Merge branch 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/ke…

…rnel/git/konrad/xen

* 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/xenbus: making backend support modular is too complex
  xen/pci: Make xen-pcifront be dependent on XEN_XENBUS_FRONTEND
  xen/xenbus: fixup checkpatch issues in xenbus_probe*
  xen/netfront: select XEN_XENBUS_FRONTEND
  xen/xenbus: clean up noise in xenbus_probe_frontend.c
  xen/xenbus: clean up noise in xenbus_probe_backend.c
  xen/xenbus: clean up noise in xenbus_probe.c
  xen/xenbus: cleanup debug noise in xenbus_comms.c
  xen/xenbus: clean up error handling
  xen/xenbus: make frontend bus GPL
  xen/xenbus: make sure backend bus is registered earlier
  xenbus/frontend: register bus earlier
  xen: remove xen/evtchn.h
  xen: add backend driver support
  xen: separate out frontend xenbus

drivers/block/Kconfig

@@ -464,6 +464,7 @@ config XEN_BLKDEV_FRONTEND
 	tristate "Xen virtual block device support"
 	depends on XEN
 	default y
+	select XEN_XENBUS_FRONTEND
 	help
 	  This driver implements the front-end of the Xen virtual
 	  block device driver.  It communicates with a back-end driver

drivers/net/Kconfig

@@ -2963,6 +2963,7 @@ config TILE_NET
 config XEN_NETDEV_FRONTEND
 	tristate "Xen network device frontend driver"
 	depends on XEN
+	select XEN_XENBUS_FRONTEND
 	default y
 	help
 	  The network device frontend driver allows the kernel to

drivers/pci/Kconfig

@@ -45,6 +45,7 @@ config XEN_PCIDEV_FRONTEND
         depends on PCI && X86 && XEN
         select HOTPLUG
         select PCI_XEN
+	select XEN_XENBUS_FRONTEND
         default y
         help
           The PCI device frontend driver allows the kernel to import arbitrary

drivers/xen/Kconfig

@@ -29,6 +29,14 @@ config XEN_DEV_EVTCHN
 	  firing.
 	  If in doubt, say yes.
 
+config XEN_BACKEND
+	bool "Backend driver support"
+	depends on XEN_DOM0
+	default y
+	help
+	  Support for backend device drivers that provide I/O services
+	  to other virtual machines.
+
 config XENFS
 	tristate "Xen filesystem"
 	default y
@@ -62,6 +70,9 @@ config XEN_SYS_HYPERVISOR
 	 virtual environment, /sys/hypervisor will still be present,
 	 but will have no xen contents.
 
+config XEN_XENBUS_FRONTEND
+       tristate
+
 config XEN_PLATFORM_PCI
 	tristate "xen platform pci device driver"
 	depends on XEN_PVHVM

drivers/xen/xenbus/Makefile

@@ -5,3 +5,8 @@ xenbus-objs += xenbus_client.o
 xenbus-objs += xenbus_comms.o
 xenbus-objs += xenbus_xs.o
 xenbus-objs += xenbus_probe.o
+
+xenbus-be-objs-$(CONFIG_XEN_BACKEND) += xenbus_probe_backend.o
+xenbus-objs += $(xenbus-be-objs-y)
+
+obj-$(CONFIG_XEN_XENBUS_FRONTEND) += xenbus_probe_frontend.o