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diff --git a/sys/compat/linuxkpi/common/include/linux/bitfield.h b/sys/compat/linuxkpi/common/include/linux/bitfield.h
--- a/sys/compat/linuxkpi/common/include/linux/bitfield.h
+++ b/sys/compat/linuxkpi/common/include/linux/bitfield.h
@@ -2,6 +2,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020-2024 The FreeBSD Foundation
+ * Copyright (c) 2026 Bjoern A. Zeeb
*
* This software was developed by Björn Zeeb under sponsorship from
* the FreeBSD Foundation.
@@ -138,4 +139,40 @@
#define FIELD_GET(_mask, _value) \
((typeof(_mask))(((_value) & (_mask)) >> __bf_shf(_mask)))
+/* We do not run checks on this one (yet) so it equals FIELD_GET(). */
+#define __FIELD_GET(_mask, _value, _x) \
+ ((typeof(_mask))(((_value) & (_mask)) >> __bf_shf(_mask)))
+
+#define FIELD_GET_SIGNED(_mask, _value) \
+ ((typeof(_Generic((_mask), \
+ signed long long: (signed long long)0, \
+ unsigned long long: (signed long long)0, \
+ signed long: (signed long)0, \
+ unsigned long: (signed long)0, \
+ signed int: (signed int)0, \
+ unsigned int: (signed int)0, \
+ signed short: (signed short)0, \
+ unsigned short: (signed short)0, \
+ signed char: (signed char)0, \
+ unsigned char: (signed char)0, \
+ char: (signed char)0, \
+ default: (_mask)))) \
+ (((long long)(_value) << __builtin_clzll(_mask)) >> \
+ (__builtin_clzll(_mask) + __builtin_ctzll(_mask))))
+
+#define __field_get(_mask, _value) \
+ ({ \
+ typeof(_mask) __mask = _mask; \
+ typeof(__mask) __value = _value; \
+ unsigned int __shift; \
+ \
+ __shift = BITS_PER_TYPE(__mask) > 32 ? __ffs64(__mask) :\
+ __ffs(__mask); \
+ (__value & __mask) >> __shift; \
+ })
+
+#define field_get(_mask, _value) \
+ (__builtin_constant_p(_mask) ? __FIELD_GET(_mask, _value, "") : \
+ __field_get(_mask, _value))
+
#endif /* _LINUXKPI_LINUX_BITFIELD_H */

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