D55734.id.diff
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	diff --git a/sys/compat/linuxkpi/common/include/asm/pgtable.h b/sys/compat/linuxkpi/common/include/asm/pgtable.h
	--- a/sys/compat/linuxkpi/common/include/asm/pgtable.h
	+++ b/sys/compat/linuxkpi/common/include/asm/pgtable.h
	@@ -53,6 +53,40 @@
	#define _PAGE_PWT (((pteval_t) 1) << _PAGE_BIT_PWT)
	#define _PAGE_PCD (((pteval_t) 1) << _PAGE_BIT_PCD)
	#define _PAGE_PAT (((pteval_t) 1) << _PAGE_BIT_PAT)
	+
	+/*
	+ * On Linux, the value of `PMD_SHIFT` is hard-coded to 21. This corresponds to
	+ * the FreeBSD `PDRSHIFT` constant.
	+ */
	+#define PMD_SHIFT PDRSHIFT
	+
	+#elif defined(__aarch64__)
	+
	+/*
	+ * On Linux, the value of `PMD_SHIFT` is computed from `CONFIG_PGTABLE_LEVELS`.
	+ * The result corresponds to one of the FreeBSD `L*_SHIFT` constants. Here, we
	+ * take the value 21 computed from `CONFIG_PGTABLE_LEVELS = 4`, the default on
	+ * aarch64, which equals to `L2_SHIFT`.
	+ */
	+#define PMD_SHIFT L2_SHIFT
	+
	+#elif defined(__powerpc__)
	+
	+/*
	+ * On Linux, the value of `PMD_SHIFT` is the addition of `PAGE_SHIFT` and
	+ * `PTE_INDEX_SIZE` (hard-coded to 9). The result corresponds to the FreeBSD
	+ * `L3_PAGE_SIZE_SHIFT` constant.
	+ */
	+#define PMD_SHIFT L3_PAGE_SIZE_SHIFT
	+
	+#elif defined(__riscv)
	+
	+/*
	+ * On Linux, the value of `PMD_SHIFT` is hard-coded to 21. This corresponds to
	+ * the FreeBSD `L2_SHIFT` constant.
	+ */
	+#define PMD_SHIFT L2_SHIFT
	+
	#endif

	#endif /* _LINUXKPI_ASM_PGTABLE_H_ */