Index: sys/sys/pcpu.h
===================================================================
--- sys/sys/pcpu.h
+++ sys/sys/pcpu.h
@@ -84,8 +84,22 @@
 /* struct _hack is to stop this from being used with the static keyword. */
 #define	DPCPU_DEFINE(t, n)	\
     struct _hack; t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
+#if defined(KLD_MODULE) && defined(__aarch64__)
+/*
+ * On arm64 the compiler will use PC-relative load to find the address of
+ * the DPCPU data. We then use this to find the offset of the data in a
+ * per-CPU region. This works for in the kernel as we can allocate the space
+ * ahead of time, however modules need to allocate a sepatate space and then
+ * use relocations to fix the address of the data. As PC-relative data doesn't
+ * have a relocation there is nothing for the kernel module linker to fix so
+ * data is accessed from the wrong location.
+*/
+#define	DPCPU_DEFINE_STATIC(t, n)	\
+    t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
+#else
 #define	DPCPU_DEFINE_STATIC(t, n)	\
     static t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
+#endif
 
 /*
  * Accessors with a given base.