linux-kernel - [PATCH 10/10] kconfig: turn defaults and additional prompt for choice members into error

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Message-Id: <20240504183333.2031860-10-masahiroy@kernel.org>
Date: Sun,  5 May 2024 03:33:33 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 10/10] kconfig: turn defaults and additional prompt for choice members into error

menu_finalize() warns default properties for choice members and prompts
outside the choice block. These should be hard errors.

While I was here, I moved the checks to slim down menu_finalize().

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

 scripts/kconfig/menu.c   | 10 ----------
 scripts/kconfig/parser.y | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 10 deletions(-)

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index a9b1e451dfe7..bee96c9964fd 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -507,16 +507,6 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
 		    menu->sym && !sym_is_choice_value(menu->sym)) {
 			current_entry = menu;
 			menu->sym->flags |= SYMBOL_CHOICEVAL;
-			for (prop = menu->sym->prop; prop; prop = prop->next) {
-				if (prop->type == P_DEFAULT)
-					prop_warn(prop, "defaults for choice "
-						  "values not supported");
-				if (prop->menu == menu)
-					continue;
-				if (prop->type == P_PROMPT &&
-				    prop->menu->parent->sym != sym)
-					prop_warn(prop, "choice value used outside its choice group");
-			}
 			/* Non-tristate choice values of tristate choices must
 			 * depend on the choice being set to Y. The choice
 			 * values' dependencies were propagated to their
diff --git a/scripts/kconfig/parser.y b/scripts/kconfig/parser.y
index ed86869e5ed0..0a9e249b5dcc 100644
--- a/scripts/kconfig/parser.y
+++ b/scripts/kconfig/parser.y
@@ -476,6 +476,37 @@ assign_val:
 
 %%
 
+/**
+ * choice_check_sanity - check sanity of a choice member
+ *
+ * @menu: menu of the choice member
+ *
+ * Return: -1 if an error is found, 0 otherwise.
+ */
+static int choice_check_sanity(struct menu *menu)
+{
+	struct property *prop;
+	int ret = 0;
+
+	for (prop = menu->sym->prop; prop; prop = prop->next) {
+		if (prop->type == P_DEFAULT) {
+			fprintf(stderr, "%s:%d: error: %s",
+				prop->filename, prop->lineno,
+				"defaults for choice values not supported\n");
+			ret = -1;
+		}
+
+		if (prop->menu != menu && prop->type == P_PROMPT) {
+			fprintf(stderr, "%s:%d: error: %s",
+				prop->filename, prop->lineno,
+				"choice value has a prompt outside its choice group\n");
+			ret = -1;
+		}
+	}
+
+	return ret;
+}
+
 void conf_parse(const char *name)
 {
 	struct menu *menu;
@@ -523,8 +554,16 @@ void conf_parse(const char *name)
 	menu_finalize();
 
 	menu_for_each_entry(menu) {
+		struct menu *child;
+
 		if (menu->sym && sym_check_deps(menu->sym))
 			yynerrs++;
+
+		if (menu->sym && sym_is_choice(menu->sym)) {
+			menu_for_each_sub_entry(child, menu)
+				if (child->sym && choice_check_sanity(child))
+					yynerrs++;
+		}
 	}
 
 	if (yynerrs)
-- 
2.40.1