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| author | Ulf Magnusson <ulfalizer@gmail.com> | 2018-01-14 10:56:20 +0100 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-01-22 00:49:32 +0900 |
| commit | 3e41ba05b6d60cd54e64639b308be62c12308a04 (patch) | |
| tree | 9c99091340bd13b1a2b57077581598e8bbffe6a6 /scripts/kconfig/menu.c | |
| parent | eea199b445f64c038b1d868bd52700510843ccd6 (diff) | |
| download | linux-3e41ba05b6d60cd54e64639b308be62c12308a04.tar.gz linux-3e41ba05b6d60cd54e64639b308be62c12308a04.tar.bz2 linux-3e41ba05b6d60cd54e64639b308be62c12308a04.zip | |
kconfig: Document SYMBOL_OPTIONAL logic
Not obvious, especially if you don't already know how choices are
implemented.
No functional changes. Only comments added.
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts/kconfig/menu.c')
| -rw-r--r-- | scripts/kconfig/menu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c index 47bec3434fef..7634d567e779 100644 --- a/scripts/kconfig/menu.c +++ b/scripts/kconfig/menu.c @@ -549,6 +549,15 @@ void menu_finalize(struct menu *parent) sym->flags |= SYMBOL_WARNED; } + /* + * For non-optional choices, add a reverse dependency (corresponding to + * a select) of '<visibility> && m'. This prevents the user from + * setting the choice mode to 'n' when the choice is visible. + * + * This would also work for non-choice symbols, but only non-optional + * choices clear SYMBOL_OPTIONAL as of writing. Choices are implemented + * as a type of symbol. + */ if (sym && !sym_is_optional(sym) && parent->prompt) { sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr, expr_alloc_and(parent->prompt->visible.expr, |