diff --git a/sys/dev/dcons/dcons_os.c b/sys/dev/dcons/dcons_os.c
--- a/sys/dev/dcons/dcons_os.c
+++ b/sys/dev/dcons/dcons_os.c
@@ -331,7 +331,7 @@
 #ifdef __amd64__
 		dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
 #else /* __i386__ */
-		dg.buf = (struct dcons_buf *)((vm_offset_t)PMAP_MAP_LOW +
+		dg.buf = (struct dcons_buf *)(vm_offset_t)(PMAP_MAP_LOW +
 		    addr);
 #endif
 		dg.size = size;
diff --git a/sys/dev/fb/fbd.c b/sys/dev/fb/fbd.c
--- a/sys/dev/fb/fbd.c
+++ b/sys/dev/fb/fbd.c
@@ -210,8 +210,8 @@
 		return (ENOENT);
 
 	LIST_FOREACH(entry, &fb_list_head, fb_list) {
-		printf("FB %s @%p\n", entry->fb_info->fb_name,
-		    (void *)entry->fb_info->fb_pbase);
+		printf("FB %s @%#jx\n", entry->fb_info->fb_name,
+		    (uintmax_t)entry->fb_info->fb_pbase);
 	}
 
 	return (0);
diff --git a/sys/vm/vm_dumpset.h b/sys/vm/vm_dumpset.h
--- a/sys/vm/vm_dumpset.h
+++ b/sys/vm/vm_dumpset.h
@@ -92,7 +92,7 @@
 			    (dump_avail[i] & ~PAGE_MASK));
 		bit -= tot;
 	}
-	return ((vm_paddr_t)NULL);
+	return (0);
 }
 
 #define VM_PAGE_DUMP_FOREACH(bitset, pa)				\
diff --git a/sys/x86/xen/hvm.c b/sys/x86/xen/hvm.c
--- a/sys/x86/xen/hvm.c
+++ b/sys/x86/xen/hvm.c
@@ -197,7 +197,7 @@
 		return (EINVAL);
 
 	wrmsr(regs[1], (init_type == XEN_HVM_INIT_EARLY)
-	    ? ((vm_paddr_t)&hypercall_page - KERNBASE)
+	    ? (vm_paddr_t)((uintptr_t)&hypercall_page - KERNBASE)
 	    : vtophys(&hypercall_page));
 
 	return (0);