Index: head/sys/dev/usb/controller/ehci.c
===================================================================
--- head/sys/dev/usb/controller/ehci.c
+++ head/sys/dev/usb/controller/ehci.c
@@ -90,8 +90,7 @@
 #include <dev/usb/controller/ehcireg.h>
 
 #define	EHCI_BUS2SC(bus) \
-   ((ehci_softc_t *)(((uint8_t *)(bus)) - \
-    ((uint8_t *)&(((ehci_softc_t *)0)->sc_bus))))
+	__containerof(bus, ehci_softc_t, sc_bus)
 
 #ifdef USB_DEBUG
 static int ehcidebug = 0;
Index: head/sys/dev/usb/controller/ohci.c
===================================================================
--- head/sys/dev/usb/controller/ohci.c
+++ head/sys/dev/usb/controller/ohci.c
@@ -79,8 +79,7 @@
 #include <dev/usb/controller/ohcireg.h>
 
 #define	OHCI_BUS2SC(bus) \
-   ((ohci_softc_t *)(((uint8_t *)(bus)) - \
-    ((uint8_t *)&(((ohci_softc_t *)0)->sc_bus))))
+	__containerof(bus, ohci_softc_t, sc_bus)
 
 #ifdef USB_DEBUG
 static int ohcidebug = 0;
Index: head/sys/dev/usb/controller/uhci.c
===================================================================
--- head/sys/dev/usb/controller/uhci.c
+++ head/sys/dev/usb/controller/uhci.c
@@ -83,8 +83,7 @@
 
 #define	alt_next next
 #define	UHCI_BUS2SC(bus) \
-   ((uhci_softc_t *)(((uint8_t *)(bus)) - \
-    ((uint8_t *)&(((uhci_softc_t *)0)->sc_bus))))
+	__containerof(bus, uhci_softc_t, sc_bus)
 
 #ifdef USB_DEBUG
 static int uhcidebug = 0;
Index: head/sys/dev/usb/controller/xhci.c
===================================================================
--- head/sys/dev/usb/controller/xhci.c
+++ head/sys/dev/usb/controller/xhci.c
@@ -86,8 +86,7 @@
 #include <dev/usb/controller/xhcireg.h>
 
 #define	XHCI_BUS2SC(bus) \
-   ((struct xhci_softc *)(((uint8_t *)(bus)) - \
-    ((uint8_t *)&(((struct xhci_softc *)0)->sc_bus))))
+	__containerof(bus, struct xhci_softc, sc_bus)
 
 static SYSCTL_NODE(_hw_usb, OID_AUTO, xhci, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "USB XHCI");
Index: head/sys/dev/usb/usb_transfer.h
===================================================================
--- head/sys/dev/usb/usb_transfer.h
+++ head/sys/dev/usb/usb_transfer.h
@@ -153,9 +153,7 @@
 };
 
 #define	USB_DMATAG_TO_XROOT(dpt)				\
-  ((struct usb_xfer_root *)(					\
-   ((uint8_t *)(dpt)) -						\
-   ((uint8_t *)&((struct usb_xfer_root *)0)->dma_parent_tag)))
+	__containerof(dpt, struct usb_xfer_root, dma_parent_tag)
 
 /*
  * The following structure is used to keep information about memory