kconfig: Fix defconfig when one choice menu selects options that another choice menu depends on

The defconfig and Kconfig combination below, which is based on 3.10-rc4
Kconfigs, resulted in several options getting set to "m" instead of "y".

defconfig.choice:
---8<---
CONFIG_MODULES=y
CONFIG_USB_ZERO=y
---8<---

Kconfig.choice:
---8<---
menuconfig MODULES
	bool "Enable loadable module support"

config CONFIGFS_FS
	tristate "Userspace-driven configuration filesystem"

config OCFS2_FS
        tristate "OCFS2 file system support"
        depends on CONFIGFS_FS
        select CRC32

config USB_LIBCOMPOSITE
	tristate
	select CONFIGFS_FS

choice
	tristate "USB Gadget Drivers"
	default USB_ETH

config USB_ZERO
	tristate "Gadget Zero (DEVELOPMENT)"
	select USB_LIBCOMPOSITE

config USB_ETH
	tristate "Ethernet Gadget (with CDC Ethernet support)"
	select USB_LIBCOMPOSITE

endchoice

config CRC32
        tristate "CRC32/CRC32c functions"
        default y

choice
        prompt "CRC32 implementation"
        depends on CRC32
        default CRC32_SLICEBY8

config CRC32_SLICEBY8
        bool "Slice by 8 bytes"

endchoice
---8<---

$ scripts/kconfig/conf --defconfig=defconfig.choice Kconfig.choice

would result in:

.config:
---8<---
CONFIG_MODULES=y
CONFIG_CONFIGFS_FS=m
CONFIG_USB_LIBCOMPOSITE=m
CONFIG_USB_ZERO=m
CONFIG_CRC32=y
CONFIG_CRC32_SLICEBY8=y
---8<---

when the expected result would be:

.config:
---8<---
CONFIG_MODULES=y
CONFIG_CONFIGFS_FS=y
CONFIG_USB_LIBCOMPOSITE=y
CONFIG_USB_ZERO=y
CONFIG_CRC32=y
CONFIG_CRC32_SLICEBY8=y
---8<---

Signed-off-by: Arve Hjønnevåg <arve@android.com>
[yann.morin.1998@free.fr: add the resulting .config to commit log,
                          remove unneeded USB_GADGET from the defconfig]
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

4 files changed, 25 insertions, 4 deletions

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 43eda40c3838..35e0f164ef81 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -1083,7 +1083,7 @@ static void randomize_choice_values(struct symbol *csym)
         csym->flags &= ~(SYMBOL_VALID);
 }
 
-static void set_all_choice_values(struct symbol *csym)
+void set_all_choice_values(struct symbol *csym)
 {
         struct property *prop;
         struct symbol *sym;
@@ -1100,7 +1100,7 @@ static void set_all_choice_values(struct symbol *csym)
         }
         csym->flags |= SYMBOL_DEF_USER;
         /* clear VALID to get value calculated */
-        csym->flags &= ~(SYMBOL_VALID);
+        csym->flags &= ~(SYMBOL_VALID | SYMBOL_NEED_SET_CHOICE_VALUES);
 }
 
 void conf_set_all_new_symbols(enum conf_def_mode mode)
@@ -1202,6 +1202,14 @@ void conf_set_all_new_symbols(enum conf_def_mode mode)
          * selected in a choice block and we set it to yes,
          * and the rest to no.
          */
+        if (mode != def_random) {
+                for_all_symbols(i, csym) {
+                        if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
+                            sym_is_choice_value(csym))
+                                csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
+                }
+        }
+
         for_all_symbols(i, csym) {
                 if (sym_has_value(csym) || !sym_is_choice(csym))
                         continue;
@@ -1209,7 +1217,5 @@ void conf_set_all_new_symbols(enum conf_def_mode mode)
                 sym_calc_value(csym);
                 if (mode == def_random)
                         randomize_choice_values(csym);
-                else
-                        set_all_choice_values(csym);
         }
 }
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index cdd48600e02a..df198a5f4822 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -106,6 +106,9 @@ struct symbol {
 #define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
 #define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
 
+/* choice values need to be set before calculating this symbol value */
+#define SYMBOL_NEED_SET_CHOICE_VALUES  0x100000
+
 #define SYMBOL_MAXLENGTH        256
 #define SYMBOL_HASHSIZE         9973
 
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index f8aee5fc6d5e..0c8d4191ca87 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -87,6 +87,7 @@ char *conf_get_default_confname(void);
 void sym_set_change_count(int count);
 void sym_add_change_count(int count);
 void conf_set_all_new_symbols(enum conf_def_mode mode);
+void set_all_choice_values(struct symbol *csym);
 
 struct conf_printer {
         void (*print_symbol)(FILE *, struct symbol *, const char *, void *);
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index ecc5aa5f865d..ab8f4c835933 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -300,6 +300,14 @@ void sym_calc_value(struct symbol *sym)
 
         if (sym->flags & SYMBOL_VALID)
                 return;
+
+        if (sym_is_choice_value(sym) &&
+            sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES) {
+                sym->flags &= ~SYMBOL_NEED_SET_CHOICE_VALUES;
+                prop = sym_get_choice_prop(sym);
+                sym_calc_value(prop_get_symbol(prop));
+        }
+
         sym->flags |= SYMBOL_VALID;
 
         oldval = sym->curr;
@@ -425,6 +433,9 @@ void sym_calc_value(struct symbol *sym)
 
         if (sym->flags & SYMBOL_AUTO)
                 sym->flags &= ~SYMBOL_WRITE;
+
+        if (sym->flags & SYMBOL_NEED_SET_CHOICE_VALUES)
+                set_all_choice_values(sym);
 }
 
 void sym_clear_all_valid(void)