Add a new config option for all backend drivers. This has two benefits:

 1. All backend drivers can be disabled or modularised via
    one config option.
 2. Backend helper routines that are not specific to any particular driver
    can be disabled or modularised based on this config option. In
    particular this may allow backend drivers plus the service module
    to be upgraded separate from the kernel core as and when the backend
    interfaces change (and they will).

Signed-off-by: Keir Fraser <keir@xensource.com>

9 files changed, 9 insertions, 10 deletions

diff --git a/buildconfigs/linux-defconfig_xen0_ia64 b/buildconfigs/linux-defconfig_xen0_ia64
index 2dbb12644e..b77e462d8d 100644
--- a/buildconfigs/linux-defconfig_xen0_ia64
+++ b/buildconfigs/linux-defconfig_xen0_ia64
@@ -95,6 +95,7 @@ CONFIG_ARCH_XEN=y
 CONFIG_XEN_PRIVILEGED_GUEST=y
 CONFIG_XEN_BLKDEV_GRANT=y
 CONFIG_XEN_BLKDEV_FRONTEND=y
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_BLKDEV_BACKEND=y
 CONFIG_XEN_SYSFS=y
 CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
diff --git a/buildconfigs/linux-defconfig_xen0_x86_32 b/buildconfigs/linux-defconfig_xen0_x86_32
index fe24dacce5..4c040a58ae 100644
--- a/buildconfigs/linux-defconfig_xen0_x86_32
+++ b/buildconfigs/linux-defconfig_xen0_x86_32
@@ -1316,6 +1316,7 @@ CONFIG_XEN_INTERFACE_VERSION=0x00030101
 #
 CONFIG_XEN_PRIVILEGED_GUEST=y
 # CONFIG_XEN_UNPRIVILEGED_GUEST is not set
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_PCIDEV_BACKEND=y
 # CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
 CONFIG_XEN_PCIDEV_BACKEND_PASS=y
diff --git a/buildconfigs/linux-defconfig_xen0_x86_64 b/buildconfigs/linux-defconfig_xen0_x86_64
index 94d81d5ae3..e99e956803 100644
--- a/buildconfigs/linux-defconfig_xen0_x86_64
+++ b/buildconfigs/linux-defconfig_xen0_x86_64
@@ -1246,6 +1246,7 @@ CONFIG_NO_IDLE_HZ=y
 #
 CONFIG_XEN_PRIVILEGED_GUEST=y
 # CONFIG_XEN_UNPRIVILEGED_GUEST is not set
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_PCIDEV_BACKEND=y
 # CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
 CONFIG_XEN_PCIDEV_BACKEND_PASS=y
diff --git a/buildconfigs/linux-defconfig_xenU_ia64 b/buildconfigs/linux-defconfig_xenU_ia64
index da7a4e5b0c..d1d330b8ef 100644
--- a/buildconfigs/linux-defconfig_xenU_ia64
+++ b/buildconfigs/linux-defconfig_xenU_ia64
@@ -92,6 +92,7 @@ CONFIG_ARCH_XEN=y
 CONFIG_XEN_PRIVILEGED_GUEST=y
 CONFIG_XEN_BLKDEV_GRANT=y
 CONFIG_XEN_BLKDEV_FRONTEND=y
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_BLKDEV_BACKEND=y
 CONFIG_XEN_SYSFS=y
 CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
diff --git a/buildconfigs/linux-defconfig_xenU_x86_32 b/buildconfigs/linux-defconfig_xenU_x86_32
index cca500a2e4..950220c079 100644
--- a/buildconfigs/linux-defconfig_xenU_x86_32
