[Xen-devel] blktap2: Depend on XEN_BLKDEV_BACKEND

[Simon Horman <horms@xxxxxxxxxxxx>]

blktap2 needs blktap_prep_foreign.
This dependency ensures that if XEN_BLKDEV_BACKEND is a module
then blktap2 is too. Otherwise the following build error will occur:

drivers/built-in.o: In function `blktap_prep_foreign':
/home/horms/projects/xen/hg/linux-2.6.18-xen.hg/drivers/xen/blktap2/device.c:448:
undefined reference to `blkback_pagemap_read'
make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

Index: linux-2.6.18-xen.hg/drivers/xen/Kconfig
===================================================================
--- linux-2.6.18-xen.hg.orig/drivers/xen/Kconfig        2010-03-31 
15:45:07.000000000 +0900
+++ linux-2.6.18-xen.hg/drivers/xen/Kconfig     2010-03-31 15:45:12.000000000 
+0900
@@ -65,8 +65,7 @@ config XEN_BLKDEV_TAP
 
 config XEN_BLKDEV_TAP2
        tristate "Block-device tap backend driver 2"
-       depends on XEN_BACKEND
-       default XEN_BACKEND
+       depends on XEN_BACKEND && XEN_BLKDEV_BACKEND
        help
          The block tap driver is an alternative to the block back driver 
           and allows VM block requests to be redirected to userspace through

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