[patch kvmtool] x86, kvmtool: Fix build when KVM_TOOL_TEST_ENABLEis set

[David Rientjes]

Commit ab7db91705e9 ("virtio-net: auto-tune mergeable rx buffer size for 
improved performance") requires CONFIG_AVERAGE to be set, which is 
selected by CONFIG_VIRTIO_NET, otherwise the build fails:

drivers/built-in.o: In function `virtnet_poll':
virtio_net.c:(.text+0x11d51f): undefined reference to `ewma_add'
drivers/built-in.o: In function `virtnet_probe':
virtio_net.c:(.text+0x11e668): undefined reference to `ewma_init'

CONFIG_KVM_TOOL_TEST_ENABLE selects CONFIG_VIRTIO_NET but not 
CONFIG_AVERAGE so the build breaks when enabling it.

Select CONFIG_AVERAGE for CONFIG_KVMTOOL_TEST_ENABLE.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 Also affects tip/master.

 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -615,6 +615,7 @@ config KVMTOOL_TEST_ENABLE
 	select VIRTIO_BLK
 	select VIRTIO_CONSOLE
 	select VIRTIO_NET
+	select AVERAGE
 	select 9P_FS
 	select NET_9P
 	select NET_9P_VIRTIO
--
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