Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_COMPILER_TYPES_H
3#define __LINUX_COMPILER_TYPES_H
4
5#ifndef __ASSEMBLY__
6
7#ifdef __CHECKER__
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))
23extern void __chk_user_ptr(const volatile void __user *);
24extern 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))
29# else
30# define __user
31# endif
32# define __kernel
33# define __safe
34# define __force
35# define __nocast
36# define __iomem
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)
46# define __percpu
47# define __rcu
48# define __private
49# define ACCESS_PRIVATE(p, member) ((p)->member)
50#endif /* __CHECKER__ */
51
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)
55
56#ifdef __KERNEL__
57
58/* Attributes */
59#include <linux/compiler_attributes.h>
60
61/* Compiler specific macros. */
62#ifdef __clang__
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>
69#else
70#error "Unknown compiler"
71#endif
72
73/*
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
79 * generated.
80 */
81#ifdef CONFIG_HAVE_ARCH_COMPILER_H
82#include <asm/compiler.h>
83#endif
84
85struct ftrace_branch_data {
86 const char *func;
87 const char *file;
88 unsigned line;
89 union {
90 struct {
91 unsigned long correct;
92 unsigned long incorrect;
93 };
94 struct {
95 unsigned long miss;
96 unsigned long hit;
97 };
98 unsigned long miss_hit[2];
99 };
100};
101
102struct ftrace_likely_data {
103 struct ftrace_branch_data data;
104 unsigned long constant;
105};
106
107#ifdef CONFIG_ENABLE_MUST_CHECK
108#define __must_check __attribute__((__warn_unused_result__))
109#else
110#define __must_check
111#endif
112
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)))
117#else
118#define notrace __attribute__((__no_instrument_function__))
119#endif
120
121/*
122 * it doesn't make sense on ARM (currently the only user of __naked)
123 * to trace naked functions because then mcount is called without
124 * stack and frame pointer being set up and there is no chance to
125 * restore the lr register to the value before mcount was called.
126 */
127#define __naked __attribute__((__naked__)) notrace
128
129#define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
130
131/*
132 * Prefer gnu_inline, so that extern inline functions do not emit an
133 * externally visible function. This makes extern inline behave as per gnu89
134 * semantics rather than c99. This prevents multiple symbol definition errors
135 * of extern inline functions at link time.
136 * A lot of inline functions can cause havoc with function tracing.
137 */
138#define inline inline __gnu_inline __inline_maybe_unused notrace
139
140/*
141 * gcc provides both __inline__ and __inline as alternate spellings of
142 * the inline keyword, though the latter is undocumented. New kernel
143 * code should only use the inline spelling, but some existing code
144 * uses __inline__. Since we #define inline above, to ensure
145 * __inline__ has the same semantics, we need this #define.
146 *
147 * However, the spelling __inline is strictly reserved for referring
148 * to the bare keyword.
149 */
150#define __inline__ inline
151
152/*
153 * GCC does not warn about unused static inline functions for -Wunused-function.
154 * Suppress the warning in clang as well by using __maybe_unused, but enable it
155 * for W=1 build. This will allow clang to find unused functions. Remove the
156 * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings.
157 */
158#ifdef KBUILD_EXTRA_WARN1
159#define __inline_maybe_unused
160#else
161#define __inline_maybe_unused __maybe_unused
162#endif
163
164/*
165 * Rather then using noinline to prevent stack consumption, use
166 * noinline_for_stack instead. For documentation reasons.
167 */
168#define noinline_for_stack noinline
169
170#endif /* __KERNEL__ */
171
172#endif /* __ASSEMBLY__ */
173
174/*
175 * The below symbols may be defined for one or more, but not ALL, of the above
176 * compilers. We don't consider that to be an error, so set them to nothing.
177 * For example, some of them are for compiler specific plugins.
178 */
179#ifndef __latent_entropy
180# define __latent_entropy
181#endif
182
183#ifndef __randomize_layout
184# define __randomize_layout __designated_init
185#endif
186
187#ifndef __no_randomize_layout
188# define __no_randomize_layout
189#endif
190
191#ifndef randomized_struct_fields_start
192# define randomized_struct_fields_start
193# define randomized_struct_fields_end
194#endif
195
196#ifndef asm_volatile_goto
197#define asm_volatile_goto(x...) asm goto(x)
198#endif
199
200#ifdef CONFIG_CC_HAS_ASM_INLINE
201#define asm_inline asm __inline
202#else
203#define asm_inline asm
204#endif
205
206#ifndef __no_fgcse
207# define __no_fgcse
208#endif
209
210/* Are two types/vars the same type (ignoring qualifiers)? */
211#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
212
213/* Is this type a native word size -- useful for atomic operations */
214#define __native_word(t) \
215 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
216 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
217
218/* Helpers for emitting diagnostics in pragmas. */
219#ifndef __diag
220#define __diag(string)
221#endif
222
223#ifndef __diag_GCC
224#define __diag_GCC(version, severity, string)
225#endif
226
227#define __diag_push() __diag(push)
228#define __diag_pop() __diag(pop)
229
230#define __diag_ignore(compiler, version, option, comment) \
231 __diag_ ## compiler(version, ignore, option)
232#define __diag_warn(compiler, version, option, comment) \
233 __diag_ ## compiler(version, warn, option)
234#define __diag_error(compiler, version, option, comment) \
235 __diag_ ## compiler(version, error, option)
236
237#endif /* __LINUX_COMPILER_TYPES_H */