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2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2 
 kernel/include/linux/compiler-gcc.h
....@@ -10,8 +10,9 @@
1010 		     + __GNUC_MINOR__ * 100	\
1111 		     + __GNUC_PATCHLEVEL__)
1212 
13
-#if GCC_VERSION < 40600
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-# error Sorry, your compiler is too old - please upgrade it.
13
+/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */
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+#if GCC_VERSION < 40900
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+# error Sorry, your version of GCC is too old - please use 4.9 or newer.
1516 #elif defined(CONFIG_ARM64) && GCC_VERSION < 50100
1617 /*
1718  * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
....@@ -45,37 +46,17 @@
4546 	(typeof(ptr)) (__ptr + (off));					\
4647 })
4748 
48
-/*
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- * A trick to suppress uninitialized variable warning without generating any
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- * code
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- */
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-#define uninitialized_var(x) x = x
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-
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-#ifdef __CHECKER__
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-#define __must_be_array(a)	0
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-#else
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-/* &a[0] degrades to a pointer: a different type from an array */
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-#define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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-#endif
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-
6149 #ifdef CONFIG_RETPOLINE
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-#define __noretpoline __attribute__((indirect_branch("keep")))
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+#define __noretpoline __attribute__((__indirect_branch__("keep")))
6351 #endif
6452 
6553 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
6654 
67
-#define __optimize(level)	__attribute__((__optimize__(level)))
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-
6955 #define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
7056 
71
-#ifndef __CHECKER__
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-#define __compiletime_warning(message) __attribute__((warning(message)))
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-#define __compiletime_error(message) __attribute__((error(message)))
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-
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-#ifdef LATENT_ENTROPY_PLUGIN
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+#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
7658 #define __latent_entropy __attribute__((latent_entropy))
7759 #endif
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-#endif /* __CHECKER__ */
7960 
8061 /*
8162  * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
....@@ -90,10 +71,6 @@
9071  * Mark a position in code as unreachable.  This can be used to
9172  * suppress control flow warnings after asm blocks that transfer
9273  * control elsewhere.
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- *
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- * Early snapshots of gcc 4.5 don't support this and we can't detect
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- * this in the preprocessor, but we can live with this because they're
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- * unreleased.  Really, we need to have autoconf for the kernel.
9774  */
9875 #define unreachable() \
9976 	do {					\
....@@ -102,41 +79,12 @@
10279 		__builtin_unreachable();	\
10380 	} while (0)
10481 
105
-/* Mark a function definition as prohibited from being cloned. */
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-#define __noclone	__attribute__((__noclone__, __optimize__("no-tracer")))
107
-
10882 #if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
10983 #define __randomize_layout __attribute__((randomize_layout))
11084 #define __no_randomize_layout __attribute__((no_randomize_layout))
11185 /* This anon struct can add padding, so only enable it under randstruct. */
11286 #define randomized_struct_fields_start	struct {
11387 #define randomized_struct_fields_end	} __randomize_layout;
114
-#endif
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-
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-/*
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- * When used with Link Time Optimization, gcc can optimize away C functions or
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- * variables which are referenced only from assembly code.  __visible tells the
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- * optimizer that something else uses this function or variable, thus preventing
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- * this.
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- */
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-#define __visible	__attribute__((externally_visible))
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-
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-/* gcc version specific checks */
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-
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-#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
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-/*
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- * __assume_aligned(n, k): Tell the optimizer that the returned
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- * pointer can be assumed to be k modulo n. The second argument is
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- * optional (default 0), so we use a variadic macro to make the
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- * shorthand.
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- *
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- * Beware: Do not apply this to functions which may return
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- * ERR_PTRs. Also, it is probably unwise to apply it to functions
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- * returning extra information in the low bits (but in that case the
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- * compiler should see some alignment anyway, when the return value is
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- * massaged by 'flags = ptr & 3; ptr &= ~3;').
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- */
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-#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
14088 #endif
14189 
14290 /*
....@@ -157,9 +105,7 @@
157105 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
158106 #define __HAVE_BUILTIN_BSWAP32__
159107 #define __HAVE_BUILTIN_BSWAP64__
160
-#if GCC_VERSION >= 40800
161108 #define __HAVE_BUILTIN_BSWAP16__
162
-#endif
163109 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */
164110 
165111 #if GCC_VERSION >= 70000
....@@ -170,40 +116,32 @@
170116 #define KASAN_ABI_VERSION 3
171117 #endif
172118 
173
-/*
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- * Older GCCs (< 5) don't support __has_attribute, so instead of checking
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- * __has_attribute(__no_sanitize_address__) do a GCC version check.
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- */
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-#ifndef __has_attribute
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-# define __has_attribute(x) __GCC4_has_attribute_##x
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-# define __GCC4_has_attribute___no_sanitize_address__ (__GNUC_MINOR__ >= 8)
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-#endif
181
-
182119 #if __has_attribute(__no_sanitize_address__)
183120 #define __no_sanitize_address __attribute__((no_sanitize_address))
184121 #else
185122 #define __no_sanitize_address
186123 #endif
187124 
125
+#if defined(__SANITIZE_THREAD__) && __has_attribute(__no_sanitize_thread__)
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+#define __no_sanitize_thread __attribute__((no_sanitize_thread))
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+#else
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+#define __no_sanitize_thread
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+#endif
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+
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+#if __has_attribute(__no_sanitize_undefined__)
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+#define __no_sanitize_undefined __attribute__((no_sanitize_undefined))
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+#else
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+#define __no_sanitize_undefined
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+#endif
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+
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+#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
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+#define __no_sanitize_coverage __attribute__((no_sanitize_coverage))
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+#else
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+#define __no_sanitize_coverage
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+#endif
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+
188143 #if GCC_VERSION >= 50100
189
-/*
190
- * Mark structures as requiring designated initializers.
191
- * https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
192
- */
193
-#define __designated_init __attribute__((designated_init))
194144 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
195
-#endif
196
-
197
-#if GCC_VERSION >= 90100
198
-#define __copy(symbol)                 __attribute__((__copy__(symbol)))
199
-#endif
200
-
201
-#if !defined(__noclone)
202
-#define __noclone	/* not needed */
203
-#endif
204
-
205
-#if !defined(__no_sanitize_address)
206
-#define __no_sanitize_address
207145 #endif
208146 
209147 /*