kconfig: add an option to determine a menu's visibility

This option is aimed to add the possibility to control a menu's visibility
without adding dependency to the expression to all the submenu.

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 7e83aef42c6d..b9d9aa18e6d6 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -152,6 +152,12 @@ struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr
         return menu_add_prop(type, prompt, NULL, dep);
 }
 
+void menu_add_visibility(struct expr *expr)
+{
+        current_entry->visibility = expr_alloc_and(current_entry->visibility,
+            expr);
+}
+
 void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
 {
         menu_add_prop(type, NULL, expr, dep);
@@ -410,6 +416,11 @@ bool menu_is_visible(struct menu *menu)
         if (!menu->prompt)
                 return false;
 
+        if (menu->visibility) {
+                if (expr_calc_value(menu->visibility) == no)
+                        return no;
+        }
+
         sym = menu->sym;
         if (sym) {
                 sym_calc_value(sym);