debug lk

hc

2024-02-20 e636c8d336489bf3eed5878299e6cc045bbad077

 kernel/include/linux/compiler-clang.h
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@@ -3,9 +3,17 @@
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 #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead."
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 #endif
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-/* Compiler specific definitions for Clang compiler */
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+#define CLANG_VERSION (__clang_major__ * 10000	\
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+		     + __clang_minor__ * 100	\
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+		     + __clang_patchlevel__)
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-#define uninitialized_var(x) x = *(&(x))
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+#if CLANG_VERSION < 100001
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+#ifndef __BPF_TRACING__
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+# error Sorry, your version of Clang is too old - please use 10.0.1 or newer.
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+#endif
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+#endif
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+
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+/* Compiler specific definitions for Clang compiler */
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 /* same as gcc, this was present in clang-2.6 so we can assume it works
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  * with any version that can compile the kernel
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@@ -15,11 +23,14 @@
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 /* all clang versions usable with the kernel support KASAN ABI version 5 */
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 #define KASAN_ABI_VERSION 5
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-/* __no_sanitize_address has been already defined compiler-gcc.h */
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-#undef __no_sanitize_address
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+/*
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+ * Note: Checking __has_feature(*_sanitizer) is only true if the feature is
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+ * enabled. Therefore it is not required to additionally check defined(CONFIG_*)
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+ * to avoid adding redundant attributes in other configurations.
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+ */
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 #if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
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-/* emulate gcc's __SANITIZE_ADDRESS__ flag */
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+/* Emulate GCC's __SANITIZE_ADDRESS__ flag */
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 #define __SANITIZE_ADDRESS__
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 #define __no_sanitize_address \
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 		__attribute__((no_sanitize("address", "hwaddress")))
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@@ -27,8 +38,42 @@
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 #define __no_sanitize_address
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 #endif
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+#if __has_feature(thread_sanitizer)
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+/* emulate gcc's __SANITIZE_THREAD__ flag */
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+#define __SANITIZE_THREAD__
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+#define __no_sanitize_thread \
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+		__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 defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
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+#define __HAVE_BUILTIN_BSWAP32__
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+#define __HAVE_BUILTIN_BSWAP64__
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+#define __HAVE_BUILTIN_BSWAP16__
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+#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
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+
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+#if __has_feature(undefined_behavior_sanitizer)
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+/* GCC does not have __SANITIZE_UNDEFINED__ */
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+#define __no_sanitize_undefined \
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+		__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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 /*
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- * Not all versions of clang implement the the type-generic versions
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+ * Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
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+ * with no_sanitize("coverage"). Prior versions of Clang support coverage
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+ * instrumentation, but cannot be queried for support by the preprocessor.
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+ */
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+#if __has_feature(coverage_sanitizer)
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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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+
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+/*
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+ * Not all versions of clang implement the type-generic versions
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  * of the builtin overflow checkers. Fortunately, clang implements
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  * __has_builtin allowing us to avoid awkward version
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  * checks. Unfortunately, we don't know which version of gcc clang
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@@ -40,25 +85,9 @@
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 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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 #endif
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-/* The following are for compatibility with GCC, from compiler-gcc.h,
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- * and may be redefined here because they should not be shared with other
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- * compilers, like ICC.
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- */
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-#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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-#define __assume_aligned(a, ...)	\
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-	__attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
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-
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-#ifdef CONFIG_LTO_CLANG
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-#ifdef CONFIG_FTRACE_MCOUNT_RECORD
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-#define __norecordmcount \
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-	__attribute__((__section__(".text..ftrace")))
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-#endif
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-
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-#define __nocfi		__attribute__((no_sanitize("cfi")))
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-#endif
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-
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 #if __has_feature(shadow_call_stack)
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 # define __noscs	__attribute__((__no_sanitize__("shadow-call-stack")))
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-#else
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-# define __noscs
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 #endif
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+
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+#define __nocfi		__attribute__((__no_sanitize__("cfi")))
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+#define __cficanonical	__attribute__((__cfi_canonical_jump_table__))