netdev - Re: [PATCH net-next v12 2/5] netvsc: refactor notifier/event handling code to use the failover framework

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Date:   Sat, 26 May 2018 09:51:56 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>, mst@...hat.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, jesse.brandeburg@...el.com,
        alexander.h.duyck@...el.com, kubakici@...pl, jasowang@...hat.com,
        loseweigh@...il.com, aaron.f.brown@...el.com,
        anjali.singhai@...el.com
Subject: Re: [PATCH net-next v12 2/5] netvsc: refactor notifier/event
 handling code to use the failover framework

Sat, May 26, 2018 at 09:22:18AM CEST, sridhar.samudrala@...el.com wrote:
>On 5/25/2018 4:28 PM, Stephen Hemminger wrote:
>> On Fri, 25 May 2018 16:11:47 -0700
>> "Samudrala, Sridhar" <sridhar.samudrala@...el.com> wrote:
>> 
>> > On 5/25/2018 3:34 PM, Stephen Hemminger wrote:
>> > > On Thu, 24 May 2018 09:55:14 -0700
>> > > Sridhar Samudrala <sridhar.samudrala@...el.com> wrote:
>> > > > --- 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.
>> With most libraries there is no prompt at all.
>
>Not sure what you meant by this.
>Without any patches applied, i had a .config file with HYPERV_NET configured
>as a module.
>Then after applying the first 2 patches in this series, i did a
>  make oldconfig
>and i see the above prompt.
>
>Are you saying that on some distros, 'make oldconfig creates a .config
>file without any prompt and FAILOVER is not getting selected even when HYPERV_NET
>is enabled?
>
>

Well the thing is that for a user, it makes no sense to select
"FAILOVER" by hand. It is a lib, so it should be only select it by a
user. It has no sense to have it turned on by hand - no lib user.
You can achieve that by simply removing "help" for the Kconfig
item. Same thing for "NET_FAILOVER".