linux-kernel - [PATCH 1/2] kconfig: Show menuconfigs as menus in the .config file

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Message-Id: <20211213100043.45645-2-arielmarcovitch@gmail.com>
Date:   Mon, 13 Dec 2021 12:00:42 +0200
From:   Ariel Marcovitch <arielmarcovitch@...il.com>
To:     masahiroy@...nel.org
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ariel Marcovitch <arielmarcovitch@...il.com>
Subject: [PATCH 1/2] kconfig: Show menuconfigs as menus in the .config file

Until now, menuconfigs were considered configs because they had non-zero
sym attribute. This meant that instead of having the nice menu comment
block in the .config output file, they were merely shown as single
configs.

For example:
```Kconfig
menu "Foo"
endmenu

menuconfig BAR
	bool "Bar"

config OTHER
	bool "Other"
	depends on BAR
```

Will be shown as:
```.config
 #
 # Foo
 #
 # end of Foo

 CONFIG_BAR=y
 CONFIG_OTHER=y
```

Instead of using the sym attribute to decide whether or not to print the
menu block comment, check menu->prompt->type explicitly (after checking
that menu_is_visible(menu) which means menu->prompt is not none). The
only prompt types we actually show as menus are P_MENU and P_COMMENT. At
the end of the menu we need to show the end of block only for P_MENU
(although P_COMMENT prompts will not get to this flow because they don't
have children).

Signed-off-by: Ariel Marcovitch <arielmarcovitch@...il.com>
---
 scripts/kconfig/confdata.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 42bc56ee238c..9f2c22f46ee0 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -874,16 +874,21 @@ int conf_write(const char *name)
 	menu = rootmenu.list;
 	while (menu) {
 		sym = menu->sym;
-		if (!sym) {
-			if (!menu_is_visible(menu))
-				goto next;
-			str = menu_get_prompt(menu);
-			fprintf(out, "\n"
-				     "#\n"
-				     "# %s\n"
-				     "#\n", str);
-			need_newline = false;
-		} else if (!(sym->flags & SYMBOL_CHOICE) &&
+
+		if (menu_is_visible(menu)) {
+			enum prop_type type = menu->prompt->type;
+
+			if (type == P_MENU || type == P_COMMENT) {
+				str = menu_get_prompt(menu);
+				fprintf(out, "\n"
+					"#\n"
+					"# %s\n"
+					"#\n", str);
+				need_newline = false;
+			}
+		}
+
+		if (sym && !(sym->flags & SYMBOL_CHOICE) &&
 			   !(sym->flags & SYMBOL_WRITTEN)) {
 			sym_calc_value(sym);
 			if (!(sym->flags & SYMBOL_WRITE))
@@ -904,7 +909,8 @@ int conf_write(const char *name)
 		if (menu->next)
 			menu = menu->next;
 		else while ((menu = menu->parent)) {
-			if (!menu->sym && menu_is_visible(menu) &&
+			if (menu_is_visible(menu) &&
+			    menu->prompt->type == P_MENU &&
 			    menu != &rootmenu) {
 				str = menu_get_prompt(menu);
 				fprintf(out, "# end of %s\n", str);
-- 
2.25.1