1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_COMPILER_TYPES_H
3 #define __LINUX_COMPILER_TYPES_H
8 # define __user __attribute__((noderef, address_space(1)))
9 # define __kernel __attribute__((address_space(0)))
10 # define __safe __attribute__((safe))
11 # define __force __attribute__((force))
12 # define __nocast __attribute__((nocast))
13 # define __iomem __attribute__((noderef, address_space(2)))
14 # define __must_hold(x) __attribute__((context(x,1,1)))
15 # define __acquires(x) __attribute__((context(x,0,1)))
16 # define __releases(x) __attribute__((context(x,1,0)))
17 # define __acquire(x) __context__(x,1)
18 # define __release(x) __context__(x,-1)
19 # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
20 # define __percpu __attribute__((noderef, address_space(3)))
21 # define __rcu __attribute__((noderef, address_space(4)))
22 # define __private __attribute__((noderef))
23 extern void __chk_user_ptr(const volatile void __user *);
24 extern void __chk_io_ptr(const volatile void __iomem *);
25 # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
26 #else /* __CHECKER__ */
27 # ifdef STRUCTLEAK_PLUGIN
28 # define __user __attribute__((user))
37 # define __chk_user_ptr(x) (void)0
38 # define __chk_io_ptr(x) (void)0
39 # define __builtin_warning(x, y...) (1)
40 # define __must_hold(x)
41 # define __acquires(x)
42 # define __releases(x)
43 # define __acquire(x) (void)0
44 # define __release(x) (void)0
45 # define __cond_lock(x,c) (c)
49 # define ACCESS_PRIVATE(p, member) ((p)->member)
50 #endif /* __CHECKER__ */
52 /* Indirect macros required for expanded argument pasting, eg. __LINE__. */
53 #define ___PASTE(a,b) a##b
54 #define __PASTE(a,b) ___PASTE(a,b)
59 #include <linux/compiler_attributes.h>
61 /* Compiler specific macros. */
63 #include <linux/compiler-clang.h>
64 #elif defined(__INTEL_COMPILER)
65 #include <linux/compiler-intel.h>
66 #elif defined(__GNUC__)
67 /* The above compilers also define __GNUC__, so order is important here. */
68 #include <linux/compiler-gcc.h>
70 #error "Unknown compiler"
74 * Some architectures need to provide custom definitions of macros provided
75 * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that
76 * conditionally rather than using an asm-generic wrapper in order to avoid
77 * build failures if any C compilation, which will include this file via an
78 * -include argument in c_flags, occurs prior to the asm-generic wrappers being
81 #ifdef CONFIG_HAVE_ARCH_COMPILER_H
82 #include <asm/compiler.h>
85 struct ftrace_branch_data {
91 unsigned long correct;
92 unsigned long incorrect;
98 unsigned long miss_hit[2];
102 struct ftrace_likely_data {
103 struct ftrace_branch_data data;
104 unsigned long constant;
107 #ifdef CONFIG_ENABLE_MUST_CHECK
108 #define __must_check __attribute__((__warn_unused_result__))
113 #if defined(CC_USING_HOTPATCH)
114 #define notrace __attribute__((hotpatch(0, 0)))
115 #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY)
116 #define notrace __attribute__((patchable_function_entry(0, 0)))
118 #define notrace __attribute__((__no_instrument_function__))
121 /* Section for code which can't be instrumented at all */
123 noinline notrace __attribute((__section__(".noinstr.text")))
126 * it doesn't make sense on ARM (currently the only user of __naked)
127 * to trace naked functions because then mcount is called without
128 * stack and frame pointer being set up and there is no chance to
129 * restore the lr register to the value before mcount was called.
131 #define __naked __attribute__((__naked__)) notrace
133 #define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
136 * Prefer gnu_inline, so that extern inline functions do not emit an
137 * externally visible function. This makes extern inline behave as per gnu89
138 * semantics rather than c99. This prevents multiple symbol definition errors
139 * of extern inline functions at link time.
140 * A lot of inline functions can cause havoc with function tracing.
