Re: [gentoo-user] Using an old kernel .config as the basis for a new .config

[Alan Mackenzie <acm@muc.de>]

Hello, Jack.

On Thu, Dec 28, 2017 at 15:05:04 -0500, Jack wrote:
> On 2017.12.28 14:52, Alan Mackenzie wrote:
> > Hello, Gentoo.

> > Having just built linux-4.14.7-gentoo, suddenly a new version of the  
> > kernel, linux-4.14.8-gentoo-r1 has become stable.  Configuring a  
> > kernel from scratch is a repetitive drudge.

> > There is some way of initialising a new kernel .config from an  
> > existing one, I am sure, but I can't find it.  I've looked at the  
> > Gentoo wiki, I've looked at (some of) the kernel's own  
> > documentation.  The nearest I can find is make oldconfig, which  
> > supposedly does what I want, but it just seems to start off with a  
> > default .config and go through the hundreds of questions one at a  
> > time.

> > So, would some kind soul please tell me how to get my old .config  
> > into a new one properly.  Thanks!

> You need to copy your old .config into the new kernel source  
> directory.  "make oldconfig" then uses those values, and only asks you  
> about new items.  It sounds like it was asking about everything because  
> it didn't have the old file as a starting point - so was starting from  
> scratch.

Thanks, that was exactly what I needed.  In the end, the configurer
didn't ask any questions.  It looks like there were no new options
introduced by 4.18.8-r1.

> Jack

-- 
Alan Mackenzie (Nuremberg, Germany).