#ifdef __KERNEL__
-#ifdef __GNUC__
-#include <linux/compiler-gcc.h>
-#endif
-
-#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
-#define notrace __attribute__((hotpatch(0,0)))
-#else
-#define notrace __attribute__((no_instrument_function))
-#endif
-
-/* Intel compiler defines __GNUC__. So we will overwrite implementations
- * coming from above header files here
- */
-#ifdef __INTEL_COMPILER
-# include <linux/compiler-intel.h>
-#endif
-
-/* Clang compiler defines __GNUC__. So we will overwrite implementations
- * coming from above header files here
- */
+/* Compiler specific macros. */
#ifdef __clang__
#include <linux/compiler-clang.h>
+#elif defined(__INTEL_COMPILER)
+#include <linux/compiler-intel.h>
+#elif defined(__GNUC__)
+/* The above compilers also define __GNUC__, so order is important here. */
+#include <linux/compiler-gcc.h>
+#else
+#error "Unknown compiler"
#endif
/*
#endif
/*
- * Generic compiler-dependent macros required for kernel
+ * Generic compiler-independent macros required for kernel
* build go below this comment. Actual compiler/compiler version
* specific implementations come from the above header files
*/
unsigned long constant;
};
+/* Don't. Just don't. */
+#define __deprecated
+#define __deprecated_for_modules
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
-#ifdef __KERNEL__
/*
- * Allow us to mark functions as 'deprecated' and have gcc emit a nice
- * warning for each use, in hopes of speeding the functions removal.
- * Usage is:
- * int __deprecated foo(void)
+ * The below symbols may be defined for one or more, but not ALL, of the above
+ * compilers. We don't consider that to be an error, so set them to nothing.
+ * For example, some of them are for compiler specific plugins.
*/
-#ifndef __deprecated
-# define __deprecated /* unimplemented */
-#endif
-
-#ifdef MODULE
-#define __deprecated_for_modules __deprecated
-#else
-#define __deprecated_for_modules
-#endif
-
-#ifndef __must_check
-#define __must_check
-#endif
-
-#ifndef CONFIG_ENABLE_MUST_CHECK
-#undef __must_check
-#define __must_check
-#endif
-#ifndef CONFIG_ENABLE_WARN_DEPRECATED
-#undef __deprecated
-#undef __deprecated_for_modules
-#define __deprecated
-#define __deprecated_for_modules
+#ifndef __designated_init
+# define __designated_init
#endif
-#ifndef __malloc
-#define __malloc
+#ifndef __latent_entropy
+# define __latent_entropy
#endif
-/*
- * Allow us to avoid 'defined but not used' warnings on functions and data,
- * as well as force them to be emitted to the assembly file.
- *
- * As of gcc 3.4, static functions that are not marked with attribute((used))
- * may be elided from the assembly file. As of gcc 3.4, static data not so
- * marked will not be elided, but this may change in a future gcc version.
- *
- * NOTE: Because distributions shipped with a backported unit-at-a-time
- * compiler in gcc 3.3, we must define __used to be __attribute__((used))
- * for gcc >=3.3 instead of 3.4.
- *
- * In prior versions of gcc, such functions and data would be emitted, but
- * would be warned about except with attribute((unused)).
- *
- * Mark functions that are referenced only in inline assembly as __used so
- * the code is emitted even though it appears to be unreferenced.
- */
-#ifndef __used
-# define __used /* unimplemented */
+#ifndef __randomize_layout
+# define __randomize_layout __designated_init
#endif
-#ifndef __maybe_unused
-# define __maybe_unused /* unimplemented */
+#ifndef __no_randomize_layout
+# define __no_randomize_layout
#endif
-#ifndef __always_unused
-# define __always_unused /* unimplemented */
+#ifndef randomized_struct_fields_start
+# define randomized_struct_fields_start
+# define randomized_struct_fields_end
#endif
-#ifndef noinline
-#define noinline
+#ifndef __visible
+#define __visible
#endif
/*
- * Rather then using noinline to prevent stack consumption, use
- * noinline_for_stack instead. For documentation reasons.
+ * Assume alignment of return value.
*/
-#define noinline_for_stack noinline
-
-#ifndef __always_inline
-#define __always_inline inline
+#ifndef __assume_aligned
+#define __assume_aligned(a, ...)
#endif
-#endif /* __KERNEL__ */
+/* Are two types/vars the same type (ignoring qualifiers)? */
+#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+
+/* Is this type a native word size -- useful for atomic operations */
+#define __native_word(t) \
+ (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
+ sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
-/*
- * From the GCC manual:
- *
- * Many functions do not examine any values except their arguments,
- * and have no effects except the return value. Basically this is
- * just slightly more strict class than the `pure' attribute above,
- * since function is not allowed to read global memory.
- *
- * Note that a function that has pointer arguments and examines the
- * data pointed to must _not_ be declared `const'. Likewise, a
- * function that calls a non-`const' function usually must not be
- * `const'. It does not make sense for a `const' function to return
- * `void'.
