From 297481173b8c1f69b93a201ec1ee6dfc368be8b6 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sat, 17 Feb 2018 03:38:32 +0900 Subject: [PATCH] kconfig: set SYMBOL_AUTO to the symbol marked with defconfig_list The 'defconfig_list' is a weird attribute. If the '.config' is missing, conf_read_simple() iterates over all visible defaults, then it uses the first one for which fopen() succeeds. config DEFCONFIG_LIST string depends on !UML option defconfig_list default "/lib/modules/$UNAME_RELEASE/.config" default "/etc/kernel-config" default "/boot/config-$UNAME_RELEASE" default "$ARCH_DEFCONFIG" default "arch/$ARCH/defconfig" However, like other symbols, the first visible default is always written out to the .config file. This might be different from what has been actually used. For example, on my machine, the third one "/boot/config-$UNAME_RELEASE" is opened, like follows: $ rm .config $ make oldconfig 2>/dev/null config/conf --oldconfig Kconfig # # using defaults found in /boot/config-4.4.0-112-generic # * * Restart config... * * * IRQ subsystem * Expose irq internals in debugfs (GENERIC_IRQ_DEBUGFS) [N/y/?] (NEW) However, the resulted .config file contains the first one since it is visible: $ grep CONFIG_DEFCONFIG_LIST .config CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config" In order to stop confusing people, prevent this CONFIG option from being written to the .config file. Signed-off-by: Masahiro Yamada Reviewed-by: Ulf Magnusson Signed-off-by: Christian Lamparter --- config/menu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/config/menu.c b/config/menu.c index 9922285..36cd3e1 100644 --- a/config/menu.c +++ b/config/menu.c @@ -212,6 +212,7 @@ void menu_add_option(int token, char *arg) sym_defconfig_list = current_entry->sym; else if (sym_defconfig_list != current_entry->sym) zconf_error("trying to redefine defconfig symbol"); + sym_defconfig_list->flags |= SYMBOL_AUTO; break; case T_OPT_ENV: prop_add_env(arg); -- 2.31.1