kconfig: add sym_get_choice_menu() helper

[linux-2.6-block.git] / scripts / kconfig / symbol.c

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 8512c29c84bb896a026d9dfaf016bb73b4284285..23829f44b8f89fe189d52d9d53eb759e2ea6756b 100644 (file)
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -78,6 +78,41 @@ struct property *sym_get_choice_prop(struct symbol *sym)
        return NULL;
 }
 
+/**
+ * sym_get_choice_menu - get the parent choice menu if present
+ *
+ * @sym: a symbol pointer
+ *
+ * Return: a choice menu if this function is called against a choice member.
+ */
+struct menu *sym_get_choice_menu(struct symbol *sym)
+{
+       struct menu *menu = NULL;
+       struct menu *m;
+
+       /*
+        * Choice members must have a prompt. Find a menu entry with a prompt,
+        * and assume it resides inside a choice block.
+        */
+       list_for_each_entry(m, &sym->menus, link)
+               if (m->prompt) {
+                       menu = m;
+                       break;
+               }
+
+       if (!menu)
+               return NULL;
+
+       do {
+               menu = menu->parent;
+       } while (menu && !menu->sym);
+
+       if (menu && menu->sym && sym_is_choice(menu->sym))
+               return menu;
+
+       return NULL;
+}
+
 static struct property *sym_get_default_prop(struct symbol *sym)
 {
        struct property *prop;