1 #ifndef __LINUX_COMPILER_H
2 #define __LINUX_COMPILER_H
7 # define __user __attribute__((noderef, address_space(1)))
8 # define __kernel __attribute__((address_space(0)))
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 # define __percpu __attribute__((noderef, address_space(3)))
19 #ifdef CONFIG_SPARSE_RCU_POINTER
20 # define __rcu __attribute__((noderef, address_space(4)))
24 extern void __chk_user_ptr(const volatile void __user
*);
25 extern void __chk_io_ptr(const volatile void __iomem
*);
33 # define __chk_user_ptr(x) (void)0
34 # define __chk_io_ptr(x) (void)0
35 # define __builtin_warning(x, y...) (1)
36 # define __acquires(x)
37 # define __releases(x)
38 # define __acquire(x) (void)0
39 # define __release(x) (void)0
40 # define __cond_lock(x,c) (c)
48 #include <linux/compiler-gcc.h>
51 #define notrace __attribute__((no_instrument_function))
53 /* Intel compiler defines __GNUC__. So we will overwrite implementations
54 * coming from above header files here
56 #ifdef __INTEL_COMPILER
57 # include <linux/compiler-intel.h>
61 * Generic compiler-dependent macros required for kernel
62 * build go below this comment. Actual compiler/compiler version
63 * specific implementations come from the above header files
66 struct ftrace_branch_data
{
72 unsigned long correct
;
73 unsigned long incorrect
;
79 unsigned long miss_hit
[2];
84 * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
85 * to disable branch tracing on a per file basis.
87 #if defined(CONFIG_TRACE_BRANCH_PROFILING) \
88 && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
89 void ftrace_likely_update(struct ftrace_branch_data
*f
, int val
, int expect
);
91 #define likely_notrace(x) __builtin_expect(!!(x), 1)
92 #define unlikely_notrace(x) __builtin_expect(!!(x), 0)
94 #define __branch_check__(x, expect) ({ \
96 static struct ftrace_branch_data \
97 __attribute__((__aligned__(4))) \
98 __attribute__((section("_ftrace_annotated_branch"))) \
104 ______r = likely_notrace(x); \
105 ftrace_likely_update(&______f, ______r, expect); \
110 * Using __builtin_constant_p(x) to ignore cases where the return
111 * value is always the same. This idea is taken from a similar patch
112 * written by Daniel Walker.
115 # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
118 # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
121 #ifdef CONFIG_PROFILE_ALL_BRANCHES
123 * "Define 'is'", Bill Clinton
124 * "Define 'if'", Steven Rostedt
126 #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
127 #define __trace_if(cond) \
128 if (__builtin_constant_p((cond)) ? !!(cond) : \
131 static struct ftrace_branch_data \
132 __attribute__((__aligned__(4))) \
133 __attribute__((section("_ftrace_branch"))) \
139 ______r = !!(cond); \
140 ______f.miss_hit[______r]++; \
143 #endif /* CONFIG_PROFILE_ALL_BRANCHES */
146 # define likely(x) __builtin_expect(!!(x), 1)
147 # define unlikely(x) __builtin_expect(!!(x), 0)
150 /* Optimization barrier */
152 # define barrier() __memory_barrier()
155 /* Unreachable code */
157 # define unreachable() do { } while (1)
161 # define RELOC_HIDE(ptr, off) \
162 ({ unsigned long __ptr; \
163 __ptr = (unsigned long) (ptr); \
164 (typeof(ptr)) (__ptr + (off)); })
167 #endif /* __KERNEL__ */
169 #endif /* __ASSEMBLY__ */
173 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
174 * warning for each use, in hopes of speeding the functions removal.
176 * int __deprecated foo(void)
179 # define __deprecated /* unimplemented */
183 #define __deprecated_for_modules __deprecated
185 #define __deprecated_for_modules
192 #ifndef CONFIG_ENABLE_MUST_CHECK
196 #ifndef CONFIG_ENABLE_WARN_DEPRECATED
198 #undef __deprecated_for_modules
200 #define __deprecated_for_modules
204 * Allow us to avoid 'defined but not used' warnings on functions and data,
205 * as well as force them to be emitted to the assembly file.
207 * As of gcc 3.4, static functions that are not marked with attribute((used))
208 * may be elided from the assembly file. As of gcc 3.4, static data not so
209 * marked will not be elided, but this may change in a future gcc version.
211 * NOTE: Because distributions shipped with a backported unit-at-a-time
212 * compiler in gcc 3.3, we must define __used to be __attribute__((used))
213 * for gcc >=3.3 instead of 3.4.
215 * In prior versions of gcc, such functions and data would be emitted, but
216 * would be warned about except with attribute((unused)).
218 * Mark functions that are referenced only in inline assembly as __used so
219 * the code is emitted even though it appears to be unreferenced.
222 # define __used /* unimplemented */
225 #ifndef __maybe_unused
226 # define __maybe_unused /* unimplemented */
229 #ifndef __always_unused
230 # define __always_unused /* unimplemented */
238 * Rather then using noinline to prevent stack consumption, use
239 * noinline_for_stack instead. For documentaiton reasons.
241 #define noinline_for_stack noinline
243 #ifndef __always_inline
244 #define __always_inline inline
247 #endif /* __KERNEL__ */
250 * From the GCC manual:
252 * Many functions do not examine any values except their arguments,
253 * and have no effects except the return value. Basically this is
254 * just slightly more strict class than the `pure' attribute above,
255 * since function is not allowed to read global memory.
257 * Note that a function that has pointer arguments and examines the
258 * data pointed to must _not_ be declared `const'. Likewise, a
259 * function that calls a non-`const' function usually must not be
260 * `const'. It does not make sense for a `const' function to return
263 #ifndef __attribute_const__
264 # define __attribute_const__ /* unimplemented */
268 * Tell gcc if a function is cold. The compiler will assume any path
269 * directly leading to the call is unlikely.
276 /* Simple shorthand for a section definition */
278 # define __section(S) __attribute__ ((__section__(#S)))
281 /* Are two types/vars the same type (ignoring qualifiers)? */
283 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
286 /* Compile time object size, -1 for unknown */
287 #ifndef __compiletime_object_size
288 # define __compiletime_object_size(obj) -1
290 #ifndef __compiletime_warning
291 # define __compiletime_warning(message)
293 #ifndef __compiletime_error
294 # define __compiletime_error(message)
298 * Prevent the compiler from merging or refetching accesses. The compiler
299 * is also forbidden from reordering successive instances of ACCESS_ONCE(),
300 * but only when the compiler is aware of some particular ordering. One way
301 * to make the compiler aware of ordering is to put the two invocations of
302 * ACCESS_ONCE() in different C statements.
304 * This macro does absolutely -nothing- to prevent the CPU from reordering,
305 * merging, or refetching absolutely anything at any time. Its main intended
306 * use is to mediate communication between process-level code and irq/NMI
307 * handlers, all running on the same CPU.
309 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
311 #endif /* __LINUX_COMPILER_H */
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