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kconfig: Clarify choice dependency propagation 

It's easy to miss that choices are special-cased to pass on their mode
as the parent dependency.

No functional changes. Only comments added.

Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Ulf Magnusson 2018-01-14 15:12:05 +01:00 committed by Masahiro Yamada
parent 3e41ba05b6
commit d3465af60f
1 changed files with 7 additions and 0 deletions
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7
scripts/kconfig/menu.c
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@ -323,6 +323,13 @@ void menu_finalize(struct menu *parent)
if (menu->sym && menu->sym->type == S_UNKNOWN)
menu_set_type(sym->type);
}
/*
* Use the choice itself as the parent dependency of
* the contained items. This turns the mode of the
* choice into an upper bound on the visibility of the
* choice value symbols.
*/
parentdep = expr_alloc_symbol(sym);
} else if (parent->prompt)
parentdep = parent->prompt->visible.expr;