just curious as to Kconfig style, i noticed the following in drivers/pps/. first, once PPS is selected, the subsequent two config variables predictably "depend" on PPS: menuconfig PPS tristate "PPS support" ---help--- ... snip ... config PPS_DEBUG bool "PPS debugging messages" depends on PPS help ... snip ... config NTP_PPS bool "PPS kernel consumer support" depends on PPS && !NO_HZ_COMMON help ... snip ... obviously, those two dependencies on PPS could be removed and those two config variables could then be wrapped in: if PPS ... endif but with only two config entries, it's like, meh, no big deal, who cares? but that Kconfig file finishes by sourcing two pps subdirs: source drivers/pps/clients/Kconfig source drivers/pps/generators/Kconfig each of which appears to totally depend on PPS; here's the (stripped) clients/ Kconfig file: comment "PPS clients support" depends on PPS config PPS_CLIENT_KTIMER tristate "Kernel timer client (Testing client, use for debug)" depends on PPS config PPS_CLIENT_LDISC tristate "PPS line discipline" depends on PPS && TTY config PPS_CLIENT_PARPORT tristate "Parallel port PPS client" depends on PPS && PARPORT config PPS_CLIENT_GPIO tristate "PPS client using GPIO" depends on PPS same with the pps/generators/Kconfig file. so, rather than all of those "depends on PPS" lines, would it be equivalent to have the top-level Kconfig file just look like: menuconfig PPS tristate "PPS support" if PPS config PPS_DEBUG bool "PPS debugging messages" config NTP_PPS bool "PPS kernel consumer support" depends on !NO_HZ_COMMON source drivers/pps/clients/Kconfig source drivers/pps/generators/Kconfig endif and remove all the lower-level Kconfig "PPS" dependencies? i'm pretty sure that would be equivalent, would it not? or is there some subtlety that prevents that? rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================