+++ b/buildconfigs/linux-defconfig_xenU_x86_32
@@ -859,13 +859,9 @@ CONFIG_NO_IDLE_HZ=y
 #
 # CONFIG_XEN_PRIVILEGED_GUEST is not set
 CONFIG_XEN_UNPRIVILEGED_GUEST=y
-# CONFIG_XEN_PCIDEV_BACKEND is not set
-# CONFIG_XEN_BLKDEV_BACKEND is not set
-# CONFIG_XEN_NETDEV_BACKEND is not set
-# CONFIG_XEN_TPMDEV_BACKEND is not set
+# CONFIG_XEN_BACKEND is not set
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
-# CONFIG_XEN_BLKDEV_TAP is not set
 # CONFIG_XEN_TPMDEV_FRONTEND is not set
 CONFIG_XEN_SCRUB_PAGES=y
 CONFIG_XEN_DISABLE_SERIAL=y
diff --git a/buildconfigs/linux-defconfig_xenU_x86_64 b/buildconfigs/linux-defconfig_xenU_x86_64
index 68893b915e..5b61581ddf 100644
--- a/buildconfigs/linux-defconfig_xenU_x86_64
+++ b/buildconfigs/linux-defconfig_xenU_x86_64
@@ -1135,13 +1135,9 @@ CONFIG_NO_IDLE_HZ=y
 #
 # CONFIG_XEN_PRIVILEGED_GUEST is not set
 CONFIG_XEN_UNPRIVILEGED_GUEST=y
-# CONFIG_XEN_PCIDEV_BACKEND is not set
-# CONFIG_XEN_BLKDEV_BACKEND is not set
-# CONFIG_XEN_NETDEV_BACKEND is not set
-# CONFIG_XEN_TPMDEV_BACKEND is not set
+# CONFIG_XEN_BACKEND is not set
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
-# CONFIG_XEN_BLKDEV_TAP is not set
 # CONFIG_XEN_TPMDEV_FRONTEND is not set
 CONFIG_XEN_SCRUB_PAGES=y
 CONFIG_XEN_DISABLE_SERIAL=y
diff --git a/buildconfigs/linux-defconfig_xen_ia64 b/buildconfigs/linux-defconfig_xen_ia64
index 6592742e37..3c3c6e5206 100644
--- a/buildconfigs/linux-defconfig_xen_ia64
+++ b/buildconfigs/linux-defconfig_xen_ia64
@@ -95,6 +95,7 @@ CONFIG_ARCH_XEN=y
 CONFIG_XEN_PRIVILEGED_GUEST=y
 CONFIG_XEN_BLKDEV_GRANT=y
 CONFIG_XEN_BLKDEV_FRONTEND=y
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_BLKDEV_BACKEND=y
 CONFIG_XEN_SYSFS=y
 CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
diff --git a/buildconfigs/linux-defconfig_xen_x86_32 b/buildconfigs/linux-defconfig_xen_x86_32
index 27a102a80c..b5dfca04c3 100644
--- a/buildconfigs/linux-defconfig_xen_x86_32
+++ b/buildconfigs/linux-defconfig_xen_x86_32
@@ -2979,6 +2979,7 @@ CONFIG_NO_IDLE_HZ=y
 #
 CONFIG_XEN_PRIVILEGED_GUEST=y
 # CONFIG_XEN_UNPRIVILEGED_GUEST is not set
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_PCIDEV_BACKEND=y
 # CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
 CONFIG_XEN_PCIDEV_BACKEND_PASS=y
diff --git a/buildconfigs/linux-defconfig_xen_x86_64 b/buildconfigs/linux-defconfig_xen_x86_64
index 5d95052289..60e1c7dded 100644
--- a/buildconfigs/linux-defconfig_xen_x86_64
+++ b/buildconfigs/linux-defconfig_xen_x86_64
@@ -2656,6 +2656,7 @@ CONFIG_NO_IDLE_HZ=y
 #
 CONFIG_XEN_PRIVILEGED_GUEST=y
 # CONFIG_XEN_UNPRIVILEGED_GUEST is not set
+CONFIG_XEN_BACKEND=y
 CONFIG_XEN_PCIDEV_BACKEND=y
 # CONFIG_XEN_PCIDEV_BACKEND_VPCI is not set
 CONFIG_XEN_PCIDEV_BACKEND_PASS=y