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diff --git a/share/man/man9/cdefs.9 b/share/man/man9/cdefs.9
--- a/share/man/man9/cdefs.9
+++ b/share/man/man9/cdefs.9
@@ -3,7 +3,7 @@
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
-.Dd May 9, 2025
+.Dd May 6, 2026
.Dt CDEFS 9
.Os
.Sh NAME
@@ -85,7 +85,9 @@
.It Sy __weak_symbol Ta Declare the symbol to be a weak symbol
.It Sy __dead2 Ta Function will not return
.It Sy __pure2 Ta Function has no side effects
-.It Sy __unused Ta To Variable may be unused (usually arguments), so do not
+.It Sy __unused Ta Variable may be unused (usually arguments), so do not
+warn about it
+.It Sy __maybe_unused Ta Variable may be unused (usually arguments), so do not
warn about it
.It Sy __used Ta Function really is used, so emit it even if it appears unused.
.It Sy __deprecated Ta Function interface has been deprecated, and clients
diff --git a/sys/compat/linuxkpi/common/include/linux/compiler_attributes.h b/sys/compat/linuxkpi/common/include/linux/compiler_attributes.h
--- a/sys/compat/linuxkpi/common/include/linux/compiler_attributes.h
+++ b/sys/compat/linuxkpi/common/include/linux/compiler_attributes.h
@@ -39,7 +39,6 @@
#define noinline_for_stack __noinline
-#define __maybe_unused __unused
#define __always_unused __unused
#define __must_check __result_use_check
diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -152,6 +152,7 @@
#define __weak_symbol __attribute__((__weak__))
#define __dead2 __attribute__((__noreturn__))
#define __pure2 __attribute__((__const__))
+#define __maybe_unused __attribute__((__unused__))
#define __unused __attribute__((__unused__))
#define __used __attribute__((__used__))
#define __deprecated __attribute__((__deprecated__))

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