142 #define inline inline __gnu_inline __inline_maybe_unused notrace
145 * gcc provides both __inline__ and __inline as alternate spellings of
146 * the inline keyword, though the latter is undocumented. New kernel
147 * code should only use the inline spelling, but some existing code
148 * uses __inline__. Since we #define inline above, to ensure
149 * __inline__ has the same semantics, we need this #define.
151 * However, the spelling __inline is strictly reserved for referring
152 * to the bare keyword.
154 #define __inline__ inline
157 * GCC does not warn about unused static inline functions for -Wunused-function.
158 * Suppress the warning in clang as well by using __maybe_unused, but enable it
159 * for W=1 build. This will allow clang to find unused functions. Remove the
160 * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings.
162 #ifdef KBUILD_EXTRA_WARN1
163 #define __inline_maybe_unused
165 #define __inline_maybe_unused __maybe_unused
169 * Rather then using noinline to prevent stack consumption, use
170 * noinline_for_stack instead. For documentation reasons.
172 #define noinline_for_stack noinline
174 #endif /* __KERNEL__ */
176 #endif /* __ASSEMBLY__ */
179 * The below symbols may be defined for one or more, but not ALL, of the above
180 * compilers. We don't consider that to be an error, so set them to nothing.
181 * For example, some of them are for compiler specific plugins.
183 #ifndef __latent_entropy
184 # define __latent_entropy
187 #ifndef __randomize_layout
188 # define __randomize_layout __designated_init
191 #ifndef __no_randomize_layout
192 # define __no_randomize_layout
195 #ifndef randomized_struct_fields_start
196 # define randomized_struct_fields_start
197 # define randomized_struct_fields_end
204 #ifndef asm_volatile_goto
205 #define asm_volatile_goto(x...) asm goto(x)
208 #ifdef CONFIG_CC_HAS_ASM_INLINE
209 #define asm_inline asm __inline
211 #define asm_inline asm
218 /* Are two types/vars the same type (ignoring qualifiers)? */
219 #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
222 * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
223 * non-scalar types unchanged.
225 #if (defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900) || defined(__CHECKER__)
227 * We build this out of a couple of helper macros in a vain attempt to
228 * help you keep your lunch down while reading it.
230 #define __pick_scalar_type(x, type, otherwise) \
231 __builtin_choose_expr(__same_type(x, type), (type)0, otherwise)
234 * 'char' is not type-compatible with either 'signed char' or 'unsigned char',
235 * so we include the naked type here as well as the signed/unsigned variants.
237 #define __pick_integer_type(x, type, otherwise) \
238 __pick_scalar_type(x, type, \
239 __pick_scalar_type(x, unsigned type, \
240 __pick_scalar_type(x, signed type, otherwise)))
242 #define __unqual_scalar_typeof(x) typeof( \
243 __pick_integer_type(x, char, \
244 __pick_integer_type(x, short, \
245 __pick_integer_type(x, int, \
246 __pick_integer_type(x, long, \
247 __pick_integer_type(x, long long, x))))))
250 * If supported, prefer C11 _Generic for better compile-times. As above, 'char'
251 * is not type-compatible with 'signed char', and we define a separate case.
253 #define __scalar_type_to_expr_cases(type) \
254 unsigned type: (unsigned type)0, \
255 signed type: (signed type)0
257 #define __unqual_scalar_typeof(x) typeof( \
260 __scalar_type_to_expr_cases(char), \
261 __scalar_type_to_expr_cases(short), \
262 __scalar_type_to_expr_cases(int), \
263 __scalar_type_to_expr_cases(long), \
264 __scalar_type_to_expr_cases(long long), \
268 /* Is this type a native word size -- useful for atomic operations */
269 #define __native_word(t) \
270 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
271 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
273 /* Helpers for emitting diagnostics in pragmas. */
275 #define __diag(string)
279 #define __diag_GCC(version, severity, string)
282 #define __diag_push() __diag(push)
283 #define __diag_pop() __diag(pop)
285 #define __diag_ignore(compiler, version, option, comment) \
286 __diag_ ## compiler(version, ignore, option)
287 #define __diag_warn(compiler, version, option, comment) \
288 __diag_ ## compiler(version, warn, option)
289 #define __diag_error(compiler, version, option, comment) \
290 __diag_ ## compiler(version, error, option)
292 #endif /* __LINUX_COMPILER_TYPES_H */