[PATCH 6/8] kconfig: fix randomising choice entries in presence of KCONFIG_ALLCONFIG

Yann E. MORIN
2013-04-24T22:30:47Z

From: "Yann E. MORIN" <yann.morin.1998@free.fr>

Currently, randconfig does randomise choice entries, unless KCONFIG_ALLCONFIG
is specified.

For example, given those two files (Thomas' test-case):

---8<--- Config.test.in
config OPTIONA
bool "Option A"

choice
prompt "This is a choice"

config CHOICE_OPTIONA
bool "Choice Option A"

config CHOICE_OPTIONB
bool "Choice Option B"

endchoice

config OPTIONB
bool "Option B"
---8<--- Config.test.in

---8<--- config.defaults
CONFIG_OPTIONA=y
---8<--- config.defaults

And running:
./scripts/kconfig/conf --randconfig Config.test.in

does properly randomise the two choice symbols (and the two booleans).

However, running:
KCONFIG_ALLCONFIG=config.defaults \
./scripts/kconfig/conf --randconfig Config.test.in

does *not* reandomise the two choice entries, and only CHOICE_OPTIONA
will ever be selected. (OPTIONA will always be set (expected), and
OPTIONB will be be properly randomised (expected).)

This patch defers setting that a choice has a value until a symbol for
that choice is indeed set, so that choices are properly randomised when
KCONFIG_ALLCONFIG is set, but not if a symbol for that choice is set.

Also, as a side-efect, this patch fixes the following case:

---8<---
choice
config OPTION_A
bool "Option A"
config OPTION_B
bool "Option B"
config OPTION_C
bool "Option C"
endchoice
---8<---

which could previously generate such .config files:

---8<--- ---8<---
CONFIG_OPTION_A=y CONFIG_OPTION_A=y
CONFIG_OPTION_B=y # CONFIG_OPTION_B is not set
# CONFIG_OPTION_C is not set CONFIG_OPTION_C=y
---8<--- ---8<---

Ie., the first entry in a choice is always set, plus zero or one of
the other options may be set.

This patch ensures that only one option may be set for a choice.

Reported-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Arnaud Lacombe <lacombar@gmail.com>

---
Changes v2 -> v3
- ensure only one symbol is set in a choice

Changes v1 -> v2:
- further postpone setting that a choice has a value until
one is indeed set
- do not print symbols that are part of an invisible choice
---
scripts/kconfig/confdata.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 2e35d4b..8927480 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -288,8 +288,6 @@ load:
for_all_symbols(i, sym) {
sym->flags |= SYMBOL_CHANGED;
sym->flags &= ~(def_flags|SYMBOL_VALID);
- if (sym_is_choice(sym))
- sym->flags |= def_flags;
switch (sym->type) {
case S_INT:
case S_HEX:
@@ -379,13 +377,13 @@ setsym:
case mod:
if (cs->def[def].tri == yes) {
conf_warning("%s creates inconsistent choice state", sym->name);
- cs->flags &= ~def_flags;
}
break;
case yes:
if (cs->def[def].tri != no)
conf_warning("override: %s changes choice state", sym->name);
cs->def[def].val = sym;
+ cs->flags |= def_flags;
break;
}
cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
@@ -791,6 +789,8 @@ int conf_write(const char *name)
sym_calc_value(sym);
if (!(sym->flags & SYMBOL_WRITE))
goto next;
+ if (sym_is_choice_value(sym) && !menu_is_visible(menu->parent))
+ goto next;
sym->flags &= ~SYMBOL_WRITE;

conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
@@ -1077,6 +1077,7 @@ static void randomize_choice_values(struct symbol *csym)
else {
sym->def[S_DEF_USER].tri = no;
}
+ sym->flags &= ~(SYMBOL_VALID);
}
csym->flags |= SYMBOL_DEF_USER;
/* clear VALID to get value calculated */
--
1.7.10.4