Re: [PATCH v3] Documentation/kbuild: Document the kconfig choice default value
From: Masahiro Yamada <masahiroy@kernel.org>
Date: 2021-08-05 12:48:39
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On Tue, Jul 20, 2021 at 5:29 AM Robert Richter [off-list ref] wrote:
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Document how choice defaults are determined: Default of a choice is its first visible choice element unless it is explicitly set by the 'default' property [1]. Choice elements do not support default attributes. [2] [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/kconfig/symbol.c?h=v5.14-rc1#n245 [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/kconfig/menu.c?h=v5.14-rc1#n494 Signed-off-by: Robert Richter <redacted> --- v3: Fix base of v2 (rebased onto v5.14-rc2) v2: clarification on 'default' attribute of a choice added example --- Documentation/kbuild/kconfig-language.rst | 15 +++++++++++++++ 1 file changed, 15 insertions(+)diff --git a/Documentation/kbuild/kconfig-language.rst b/Documentation/kbuild/kconfig-language.rst index 98c24183d8c3..d919dde0bcbf 100644 --- a/Documentation/kbuild/kconfig-language.rst +++ b/Documentation/kbuild/kconfig-language.rst@@ -417,6 +417,21 @@ definitions of that choice. If a [symbol] is associated to the choice, then you may define the same choice (i.e. with the same entries) in another place. +The default value of a choice is set to the first visible choice +element unless it is explicitly set by the 'default' property. + +Note: + Choice options do not support the 'default' attribute. + +E.g.:: + + choice + default C1 + config C0 + config C1 + # no default attribute here + endchoice + comment:: "comment" <prompt> --2.29.2
I am not sure whether this note is needed or not, anyway the code example is wrong. Kconfig:3:warning: config symbol defined without type Kconfig:4:warning: config symbol defined without type Kconfig:3:warning: choice value must have a prompt Kconfig:4:warning: choice value must have a prompt Kconfig:1:warning: config symbol defined without type Kconfig:1:warning: choice must have a prompt -- Best Regards Masahiro Yamada