This introduces a new unit condition check: that matches if a specific kmod module is allowed. This should be generally useful, but there's one usecase in particular: we can optimize modprobe@.service with this and avoid forking out a bunch of modprobe requests during boot for the same kmods. Checking if a kernel module is loaded is more complicated than just checking if /sys/module/$MODULE/ exists, since kernel modules typically take a while to initialize and we must check that this is complete (by checking if the sysfs attr "initstate" is "live").
System and Service Manager
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