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Message-Id: <20240323085101.1243814-3-masahiroy@kernel.org>
Date: Sat, 23 Mar 2024 17:51:01 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-mips@...r.kernel.org,
linux-kernel@...r.kernel.org,
Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 2/2] kconfig: do not reparent the menu inside a choice block
The boolean 'choice' is meant to list exclusively selected config
options.
You must not add a dependency between choice members, because such a
dependency would create an invisible entry.
In the followint test case, it is impossible to choose 'C'.
[Test Case 1]
choice
prompt "Choose one, but how to choose C?"
config A
bool "A"
config B
bool "B"
config C
bool "C"
depends on A
endchoice
Hence, Kconfig shows the following error message:
Kconfig:1:error: recursive dependency detected!
Kconfig:1: choice <choice> contains symbol C
Kconfig:10: symbol C is part of choice A
Kconfig:4: symbol A is part of choice <choice>
For a resolution refer to Documentation/kbuild/kconfig-language.rst
subsection "Kconfig recursive dependency limitations"
However, Kconfig does not report any error for the following similar
code:
[Test Case 2]
choice
prompt "Choose one, but how to choose B?"
config A
bool "A"
config B
bool "B"
depends on A
config C
bool "C"
endchoice
This is because menu_finalize() reparents the menu tree, making 'B'
a submenu of 'A'.
With reparenting, the menu tree:
choice
|- A
|- B
\- C
.. will be transformed into the following structure:
choice
|- A
| \- B
\- C
Consequently, Kconfig considers only 'A' and 'C' as choice members.
This behavior is awkward. The second test case should be an error too.
Now, let's stop reparenting inside a choice.
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---
scripts/kconfig/conf.c | 5 -----
scripts/kconfig/lkc.h | 2 +-
scripts/kconfig/menu.c | 22 ++++++++++++++++------
scripts/kconfig/parser.y | 2 +-
4 files changed, 18 insertions(+), 13 deletions(-)
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index b5730061872b..965bb40c50e5 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -552,11 +552,6 @@ static int conf_choice(struct menu *menu)
continue;
}
sym_set_tristate_value(child->sym, yes);
- for (child = child->list; child; child = child->next) {
- indent += 2;
- conf(child);
- indent -= 2;
- }
return 1;
}
}
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index e69d7c59d930..e7cc9e985c4f 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -89,7 +89,7 @@ void menu_add_visibility(struct expr *dep);
struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep);
void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);
void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep);
-void menu_finalize(struct menu *parent);
+void menu_finalize(void);
void menu_set_type(int type);
extern struct menu rootmenu;
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 8498481e6afe..3b822cd110f4 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -282,7 +282,7 @@ static void sym_check_prop(struct symbol *sym)
}
}
-void menu_finalize(struct menu *parent)
+static void _menu_finalize(struct menu *parent, bool inside_choice)
{
struct menu *menu, *last_menu;
struct symbol *sym;
@@ -296,7 +296,12 @@ void menu_finalize(struct menu *parent)
* and propagate parent dependencies before moving on.
*/
- if (sym && sym_is_choice(sym)) {
+ bool is_choice = false;
+
+ if (sym && sym_is_choice(sym))
+ is_choice = true;
+
+ if (is_choice) {
if (sym->type == S_UNKNOWN) {
/* find the first choice value to find out choice type */
current_entry = parent;
@@ -394,7 +399,7 @@ void menu_finalize(struct menu *parent)
}
}
- if (sym && sym_is_choice(sym))
+ if (is_choice)
expr_free(parentdep);
/*
@@ -402,8 +407,8 @@ void menu_finalize(struct menu *parent)
* moving on
*/
for (menu = parent->list; menu; menu = menu->next)
- menu_finalize(menu);
- } else if (sym) {
+ _menu_finalize(menu, is_choice);
+ } else if (!inside_choice && sym) {
/*
* Automatic submenu creation. If sym is a symbol and A, B, C,
* ... are consecutive items (symbols, menus, ifs, etc.) that
@@ -463,7 +468,7 @@ void menu_finalize(struct menu *parent)
/* Superset, put in submenu */
expr_free(dep2);
next:
- menu_finalize(menu);
+ _menu_finalize(menu, false);
menu->parent = parent;
last_menu = menu;
}
@@ -582,6 +587,11 @@ void menu_finalize(struct menu *parent)
}
}
+void menu_finalize(void)
+{
+ _menu_finalize(&rootmenu, false);
+}
+
bool menu_has_prompt(struct menu *menu)
{
if (!menu->prompt)
diff --git a/scripts/kconfig/parser.y b/scripts/kconfig/parser.y
index b45bfaf0a02b..7fb996612c96 100644
--- a/scripts/kconfig/parser.y
+++ b/scripts/kconfig/parser.y
@@ -515,7 +515,7 @@ void conf_parse(const char *name)
menu_add_prompt(P_MENU, "Main menu", NULL);
}
- menu_finalize(&rootmenu);
+ menu_finalize();
menu = &rootmenu;
while (menu) {
--
2.40.1
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