Index: head/sys/compat/linuxkpi/common/src/linux_compat.c
===================================================================
--- head/sys/compat/linuxkpi/common/src/linux_compat.c
+++ head/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -538,7 +538,7 @@
 		struct vm_fault vmf;
 
 		/* fill out VM fault structure */
-		vmf.virtual_address = (void *)((uintptr_t)pidx << PAGE_SHIFT);
+		vmf.virtual_address = (void *)IDX_TO_OFF(pidx);
 		vmf.flags = (fault_type & VM_PROT_WRITE) ? FAULT_FLAG_WRITE : 0;
 		vmf.pgoff = 0;
 		vmf.page = NULL;