kconfig: fix MODULES-related bug in case of no .config

There seems to be a kconfig bug due to MODULES not always being
evaluated if no .config is found. Take the following Kconfig as an
example:

config MODULES
	def_bool y

config FOO
	def_tristate m

With no .config, the following configuration is generated:

CONFIG_MODULES=y
CONFIG_FOO=y

With an empty .config, the following:

CONFIG_MODULES=y
CONFIG_FOO=m

Tristate choice statements can also exhibit the problem, due to having an
implicit rev_dep (select) containing "m".

The problem is that MODULES is never evaluted in conf_read_simple() unless
there's a .config. The following patch fixes this.

Signed-off-by: Ulf Magnusson <ulfalizer.lkml@gmail.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 4 insertions, 1 deletions

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 210a49e27d47..8dce5862550d 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -170,8 +170,11 @@ int conf_read_simple(const char *name, int def)
                 if (in)
                         goto load;
                 sym_add_change_count(1);
-                if (!sym_defconfig_list)
+                if (!sym_defconfig_list) {
+                        if (modules_sym)
+                                sym_calc_value(modules_sym);
                         return 1;
+                }
 
                 for_all_defaults(sym_defconfig_list, prop) {
                         if (expr_calc_value(prop->visible.expr) == no ||