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(void __user
*);
19 extern void __chk_io_ptr(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 #error no compiler-gcc.h file for this gcc version
42 # include <linux/compiler-gcc4.h>
44 # include <linux/compiler-gcc3.h>
46 # error Sorry, your compiler is too old/not recognized.
49 /* Intel compiler defines __GNUC__. So we will overwrite implementations
50 * coming from above header files here
52 #ifdef __INTEL_COMPILER
53 # include <linux/compiler-intel.h>
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
62 #define likely(x) __builtin_expect(!!(x), 1)
63 #define unlikely(x) __builtin_expect(!!(x), 0)
65 /* Optimization barrier */
67 # define barrier() __memory_barrier()
71 # define RELOC_HIDE(ptr, off) \
72 ({ unsigned long __ptr; \
73 __ptr = (unsigned long) (ptr); \
74 (typeof(ptr)) (__ptr + (off)); })
77 #endif /* __KERNEL__ */
79 #endif /* __ASSEMBLY__ */
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.
86 * int __deprecated foo(void)
89 # define __deprecated /* unimplemented */
93 #define __deprecated_for_modules __deprecated
95 #define __deprecated_for_modules
102 #ifndef CONFIG_ENABLE_MUST_CHECK
108 * Allow us to avoid 'defined but not used' warnings on functions and data,
109 * as well as force them to be emitted to the assembly file.
111 * As of gcc 3.3, static functions that are not marked with attribute((used))
112 * may be elided from the assembly file. As of gcc 3.3, static data not so
113 * marked will not be elided, but this may change in a future gcc version.
115 * In prior versions of gcc, such functions and data would be emitted, but
116 * would be warned about except with attribute((unused)).
118 #ifndef __attribute_used__
119 # define __attribute_used__ /* unimplemented */
123 * From the GCC manual:
125 * Many functions have no effects except the return value and their
126 * return value depends only on the parameters and/or global
127 * variables. Such a function can be subject to common subexpression
128 * elimination and loop optimization just as an arithmetic operator
132 #ifndef __attribute_pure__
133 # define __attribute_pure__ /* unimplemented */
140 #ifndef __always_inline
141 #define __always_inline inline
144 #endif /* __KERNEL__ */
147 * From the GCC manual:
149 * Many functions do not examine any values except their arguments,
150 * and have no effects except the return value. Basically this is
151 * just slightly more strict class than the `pure' attribute above,
152 * since function is not allowed to read global memory.
154 * Note that a function that has pointer arguments and examines the
155 * data pointed to must _not_ be declared `const'. Likewise, a
156 * function that calls a non-`const' function usually must not be
157 * `const'. It does not make sense for a `const' function to return
160 #ifndef __attribute_const__
161 # define __attribute_const__ /* unimplemented */
164 #endif /* __LINUX_COMPILER_H */
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