D31942.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/overflow.h b/sys/compat/linuxkpi/common/include/linux/overflow.h
	--- a/sys/compat/linuxkpi/common/include/linux/overflow.h
	+++ b/sys/compat/linuxkpi/common/include/linux/overflow.h
	@@ -34,18 +34,9 @@
	#include <sys/stdint.h>
	#include <sys/types.h>

	-#ifndef __has_builtin
	-#define __has_builtin(x) 0
	-#endif
	-
	-#if __has_builtin(__builtin_add_overflow)
	#define check_add_overflow(a, b, c) \
	__builtin_add_overflow(a, b, c)
	-#else
	-#error "Compiler does not support __builtin_add_overflow"
	-#endif

	-#if __has_builtin(__builtin_mul_overflow)
	#define check_mul_overflow(a, b, c) \
	__builtin_mul_overflow(a, b, c)

	@@ -58,8 +49,5 @@
	retval = SIZE_MAX;
	return (retval);
	}
	-#else
	-#error "Compiler does not support __builtin_mul_overflow"
	-#endif

	#endif /* __LINUX_OVERFLOW_H__ */