Kernel .config file overwritten

[Valdis.Kletnieks at vt.edu]

On Sat, 25 May 2013 10:16:47 +0530, "Lakshmipathi.G" said:

> I wanted to compile my kernel from sources. I needed to add one line in
> .config file,
> because that option is not possible to change by 'make menuconfig'.

If menuconfig won't let you change it, there's several possibilities:

1) It's an "internal" config option that wsn't intended to be changed
directly (it's all done via SELECT and friends).  This is indicated in
the Kconfig file by a lack of HELP text.  If you're trying to change
one of these, stop and ask yourself *why* - such variables almost *never*
make sense to change by themselves - that's why they're inaccessible
and choosing something that requires the services will do a SELECT of
it to include it.  You almost certainly intended to turn on something else
and let that variable's SELECT turn on the hidden config variable.

2) You're missing a pre-requisite that needs to be on.  Go find it and
turn it on and try again.  note that inside menuconfig, entering '/'
and then (part of) a config variable name will show you what it depends on,
and which menu it's in.

3) Simply editing the .config by hand is usually *not* a good idea unless
you know exactly what you're doing.  As you noticed, the kbuild system will
do a 'make oldconfig' if you tried to do that - that is to make sure that
any DEPENDS and SELECTS are re-driven.
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