[PATCH] fix allmodconfig breakage

[Al Viro <viro@ZenIV.linux.org.uk>]

	If you use KCONFIG_ALLCONFIG (even with empty file) you get
broken allmodconfig/allyesconfig; CONFIG_MODULES gets turned off,
with obvious massive fallout.

	Breakage had been introduced when conf_set_all_new_symbols()
got used for allmodconfig et.al.

	What happens is that sym_calc_value(modules_sym) done in
conf_read_simple() sets SYMBOL_VALID on both modules_sym and MODULES.
When we get to conf_set_all_new_symbols(), we set sym->def[S_DEF_USER]
on everything, but it has no effect on sym->curr for the symbols that
already have SYMBOL_VALID - these are stuck.

	Solution: use sym_clear_all_valid() in there.  Note that it
makes reevaluation of modules_sym redundant - sym_clear_all_valid()
will do that itself.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index b91cf24..830d9ea 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -852,8 +852,7 @@ void conf_set_all_new_symbols(enum conf_def_mode mode)
 
 	}
 
-	if (modules_sym)
-		sym_calc_value(modules_sym);
+	sym_clear_all_valid();
 
 	if (mode != def_random)
 		return;