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diff --git a/sys/compat/linuxkpi/common/include/linux/seq_buf.h b/sys/compat/linuxkpi/common/include/linux/seq_buf.h
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/seq_buf.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2025-2026 The FreeBSD Foundation
+ * Copyright (c) 2025-2026 Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
+ *
+ * This software was developed by Jean-Sébastien Pédron under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef _LINUXKPI_LINUX_SEQ_BUF_H_
+#define _LINUXKPI_LINUX_SEQ_BUF_H_
+
+#include <linux/bug.h>
+#include <linux/minmax.h>
+#include <linux/seq_file.h>
+#include <linux/types.h>
+
+struct seq_buf {
+ char *buffer;
+ size_t size;
+ size_t len;
+};
+
+#define DECLARE_SEQ_BUF(NAME, SIZE) \
+ struct seq_buf NAME = { \
+ .buffer = (char[SIZE]) { 0 }, \
+ .size = SIZE, \
+ }
+
+static inline void
+seq_buf_clear(struct seq_buf *s)
+{
+ s->len = 0;
+ if (s->size > 0)
+ s->buffer[0] = '\0';
+}
+
+static inline void
+seq_buf_set_overflow(struct seq_buf *s)
+{
+ s->len = s->size + 1;
+}
+
+static inline bool
+seq_buf_has_overflowed(struct seq_buf *s)
+{
+ return (s->len > s->size);
+}
+
+static inline bool
+seq_buf_buffer_left(struct seq_buf *s)
+{
+ if (seq_buf_has_overflowed(s))
+ return (0);
+
+ return (s->size - s->len);
+}
+
+#define seq_buf_init(s, buf, size) linuxkpi_seq_buf_init((s), (buf), (size))
+void linuxkpi_seq_buf_init(struct seq_buf *s, char *buf, unsigned int size);
+
+#define seq_buf_printf(s, f, ...) linuxkpi_seq_buf_printf((s), (f), __VA_ARGS__)
+int linuxkpi_seq_buf_printf(struct seq_buf *s, const char *fmt, ...) \
+ __printflike(2, 3);
+
+#define seq_buf_vprintf(s, f, a) linuxkpi_seq_buf_vprintf((s), (f), (a))
+int linuxkpi_seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
+
+#define seq_buf_str(s) linuxkpi_seq_buf_str((s))
+const char * linuxkpi_seq_buf_str(struct seq_buf *s);
+
+#endif
diff --git a/sys/compat/linuxkpi/common/src/linux_seq_buf.c b/sys/compat/linuxkpi/common/src/linux_seq_buf.c
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/common/src/linux_seq_buf.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2025-2026 The FreeBSD Foundation
+ * Copyright (c) 2025-2026 Jean-Sébastien Pédron <dumbbell@FreeBSD.org>
+ *
+ * This software was developed by Jean-Sébastien Pédron under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <linux/seq_buf.h>
+
+void
+linuxkpi_seq_buf_init(struct seq_buf *s, char *buf, unsigned int size)
+{
+ s->buffer = buf;
+ s->size = size;
+
+ seq_buf_clear(s);
+}
+
+int
+linuxkpi_seq_buf_printf(struct seq_buf *s, const char *fmt, ...)
+{
+ int ret;
+ va_list args;
+
+ va_start(args, fmt);
+ ret = seq_buf_vprintf(s, fmt, args);
+ va_end(args);
+
+ return (ret);
+}
+
+int
+linuxkpi_seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args)
+{
+ int ret;
+
+ if (!seq_buf_has_overflowed(s)) {
+ ret = vsnprintf(s->buffer + s->len, s->size - s->len, fmt, args);
+ if (s->len + ret < s->size) {
+ s->len += ret;
+ return (0);
+ }
+ }
+
+ seq_buf_set_overflow(s);
+ return (-1);
+}
+
+const char *
+linuxkpi_seq_buf_str(struct seq_buf *s)
+{
+ if (s->size == 0)
+ return ("");
+
+ if (seq_buf_buffer_left(s))
+ s->buffer[s->len] = '\0';
+ else
+ s->buffer[s->size - 1] = '\0';
+
+ return (s->buffer);
+}
diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -4700,6 +4700,8 @@
compile-with "${LINUXKPI_C} -I$S/contrib/ck/include"
compat/linuxkpi/common/src/linux_schedule.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
+compat/linuxkpi/common/src/linux_seq_buf.c optional compat_linuxkpi \
+ compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_shmemfs.c optional compat_linuxkpi \
compile-with "${LINUXKPI_C}"
compat/linuxkpi/common/src/linux_shrinker.c optional compat_linuxkpi \
diff --git a/sys/modules/linuxkpi/Makefile b/sys/modules/linuxkpi/Makefile
--- a/sys/modules/linuxkpi/Makefile
+++ b/sys/modules/linuxkpi/Makefile
@@ -24,6 +24,7 @@
linux_radix.c \
linux_rcu.c \
linux_schedule.c \
+ linux_seq_buf.c \
linux_seq_file.c \
linux_shmemfs.c \
linux_shrinker.c \

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