I was looking up if zram was avaliable in 4.0. I found something that said it wasn't available in 4.0 but was in earlier versions, but I don't understand why. So far I found.

1. There is a zram kernel object present in the default system.
2. regardless of if udisk2s-zram is installed, modprobing zram never mounts a zram disk.
3. I noticed in the sysvinit script that is provided by debian wiki, the script calls for modinfo from kmod. modinfo seems to be called with /sbin/modinfo, or it could be copied to /bin/ to make it work normally. However, modinfo always outputs an ERROR saying it's missing firmware. I read somewhere that you should install linux-headers, but this did not change/fix the error. So I'm assuming this is a separate problem.

So regardless of the modinfo bit. Why can't we just have zram working on the current kernel? Is there something hugely different in 4.0?