On 17 Jul 2007, at 21:11, Billy Wayne McCann wrote:
It is sometimes possible to save time by re-using the
configuration file
from your old kernel when configuring the new one. Note that this is
generally unsafe -- too many changes between every kernel release for
this to be a reliable upgrade path.
The only situation where this is appropriate is when upgrading
from one
Gentoo kernel revision to another. For example, the changes made
between
gentoo-sources-2.6.9-r1 and gentoo-sources-2.6.9-r2 will be very
small,
so it is usually OK to use the following method. However, it is not
appropriate to use it in the example used throughout this document:
upgrading from 2.6.8 to 2.6.9.
Whilst I'll admit to having been caught out when upgrading from
2.6.19 to 2.6.20, I can't imagine that many people go through the
entire list of options in `make menuconfig` every time they upgrade
the kernel.
I tend to run `emerge sync once a week or once a month, and I ignore
trivial kernel version bumps (-r2 to -r3 &c), so the only time I
upgrade is in exactly the circumstances described.
For a long time I copied the old .config file over verbatim and it's
only recently I even realised to use `make oldconfig`. This apparent
change in the way the options are laid out between the 2.6.19 and
2.6.20 config files is the first time it's failed on me in over 3
years, so I don't see the need to be overly paranoid about it.
Stroller.
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