linux-kernel - Re: [PATCH] hyperv: make HYPERV a menuconfig to ease disabling it all

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Message-ID: <b8d654d1-67c9-b6bc-7aad-e5c7a4beec48@infradead.org>
Date:   Thu, 14 Dec 2017 09:43:48 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Greg KH <greg@...ah.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Cc:     Vincent Legoll <vincent.legoll@...il.com>,
        devel@...uxdriverproject.org, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com,
        Linux Kernel ML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] hyperv: make HYPERV a menuconfig to ease disabling it all

On 12/13/2017 11:51 PM, Greg KH wrote:
> On Wed, Dec 13, 2017 at 01:23:38PM -0800, Stephen Hemminger wrote:
>> On Wed, 13 Dec 2017 09:54:19 +0100
>> Vincent Legoll <vincent.legoll@...il.com> wrote:
>>
>>> Hello,
>>>
>>> On Sun, Dec 10, 2017 at 6:50 AM, Stephen Hemminger
>>> <stephen@...workplumber.org> wrote:
>>>> Will this break existing configs?  
>>>
>>> I don't think so. Last time I did some similar changes, the kbuild
>>> test robot found some warnings on some configurations, I hope
>>> it will find problems (if any) for that series too (this one is not alone,
>>> I've got a bunch of other similar patches in-flight)
>>>
>>> Thanks
>>
>> NAK
>>
>> Let me give a concrete example of how this will break users.
>>
>> 1. Assume user has a working .config file in their kernel build directory
>> which builds a kernel that works on Hyper-V.
>>
>> 2. Add your patch (or assume it makes into a later version).
>>
>> 3. User then does
>>
>> $ make oldconfig
>> scripts/kconfig/conf  --oldconfig Kconfig
>> *
>> * Restart config...
>> *
>> *
>> * Microsoft Hyper-V guest support
>> *
>> Microsoft Hyper-V guest support (HYPERV_MENU) [N/y] (NEW) 
>>
>> If they hit return, the default value is not enabling HyperV and they
>> will then go on to build a kernel that will not boot on your system.
>>
>> The default MUST be set to Yes.

That should work.

> Or you can just not take these types of odd and silly changes to the
> Kconfig files, and leave it as-is.  I have yet to see the good reason
> why these are needed at all.

Some of us would like to be able to disable many like drivers at one time
instead of having to go down a list of say 20-30 drivers and disable them
one at a time.

-- 
~Randy