ptr(const volatile void __user *);
19 extern void __chk_io_ptr(const volatile void __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,c) (c)
40 # include <linux/compiler-gcc4.h>
41 #elif __GNUC__ == 3 && __GNUC_MINOR__ >= 2
42 # include <linux/compiler-gcc3.h>
44 # error Sorry, your compiler is too old/not recognized.
47 /* Intel compiler defines __GNUC__. So we will overwrite implementations
48 * coming from above header files here
50 #ifdef __INTEL_COMPILER
51 # include <linux/compiler-intel.h>
55 * Generic compiler-dependent macros required for kernel
56 * build go below this comment. Actual compiler/compiler version
57 * specific implementations come from the above header files
60 #define likely(x) __builtin_expect(!!(x), 1)
61 #define unlikely(x) __builtin_expect(!!(x), 0)
63 /* Optimization barrier */
65 # define barrier() __memory_barrier()
69 # define RELOC_HIDE(ptr, off) \
70 ({ unsigned long __ptr; \
71 __ptr = (unsigned long) (ptr); \
72 (typeof(ptr)) (__ptr + (off)); })
75 #endif /* __KERNEL__ */
77 #endif /* __ASSEMBLY__ */
81 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
82 * warning for each use, in hopes of speeding the functions removal.
84 * int __deprecated foo(void)
87 # define __deprecated /* unimplemented */
91 #define __deprecated_for_modules __deprecated
93 #define __deprecated_for_modules
100 #ifndef CONFIG_ENABLE_MUST_CHECK
104 #ifndef CONFIG_ENABLE_WARN_DEPRECATED
106 #undef __deprecated_for_modules
108 #define __deprecated_for_modules
112 * Allow us to avoid 'defined but not used' warnings on functions and data,
113 * as well as force them to be emitted to the assembly file.
115 * As of gcc 3.4, static functions that are not marked with attribute((used))
116 * may be elided from the assembly file. As of gcc 3.4, static data not so
117 * marked will not be elided, but this may change in a future gcc version.
119 * NOTE: Because distributions shipped with a backported unit-at-a-time
120 * compiler in gcc 3.3, we must define __used to be __attribute__((used))
121 * for gcc >=3.3 instead of 3.4.
123 * In prior versions of gcc, such functions and data would be emitted, but
124 * would be warned about except with attribute((unused)).
126 * Mark functions that are referenced only in inline assembly as __used so
127 * the code is emitted even though it appears to be unreferenced.
130 # define __used /* unimplemented */
133 #ifndef __maybe_unused
134 # define __maybe_unused /* unimplemented */
141 #ifndef __always_inline
142 #define __always_inline inline
145 #endif /* __KERNEL__ */
148 * From the GCC manual:
150 * Many functions do not examine any values except their arguments,
151 * and have no effects except the return value. Basically this is
152 * just slightly more strict class than the `pure' attribute above,
153 * since function is not allowed to read global memory.
155 * Note that a function that has pointer arguments and examines the
156 * data pointed to must _not_ be declared `const'. Likewise, a
157 * function that calls a non-`const' function usually must not be
158 * `const'. It does not make sense for a `const' function to return
161 #ifndef __attribute_const__
162 # define __attribute_const__ /* unimplemented */
166 * Tell gcc if a function is cold. The compiler will assume any path
167 * directly leading to the call is unlikely.
174 /* Simple shorthand for a section definition */
176 # define __section(S) __attribute__ ((__section__(#S)))
179 #endif /* __LINUX_COMPILER_H */