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-rw-r--r--Documentation/kbuild/kconfig-language.rst15
1 files changed, 11 insertions, 4 deletions
diff --git a/Documentation/kbuild/kconfig-language.rst b/Documentation/kbuild/kconfig-language.rst
index 79ac2e8184..1fb3f5e619 100644
--- a/Documentation/kbuild/kconfig-language.rst
+++ b/Documentation/kbuild/kconfig-language.rst
@@ -150,6 +150,12 @@ applicable everywhere (see syntax).
That will limit the usefulness but on the other hand avoid
the illegal configurations all over.
+ If "select" <symbol> is followed by "if" <expr>, <symbol> will be
+ selected by the logical AND of the value of the current menu symbol
+ and <expr>. This means, the lower limit can be downgraded due to the
+ presence of "if" <expr>. This behavior may seem weird, but we rely on
+ it. (The future of this behavior is undecided.)
+
- weak reverse dependencies: "imply" <symbol> ["if" <expr>]
This is similar to "select" as it enforces a lower limit on another
@@ -184,7 +190,7 @@ 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,
+ Note: If the combination of FOO=y and BAZ=m causes a link error,
you can guard the function call with IS_REACHABLE()::
foo_init()
@@ -202,6 +208,10 @@ applicable everywhere (see syntax).
imply BAR
imply BAZ
+ Note: If "imply" <symbol> is followed by "if" <expr>, the default of <symbol>
+ will be the logical AND of the value of the current menu symbol and <expr>.
+ (The future of this behavior is undecided.)
+
- limiting menu display: "visible if" <expr>
This attribute is only applicable to menu blocks, if the condition is
@@ -410,9 +420,6 @@ to be set to 'm'. This can be used if multiple drivers for a single
hardware exists and only a single driver can be compiled/loaded into
the kernel, but all drivers can be compiled as modules.
-A choice accepts another option "optional", which allows to set the
-choice to 'n' and no entry needs to be selected.
-
comment::
"comment" <prompt>