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 __iomem __attribute__((noderef, address_space(2)))
12 # define __acquires(x) __attribute__((context(0,1)))
13 # define __releases(x) __attribute__((context(1,0)))
14 # define __acquire(x) __context__(1)
15 # define __release(x) __context__(-1)
16 # define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0)
17 extern void __chk_user_ptr(void __user *);
18 extern void __chk_io_ptr(void __iomem *);
25 # define __chk_user_ptr(x) (void)0
26 # define __chk_io_ptr(x) (void)0
27 # define __builtin_warning(x, y...) (1)
28 # define __acquires(x)
29 # define __releases(x)
30 # define __acquire(x) (void)0
31 # define __release(x) (void)0
32 # define __cond_lock(x) (x)
38 # include <linux/compiler-gcc+.h> /* catch-all for GCC 4, 5, etc. */
40 # include <linux/compiler-gcc3.h>
42 # include <linux/compiler-gcc2.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 /* __ASSEMBLY__ */
77 #endif /* __KERNEL__ */
80 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
81 * warning for each use, in hopes of speeding the functions removal.
83 * int __deprecated foo(void)
86 # define __deprecated /* unimplemented */
94 * Allow us to avoid 'defined but not used' warnings on functions and data,
95 * as well as force them to be emitted to the assembly file.
97 * As of gcc 3.3, static functions that are not marked with attribute((used))
98 * may be elided from the assembly file. As of gcc 3.3, static data not so
99 * marked will not be elided, but this may change in a future gcc version.
101 * In prior versions of gcc, such functions and data would be emitted, but
102 * would be warned about except with attribute((unused)).
104 #ifndef __attribute_used__
105 # define __attribute_used__ /* unimplemented */
109 * From the GCC manual:
111 * Many functions have no effects except the return value and their
112 * return value depends only on the parameters and/or global
113 * variables. Such a function can be subject to common subexpression
114 * elimination and loop optimization just as an arithmetic operator
118 #ifndef __attribute_pure__
119 # define __attribute_pure__ /* unimplemented */
123 * From the GCC manual:
125 * Many functions do not examine any values except their arguments,
126 * and have no effects except the return value. Basically this is
127 * just slightly more strict class than the `pure' attribute above,
128 * since function is not allowed to read global memory.
130 * Note that a function that has pointer arguments and examines the
131 * data pointed to must _not_ be declared `const'. Likewise, a
132 * function that calls a non-`const' function usually must not be
133 * `const'. It does not make sense for a `const' function to return
136 #ifndef __attribute_const__
137 # define __attribute_const__ /* unimplemented */
144 #ifndef __always_inline
145 #define __always_inline inline
148 #endif /* __LINUX_COMPILER_H */