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To: Linus Torvalds <torvalds@linux-foundation.org>,
	Dan Carpenter <dan.carpenter@oracle.com>
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From: Randy Dunlap <rdunlap@infradead.org>
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Date: Thu, 6 Jul 2017 10:11:26 -0700
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Cc: ksummit <ksummit-discuss@lists.linuxfoundation.org>,
	Michal Hocko <mhocko@kernel.org>
Subject: Re: [Ksummit-discuss] [TECH TOPIC] is Kconfig a bit hard sometimes?
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On 07/06/2017 09:41 AM, Linus Torvalds wrote:
> On Thu, Jul 6, 2017 at 7:40 AM, Dan Carpenter <dan.carpenter@oracle.com> wrote:
>> People have mentioned "make oldconfig" but I've never had a lot of luck
>> with that.  It always just prints "* Restart config..." and deletes my
>> config.
> 
> Really?
> 
> For me, "make oldconfig" is pretty much the only thing I ever use
> (apart from build testing).
> 
> It's very convenient once you have a baseline, and want to just get
> the new questions for when the Kconfig files change. It's also how I
> notice when somebody adds a new config entry that doesn't default to
> 'n'.
> 
> It's also very convenient when you end up changing your config: just
> edit the damn .config file directly, and then re-run "make oldconfig"
> just to make sure everything gets updated (and then you'll notice that
> you tried to disable some config entry, but it got re-enabled again
> because there was something else that depended on it and selected it
> ;)
> 
> So I wonder why it wouldn't work for you.
> 
> Now, admittedly, I literally only ever use two source files: the
> previous ".config" file, and if that is missing (after a "git clean
> -dqfx" or similar), just /etc/kernel-config.
> 
> The oldconfig logic has fallbacks to other cases, but they are all useless imho.
> 
> Also, I build in the source tree. Maybe you use a separate object tree
> and it gets that case wrong.

Nah, I use O=objdir all the time and oldconfig works for me.

-- 
~Randy