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, 11 insertions, 15 deletions

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index e28cd0c2ca08..5bd66f451189 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -25,15 +25,6 @@ const char conf_def_filename[] = ".config";
 
 const char conf_defname[] = "arch/$ARCH/defconfig";
 
-const char *conf_confnames[] = {
-        ".config",
-        "/lib/modules/$UNAME_RELEASE/.config",
-        "/etc/kernel-config",
-        "/boot/config-$UNAME_RELEASE",
-        conf_defname,
-        NULL,
-};
-
 static void conf_warning(const char *fmt, ...)
 {
         va_list ap;
@@ -98,16 +89,21 @@ int conf_read_simple(const char *name, int def)
         if (name) {
                 in = zconf_fopen(name);
         } else {
-                const char **names = conf_confnames;
-                name = *names++;
-                if (!name)
-                        return 1;
+                struct property *prop;
+
+                name = conf_def_filename;
                 in = zconf_fopen(name);
                 if (in)
                         goto load;
                 sym_change_count++;
-                while ((name = *names++)) {
-                        name = conf_expand_value(name);
+                if (!sym_defconfig_list)
+                        return 1;
+
+                for_all_defaults(sym_defconfig_list, prop) {
+                        if (expr_calc_value(prop->visible.expr) == no ||
+                            prop->expr->type != E_SYMBOL)
+                                continue;
+                        name = conf_expand_value(prop->expr->left.sym->name);
                         in = zconf_fopen(name);
                         if (in) {
                                 printf(_("#\n"