Index: sys/compat/linuxkpi/common/include/linux/kmsg_dump.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/kmsg_dump.h
@@ -0,0 +1,65 @@
+/*-
+ * Copyright (c) 2025 The FreeBSD Foundation
+ * Copyright (c) 2025 Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
+ *
+ * This software was developed by Jean-Sébastien Pédron 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.
+ */
+
+
+#ifndef _LINUXKPI_LINUX_KMSG_DUMP_H_
+#define	_LINUXKPI_LINUX_KMSG_DUMP_H_
+
+#include <linux/errno.h>
+#include <linux/list.h>
+
+enum kmsg_dump_reason {
+	KMSG_DUMP_UNDEF,
+	KMSG_DUMP_PANIC,
+	KMSG_DUMP_OOPS,
+	KMSG_DUMP_EMERG,
+	KMSG_DUMP_SHUTDOWN,
+	KMSG_DUMP_MAX
+};
+
+struct kmsg_dumper {
+	struct list_head list;
+	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
+	enum kmsg_dump_reason max_reason;
+	bool registered;
+};
+
+static inline int
+kmsg_dump_register(struct kmsg_dumper *dumper)
+{
+	return (-EINVAL);
+}
+
+static inline int
+kmsg_dump_unregister(struct kmsg_dumper *dumper)
+{
+	return (-EINVAL);
+}
+
+#endif /* defined(_LINUXKPI_LINUX_KMSG_DUMP_H_) */