>From the KConfig tutorial:
https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt
- reverse dependencies: "select" <symbol> ["if" <expr>]
While normal dependencies reduce the upper limit of a symbol (see
below), reverse dependencies can be used to force a lower limit of
another symbol. The value of the current menu symbol is used as the
minimal value <symbol> can be set to. If <symbol> is selected multiple
times, the limit is set to the largest selection.
Reverse dependencies can only be used with boolean or tristate
symbols.
Note:
*select should be used with care.* select will force
a symbol to a value without visiting the dependencies.
By abusing select you are able to select a symbol FOO even
if FOO depends on BAR that is not set.
In general use select only for non-visible symbols
(no prompts anywhere) and for symbols with no dependencies.
That will limit the usefulness but on the other hand avoid
the illegal configurations all over.
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https://bugs.launchpad.net/bugs/1759893
Title:
[18.04][config] regression: nvme and nvme_core couldn't be built as
modules starting 4.15-rc2
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