On 5/25/2018 3:34 PM, Stephen Hemminger wrote:

On Thu, 24 May 2018 09:55:14 -0700
Sridhar Samudrala [off-list ref] wrote:

quoted

--- a/drivers/net/hyperv/Kconfig
+++ b/drivers/net/hyperv/Kconfig

@@ -2,5 +2,6 @@ config HYPERV_NET
  	tristate "Microsoft Hyper-V virtual network driver"
  	depends on HYPERV
  	select UCS2_STRING
+	select FAILOVER

When I take a working kernel config, add the patches then do
make oldconfig

It is not autoselecting FAILOVER, it prompts me for it. This means
if user says no then a non-working netvsc device is made.

I see
    Generic failover module (FAILOVER) [M/y/?] (NEW)

So the user is given an option to either build as a Module or part of the
kernel. 'n' is not an option.