kconfig: add defconfig_list/module option

This makes it possible to change two options which were hardcoded sofar.
1. Any symbol can now take the role of CONFIG_MODULES
2. The more useful option is to change the list of default file names,
   which kconfig uses to load the base configuration if .config isn't
   available.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 78a60ba39e54..ee225ced2ce4 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -31,6 +31,7 @@ struct symbol symbol_yes = {
 };
 
 int sym_change_count;
+struct symbol *sym_defconfig_list;
 struct symbol *modules_sym;
 tristate modules_val;
 
@@ -352,10 +353,13 @@ void sym_calc_value(struct symbol *sym)
                 sym->curr.val = sym_calc_choice(sym);
         sym_validate_range(sym);
 
-        if (memcmp(&oldval, &sym->curr, sizeof(oldval)))
+        if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {
                 sym_set_changed(sym);
-        if (modules_sym == sym)
-                modules_val = modules_sym->curr.tri;
+                if (modules_sym == sym) {
+                        sym_set_all_changed();
+                        modules_val = modules_sym->curr.tri;
+                }
+        }
 
         if (sym_is_choice(sym)) {
                 int flags = sym->flags & (SYMBOL_CHANGED | SYMBOL_WRITE);
@@ -449,11 +453,8 @@ bool sym_set_tristate_value(struct symbol *sym, tristate val)
         }
 
         sym->def[S_DEF_USER].tri = val;
-        if (oldval != val) {
+        if (oldval != val)
                 sym_clear_all_valid();
-                if (sym == modules_sym)
-                        sym_set_all_changed();
-        }
 
         return true;
 }