An assumption made in this script is that the config options do not need to be processed because they will simply be in the new config file. This assumption is incorrect. Process the config entries set to "y" because those config entries might have dependencies set to "m". If a config entry is set to "m" and is not loaded directly into the machine, the script will currently turn off that config entry; however, if that turned off config entry is a dependency for a "y" option. that means the config entry set to "y" will also be turned off later when the conf executive file is called. Here is a model of the problem (arrows show dependency): Original config file Config_1 (m) <-- Config_2 (y) Config_1 is not loaded in this example, so it is turned off. After scripts/kconfig/streamline_config.pl, but before scripts/kconfig/conf Config_1 (n) <-- Config_2 (y) After scripts/kconfig/conf Config_1 (n) <-- Config_2 (n) It should also be noted that any module in the dependency chain will also be turned off, even if that module is loaded directly onto the computer. Here is an example: Original config file Config_1 (m) <-- Config_2 (y) <-- Config_3 (m) Config_3 will be loaded in this example. After scripts/kconfig/streamline_config.pl, but before scripts/kconfig/conf Config_1 (n) <-- Config_2 (y) <-- Config_3 (m) After scripts/kconfig/conf Config_1 (n) <-- Config_2 (n) <-- Config_3 (n) I discovered this problem when I ran "make localmodconfig" on a generic Ubuntu config file. Many hardware devices were not recognized once the kernel was installed and booted. Another way to reproduced the error I had is to run "make localmodconfig" twice. The standard error might display warnings that certain modules should be selected but no config files are turned on that select that module. With the changes in this series patch, all modules are loaded properly and all of the hardware is loaded when the kernel is installed and booted. David Hunter (7): linux-kbuild: fix: config option can be bool linux-kbuild: fix: missing variable operator linux-kbuild: fix: ensure all defaults are tracked linux-kbuild: fix: ensure selected configs were turned on in original linux-kbuild: fix: implement choice for kconfigs linux-kbuild: fix: configs with defaults do not need a prompt linux-kbuild: fix: process config options set to "y" --- V2: - Put in subject. V1: - https://lore.kernel.org/all/20240913171205.22126-1-david.hunter.linux@xxxxxxxxx/ --- scripts/kconfig/streamline_config.pl | 77 ++++++++++++++++++++++++---- 1 file changed, 66 insertions(+), 11 deletions(-)
