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Subject: Re: [gentoo-user] Using an old kernel .config as the basis for a new
 .config
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To: gentoo-user@lists.gentoo.org
References: <20171228195236.GA17094@ACM>
From: Ralph Seichter <m16+gentoo@monksofcool.net>
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Date: Thu, 28 Dec 2017 21:35:01 +0100
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On 28.12.17 20:52, Alan Mackenzie wrote:

> There is some way of initialising a new kernel .config from an existing
> one, I am sure, but I can't find it.

If your previous kernel has IKCONFIG support(*) enabled, I recommend
these steps for a kernel update to keep as many configuration options
as possible:

# eselect kernel set {number}
# cd /usr/src/linux
# zcat /proc/config.gz > .config
# make silentoldconfig

-Ralph

(*) https://wiki.gentoo.org/wiki/Kernel/IKCONFIG_Support