[PATCH] kconfig: preset config during all*config

Allow to force setting of config variables during all{no,mod,yes,random}config
to a specific value.  For that conf first checks the KCONFIG_ALLCONFIG
environment variable for a file name, otherwise it checks for
all{no,mod,yes,random}.config and all.config.  The file is a normal config
file, which presets the config variables, but they are still subject to normal
dependency checks.

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

3 files changed, 45 insertions, 3 deletions

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index dffbf2ea1f9d..8ba5d29d3d42 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -82,6 +82,15 @@ static void conf_askvalue(struct symbol *sym, const char *def)
         }
 
         switch (input_mode) {
+        case set_no:
+        case set_mod:
+        case set_yes:
+        case set_random:
+                if (sym_has_value(sym)) {
+                        printf("%s\n", def);
+                        return;
+                }
+                break;
         case ask_new:
         case ask_silent:
                 if (sym_has_value(sym)) {
@@ -558,6 +567,27 @@ int main(int ac, char **av)
         case ask_new:
                 conf_read(NULL);
                 break;
+        case set_no:
+        case set_mod:
+        case set_yes:
+        case set_random:
+                name = getenv("KCONFIG_ALLCONFIG");
+                if (name && !stat(name, &tmpstat)) {
+                        conf_read_simple(name);
+                        break;
+                }
+                switch (input_mode) {
+                case set_no:     name = "allno.config"; break;
+                case set_mod:    name = "allmod.config"; break;
+                case set_yes:    name = "allyes.config"; break;
+                case set_random: name = "allrandom.config"; break;
+                default: break;
+                }
+                if (!stat(name, &tmpstat))
+                        conf_read_simple(name);
+                else if (!stat("all.config", &tmpstat))
+                        conf_read_simple("all.config");
+                break;
         default:
                 break;
         }
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 02f670cc6bb9..4bba6202b79e 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -69,15 +69,13 @@ char *conf_get_default_confname(void)
         return name;
 }
 
-int conf_read(const char *name)
+int conf_read_simple(const char *name)
 {
         FILE *in = NULL;
         char line[1024];
         char *p, *p2;
         int lineno = 0;
         struct symbol *sym;
-        struct property *prop;
-        struct expr *e;
         int i;
 
         if (name) {
@@ -232,6 +230,19 @@ int conf_read(const char *name)
 
         if (modules_sym)
                 sym_calc_value(modules_sym);
+        return 0;
+}
+
+int conf_read(const char *name)
+{
+        struct symbol *sym;
+        struct property *prop;
+        struct expr *e;
+        int i;
+
+        if (conf_read_simple(name))
+                return 1;
+
         for_all_symbols(i, sym) {
                 sym_calc_value(sym);
                 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index 6dc6d0c48e7a..b6a389c5fcbd 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -2,6 +2,7 @@
 /* confdata.c */
 P(conf_parse,void,(const char *name));
 P(conf_read,int,(const char *name));
+P(conf_read_simple,int,(const char *name));
 P(conf_write,int,(const char *name));
 
 /* menu.c */