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| author | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-02 15:23:39 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2020-03-13 10:05:34 +0900 |
| commit | def2fbffe62c00c330c7f41584a356001179c59c (patch) | |
| tree | a54378cb937f472f0d000ce1d41872791f4457b3 /Documentation/kbuild | |
| parent | 1cd9b3abf5332102d4d967555e7ed861a75094bf (diff) | |
| download | lwn-def2fbffe62c00c330c7f41584a356001179c59c.tar.gz lwn-def2fbffe62c00c330c7f41584a356001179c59c.zip | |
kconfig: allow symbols implied by y to become m
The 'imply' keyword restricts a symbol to y or n, excluding m
when it is implied by y. This is the original behavior since
commit 237e3ad0f195 ("Kconfig: Introduce the "imply" keyword").
However, the author of this feature, Nicolas Pitre, stated that
the 'imply' keyword should not impose any restrictions.
(https://lkml.org/lkml/2020/2/19/714)
I agree, and want to get rid of this tricky behavior.
Suggested-by: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/kconfig-language.rst | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/kbuild/kconfig-language.rst b/Documentation/kbuild/kconfig-language.rst index d0111dd26410..d4d988aea679 100644 --- a/Documentation/kbuild/kconfig-language.rst +++ b/Documentation/kbuild/kconfig-language.rst @@ -173,7 +173,7 @@ applicable everywhere (see syntax). === === ============= ============== n y n N/m/y m y m M/y/n - y y y Y/n + y y y Y/m/n y n * N === === ============= ============== @@ -181,6 +181,16 @@ applicable everywhere (see syntax). ability to hook into a secondary subsystem while allowing the user to configure that subsystem out without also having to unset these drivers. + Note: If the combination of FOO=y and BAR=m causes a link error, + you can guard the function call with IS_REACHABLE():: + + foo_init() + { + if (IS_REACHABLE(CONFIG_BAZ)) + baz_register(&foo); + ... + } + - limiting menu display: "visible if" <expr> This attribute is only applicable to menu blocks, if the condition is |