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diff --git a/sys/compat/linuxkpi/common/include/linux/mmu_notifier.h b/sys/compat/linuxkpi/common/include/linux/mmu_notifier.h
--- a/sys/compat/linuxkpi/common/include/linux/mmu_notifier.h
+++ b/sys/compat/linuxkpi/common/include/linux/mmu_notifier.h
@@ -1,5 +1,6 @@
/*-
* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
+ * Copyright (c) 2026 The FreeBSD Foundation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -25,9 +26,63 @@
*/
#ifndef _LINUXKPI_LINUX_MMU_NOTIFIER_H_
-#define _LINUXKPI_LINUX_MMU_NOTIFIER_H_
+#define _LINUXKPI_LINUX_MMU_NOTIFIER_H_
+
+/*
+ * XXX: These functions are stubbed out. This is a temporary placeholder
+ * to allow compilation. Note that these functions have no implementation;
+ * using them will result in silent failure, memory corruption, or system
+ * instability.
+*/
+#warning "linux/mmu_notifier.h is currently a stub; expect runtime issues"
+
+
+struct mm_struct;
+struct mmu_notifier;
+
+struct mmu_notifier_ops {
+ void (*release)(struct mmu_notifier *mn, struct mm_struct *mm);
+ struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm);
+ void (*free_notifier)(struct mmu_notifier *mn);
+ void (*invalidate_range_start)(struct mmu_notifier *mn, const void *range);
+ void (*invalidate_range_end)(struct mmu_notifier *mn, const void *range);
+};
struct mmu_notifier {
+ const struct mmu_notifier_ops *ops;
};
+
+static inline int
+mmu_notifier_register(struct mmu_notifier *mn, struct mm_struct *mm)
+{
+ return 0;
+}
+
+static inline void
+mmu_notifier_unregister(struct mmu_notifier *mn, struct mm_struct *mm)
+{
+}
+
+static inline struct mmu_notifier *
+mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
+{
+ if (ops && ops->alloc_notifier)
+ return ops->alloc_notifier(mm);
+
+ return NULL;
+}
+
+static inline void
+mmu_notifier_put(struct mmu_notifier *mn)
+{
+ if (mn && mn->ops && mn->ops->free_notifier)
+ mn->ops->free_notifier(mn);
+}
+
+static inline void
+mmu_notifier_synchronize(void)
+{
+}
+
#endif /* _LINUXKPI_LINUX_MMU_NOTIFIER_H_ */

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