add swap slot free callback
Add zRam
zRam default configure size
zRam fix some warnings
zRam configure default number of devices
zRam simplify disk resizing interface
zRam set initial disksize
zRam specify default disksize in configuration
zRam 3.2 backport
zRam Snappy Compression
zRam remove extra header
zRam compile error fix
Fix zram build conflict