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initcall_blacklistparameter appeared in Linux 3.16.<modulename>_init_modulethe canonical name for each and everything that can be built as a module?..._init_moduleor..._module_initbut they don’t all follow those patterns./dev/ramXgeneration at boot, withbrdbuilt-in, viainitcall_blacklist=brd_initkernel command-line parameter, taken from: github.com/torvalds/linux/blob/master/drivers/block/brd.c Withbrd.rd_nr=0there is still/dev/ram0autogenerated.