From: Ulf Magnusson <ulfalizer@gmail.com>
Date: Sun, 14 Jan 2018 14:12:05 +0000 (+0100)
Subject: kconfig: Clarify choice dependency propagation
X-Git-Tag: v4.16-rc1~105^2~6
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=d3465af60f4471b7b6201928e709bc137fdbee3e;p=linux.git

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>
---

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 7634d567e779..dcf22008b2d6 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -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;