- */
#ifndef __attribute_const__
-# define __attribute_const__ /* unimplemented */
+#define __attribute_const__ __attribute__((__const__))
#endif
-#ifndef __designated_init
-# define __designated_init
+#ifndef __noclone
+#define __noclone
#endif
-#ifndef __latent_entropy
-# define __latent_entropy
+/* Helpers for emitting diagnostics in pragmas. */
+#ifndef __diag
+#define __diag(string)
#endif
-#ifndef __randomize_layout
-# define __randomize_layout __designated_init
+#ifndef __diag_GCC
+#define __diag_GCC(version, severity, string)
#endif
-#ifndef __no_randomize_layout
-# define __no_randomize_layout
-#endif
+#define __diag_push() __diag(push)
+#define __diag_pop() __diag(pop)
-#ifndef randomized_struct_fields_start
-# define randomized_struct_fields_start
-# define randomized_struct_fields_end
-#endif
+#define __diag_ignore(compiler, version, option, comment) \
+ __diag_ ## compiler(version, ignore, option)
+#define __diag_warn(compiler, version, option, comment) \
+ __diag_ ## compiler(version, warn, option)
+#define __diag_error(compiler, version, option, comment) \
+ __diag_ ## compiler(version, error, option)
/*
- * Tell gcc if a function is cold. The compiler will assume any path
- * directly leading to the call is unlikely.
+ * From the GCC manual:
+ *
+ * Many functions have no effects except the return value and their
+ * return value depends only on the parameters and/or global
+ * variables. Such a function can be subject to common subexpression
+ * elimination and loop optimization just as an arithmetic operator
+ * would be.
+ * [...]
*/
-
-#ifndef __cold
-#define __cold
+#define __pure __attribute__((pure))
+#define __aligned(x) __attribute__((aligned(x)))
+#define __aligned_largest __attribute__((aligned))
+#define __printf(a, b) __attribute__((format(printf, a, b)))
+#define __scanf(a, b) __attribute__((format(scanf, a, b)))
+#define __maybe_unused __attribute__((unused))
+#define __always_unused __attribute__((unused))
+#define __mode(x) __attribute__((mode(x)))
+#define __malloc __attribute__((__malloc__))
+#define __used __attribute__((__used__))
+#define __noreturn __attribute__((noreturn))
+#define __packed __attribute__((packed))
+#define __weak __attribute__((weak))
+#define __alias(symbol) __attribute__((alias(#symbol)))
+#define __cold __attribute__((cold))
+#define __section(S) __attribute__((__section__(#S)))
+
+
+#ifdef CONFIG_ENABLE_MUST_CHECK
+#define __must_check __attribute__((warn_unused_result))
+#else
+#define __must_check
#endif
-/* Simple shorthand for a section definition */
-#ifndef __section
-# define __section(S) __attribute__ ((__section__(#S)))
+#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
+#define notrace __attribute__((hotpatch(0, 0)))
+#else
+#define notrace __attribute__((no_instrument_function))
#endif
-#ifndef __visible
-#define __visible
-#endif
+#define __compiler_offsetof(a, b) __builtin_offsetof(a, b)
-#ifndef __nostackprotector
-# define __nostackprotector
+/*
+ * Feature detection for gnu_inline (gnu89 extern inline semantics). Either
+ * __GNUC_STDC_INLINE__ is defined (not using gnu89 extern inline semantics,
+ * and we opt in to the gnu89 semantics), or __GNUC_STDC_INLINE__ is not
+ * defined so the gnu89 semantics are the default.
+ */
+#ifdef __GNUC_STDC_INLINE__
+# define __gnu_inline __attribute__((gnu_inline))
+#else
+# define __gnu_inline
#endif
/*
- * Assume alignment of return value.
+ * Force always-inline if the user requests it so via the .config.
+ * GCC does not warn about unused static inline functions for
+ * -Wunused-function. This turns out to avoid the need for complex #ifdef
+ * directives. Suppress the warning in clang as well by using "unused"
+ * function attribute, which is redundant but not harmful for gcc.
+ * Prefer gnu_inline, so that extern inline functions do not emit an
+ * externally visible function. This makes extern inline behave as per gnu89
+ * semantics rather than c99. This prevents multiple symbol definition errors
+ * of extern inline functions at link time.
+ * A lot of inline functions can cause havoc with function tracing.
*/
-#ifndef __assume_aligned
-#define __assume_aligned(a, ...)
+#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
+ !defined(CONFIG_OPTIMIZE_INLINING)
+#define inline \
+ inline __attribute__((always_inline, unused)) notrace __gnu_inline
+#else
+#define inline inline __attribute__((unused)) notrace __gnu_inline
#endif
+#define __inline__ inline
+#define __inline inline
+#define noinline __attribute__((noinline))
-/* Are two types/vars the same type (ignoring qualifiers)? */
-#ifndef __same_type
-# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
+#ifndef __always_inline
+#define __always_inline inline __attribute__((always_inline))
#endif
-/* Is this type a native word size -- useful for atomic operations */
-#ifndef __native_word
-# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
-#endif
+/*
+ * Rather then using noinline to prevent stack consumption, use
+ * noinline_for_stack instead. For documentation reasons.
+ */
+#define noinline_for_stack noinline
#endif /* __LINUX_COMPILER_TYPES_H */
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