disable kernel build waring

hc

2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b

 kernel/include/linux/build_bug.h
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@@ -5,28 +5,22 @@
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 #include <linux/compiler.h>
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 #ifdef __CHECKER__
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-#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
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-#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
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 #define BUILD_BUG_ON_ZERO(e) (0)
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-#define BUILD_BUG_ON_INVALID(e) (0)
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-#define BUILD_BUG_ON_MSG(cond, msg) (0)
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-#define BUILD_BUG_ON(condition) (0)
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-#define BUILD_BUG() (0)
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 #else /* __CHECKER__ */
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+/*
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+ * Force a compilation error if condition is true, but also produce a
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+ * result (of value 0 and type int), so the expression can be used
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+ * e.g. in a structure initializer (or where-ever else comma expressions
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+ * aren't permitted).
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+ */
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+#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
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+#endif /* __CHECKER__ */
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 /* Force a compilation error if a constant expression is not a power of 2 */
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 #define __BUILD_BUG_ON_NOT_POWER_OF_2(n)	\
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 	BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
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 #define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
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 	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
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-
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-/*
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- * Force a compilation error if condition is true, but also produce a
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- * result (of value 0 and type size_t), so the expression can be used
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- * e.g. in a structure initializer (or where-ever else comma expressions
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- * aren't permitted).
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- */
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-#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
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 /*
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  * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
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@@ -51,23 +45,9 @@
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  * If you have some code which relies on certain constants being equal, or
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  * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
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  * detect if someone changes it.
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- *
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- * The implementation uses gcc's reluctance to create a negative array, but gcc
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- * (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
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- * inline functions).  Luckily, in 4.3 they added the "error" function
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- * attribute just for this type of case.  Thus, we use a negative sized array
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- * (should always create an error on gcc versions older than 4.4) and then call
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- * an undefined function with the error attribute (should always create an
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- * error on gcc 4.3 and later).  If for some reason, neither creates a
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- * compile-time error, we'll still have a link-time error, which is harder to
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- * track down.
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  */
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-#ifndef __OPTIMIZE__
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-#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
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-#else
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 #define BUILD_BUG_ON(condition) \
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 	BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
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-#endif
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 /**
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  * BUILD_BUG - break compile if used.
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@@ -78,7 +58,24 @@
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  */
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 #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
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-#endif	/* __CHECKER__ */
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+/**
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+ * static_assert - check integer constant expression at build time
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+ *
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+ * static_assert() is a wrapper for the C11 _Static_assert, with a
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+ * little macro magic to make the message optional (defaulting to the
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+ * stringification of the tested expression).
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+ *
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+ * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
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+ * scope, but requires the expression to be an integer constant
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+ * expression (i.e., it is not enough that __builtin_constant_p() is
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+ * true for expr).
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+ *
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+ * Also note that BUILD_BUG_ON() fails the build if the condition is
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+ * true, while static_assert() fails the build if the expression is
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+ * false.
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+ */
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+#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
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+#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
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 #ifdef __GENKSYMS__
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 /* genksyms gets confused by _Static_assert */