[PATCH] kconfig: Make KCONFIG_ALLCONFIG work with randconfig.

Paul Mundt
2007-11-28T12:20:40Z

Adrian mentioned a few weeks ago that KCONFIG_ALLCONFIG is the way to
go to ensure that things like allyes/allmod/allnoconfig work with a
constrained set of symbols, with the implication that this holds
true for randconfig as well.

While allyes/mod/noconfigs do seem to work fine with KCONFIG_ALLCONFIG
provisions, randconfig tramples all over the provided values at perhaps
not surprisingly, random.

Debugging this a bit, there seemed to be two issues:

- SYMBOL_DEF and SYMBOL_DEF_USER overlap, which made
def_sym->flags the same regardless of whether we came from an
KCONFIG_ALLCONFIG path or not.

- clobbering of the fixed value in conf_choice() by way of
random() def assignment.

While I don't pretend to have any idea what I'm doing in Kconfig,
changing SYMBOL_DEF_USER to reuse the SYMBOL_DEF3 bit (and thereby
separating it from SYMBOL_DEF) in addition to checking the def_sym flag
before randomly assigning a new value ended up fixing things up.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

---

scripts/kconfig/conf.c | 9 ++++++++-
scripts/kconfig/expr.h | 3 +--
2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index a38787a..61a61df 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -374,7 +374,14 @@ static int conf_choice(struct menu *menu)
continue;
break;
case set_random:
- def = (random() % cnt) + 1;
+ /*
+ * Defined symbols need to be honoured even in
+ * the randomization case, or else symbols set
+ * via the KCONFIG_ALLCONFIG path are clobbered.
+ * - PFM.
+ */
+ if (!(def_sym->flags & SYMBOL_DEF))
+ def = (random() % cnt) + 1;
case set_default:
case set_yes:
case set_mod:
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index a195986..f5b4873 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -95,9 +95,8 @@ struct symbol {
#define SYMBOL_CHECKED 0x2000
#define SYMBOL_WARNED 0x8000
#define SYMBOL_DEF 0x10000
-#define SYMBOL_DEF_USER 0x10000
#define SYMBOL_DEF_AUTO 0x20000
-#define SYMBOL_DEF3 0x40000
+#define SYMBOL_DEF_USER 0x40000
#define SYMBOL_DEF4 0x80000

#define SYMBOL_MAXLENGTH 256