diff --git a/sys/compat/linuxkpi/common/include/linux/overflow.h b/sys/compat/linuxkpi/common/include/linux/overflow.h
index 6f53f0b59384..2d540796cd43 100644
--- a/sys/compat/linuxkpi/common/include/linux/overflow.h
+++ b/sys/compat/linuxkpi/common/include/linux/overflow.h
@@ -1,65 +1,53 @@
 /*-
  * Copyright (c) 2020 The FreeBSD Foundation
  *
  * This software was developed by Emmanuel Vadot under sponsorship
  * from the FreeBSD Foundation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #ifndef __LINUX_OVERFLOW_H__
 #define	__LINUX_OVERFLOW_H__
 
 #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)
 
 static inline size_t
 array_size(size_t x, size_t y)
 {
 	size_t retval;
 
 	if (__builtin_mul_overflow(x, y, &retval))
 		retval = SIZE_MAX;
 	return (retval);
 }
-#else
-#error "Compiler does not support __builtin_mul_overflow"
-#endif
 
 #endif	/* __LINUX_OVERFLOW_H__ */