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diff --git a/sys/compat/linuxkpi/common/include/linux/kconfig.h b/sys/compat/linuxkpi/common/include/linux/kconfig.h
--- a/sys/compat/linuxkpi/common/include/linux/kconfig.h
+++ b/sys/compat/linuxkpi/common/include/linux/kconfig.h
@@ -73,4 +73,39 @@
#define IS_REACHABLE(_x) (IS_BUILTIN(_x) || \
(IS_MODULE(_x) && IS_BUILTIN(MODULE)))
+/*
+ * On Linux, the CONFIG_PGTABLE_LEVELS value is defined by the config/build
+ * system. Here, we take the per-architecture default value defined in
+ * `arch/$ARCH/Kconfig` files upstream.
+ */
+#if defined(__amd64__)
+
+#define CONFIG_PGTABLE_LEVELS 4
+
+#elif defined(__aarch64__)
+
+#define CONFIG_PGTABLE_LEVELS 4
+
+#elif defined(__i386__)
+
+#define CONFIG_PGTABLE_LEVELS 2
+
+#elif defined(__powerpc__)
+
+#if defined(__powerpc64__)
+#define CONFIG_PGTABLE_LEVELS 4
+#else
+#define CONFIG_PGTABLE_LEVELS 2
+#endif
+
+#elif defined(__riscv)
+
+#if defined(__riscv_xlen) && __riscv_xlen == 64
+#define CONFIG_PGTABLE_LEVELS 5
+#else
+#define CONFIG_PGTABLE_LEVELS 2
+#endif
+
+#endif
+
#endif /* _LINUXKPI_LINUX_KCONFIG_H_ */

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