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diff --git a/sys/compat/linuxkpi/common/include/linux/seqlock.h b/sys/compat/linuxkpi/common/include/linux/seqlock.h
--- a/sys/compat/linuxkpi/common/include/linux/seqlock.h
+++ b/sys/compat/linuxkpi/common/include/linux/seqlock.h
@@ -31,6 +31,7 @@
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/cdefs.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rwlock.h>
@@ -84,9 +85,24 @@
struct seqcount_mutex: seqc_write_end \
)(&(s)->seqc)
+static inline void
+lkpi_write_seqcount_invalidate(seqc_t *seqcp)
+{
+ atomic_thread_fence_rel();
+ *seqcp += SEQC_MOD * 2;
+}
+#define write_seqcount_invalidate(s) lkpi_write_seqcount_invalidate(&(s)->seqc)
+
#define read_seqcount_begin(s) seqc_read(&(s)->seqc)
#define raw_read_seqcount(s) seqc_read_any(&(s)->seqc)
+static inline seqc_t
+lkpi_seqprop_sequence(const seqc_t *seqcp)
+{
+ return (atomic_load_int(__DECONST(seqc_t *, seqcp)));
+}
+#define seqprop_sequence(s) lkpi_seqprop_sequence(&(s)->seqc)
+
/*
* XXX: Are predicts from inline functions still not honored by clang?
*/

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