kconfig: refactor code in symbol.c

Move logic to determine default for a choice to
a separate function.
No functional changes.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

2 files changed, 34 insertions, 13 deletions

diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index ce6549cdaccf..755b8190eb64 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -126,6 +126,7 @@ void sym_init(void);
 void sym_clear_all_valid(void);
 void sym_set_all_changed(void);
 void sym_set_changed(struct symbol *sym);
+struct symbol *sym_choice_default(struct symbol *sym);
 struct symbol *sym_check_deps(struct symbol *sym);
 struct property *prop_alloc(enum prop_type type, struct symbol *sym);
 struct symbol *prop_get_symbol(struct property *prop);
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index bc1e1584e2da..0a013ab3ae27 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -226,22 +226,18 @@ static void sym_calc_visibility(struct symbol *sym)
         }
 }
 
-static struct symbol *sym_calc_choice(struct symbol *sym)
+/*
+ * Find the default symbol for a choice.
+ * First try the default values for the choice symbol
+ * Next locate the first visible choice value
+ * Return NULL if none was found
+ */
+struct symbol *sym_choice_default(struct symbol *sym)
 {
         struct symbol *def_sym;
         struct property *prop;
         struct expr *e;
 
-        /* first calculate all choice values' visibilities */
-        prop = sym_get_choice_prop(sym);
-        expr_list_for_each_sym(prop->expr, e, def_sym)
-                sym_calc_visibility(def_sym);
-
-        /* is the user choice visible? */
-        def_sym = sym->def[S_DEF_USER].val;
-        if (def_sym && def_sym->visible != no)
-                return def_sym;
-
         /* any of the defaults visible? */
         for_all_defaults(sym, prop) {
                 prop->visible.tri = expr_calc_value(prop->visible.expr);
@@ -258,11 +254,35 @@ static struct symbol *sym_calc_choice(struct symbol *sym)
                 if (def_sym->visible != no)
                         return def_sym;
 
-        /* no choice? reset tristate value */
-        sym->curr.tri = no;
+        /* failed to locate any defaults */
         return NULL;
 }
 
+static struct symbol *sym_calc_choice(struct symbol *sym)
+{
+        struct symbol *def_sym;
+        struct property *prop;
+        struct expr *e;
+
+        /* first calculate all choice values' visibilities */
+        prop = sym_get_choice_prop(sym);
+        expr_list_for_each_sym(prop->expr, e, def_sym)
+                sym_calc_visibility(def_sym);
+
+        /* is the user choice visible? */
+        def_sym = sym->def[S_DEF_USER].val;
+        if (def_sym && def_sym->visible != no)
+                return def_sym;
+
+        def_sym = sym_choice_default(sym);
+
+        if (def_sym == NULL)
+                /* no choice? reset tristate value */
+                sym->curr.tri = no;
+
+        return def_sym;
+}
+
 void sym_calc_value(struct symbol *sym)
 {
         struct symbol_value newval, oldval;