FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit c00ed16a9eb98a7fc076e227bdd95c1451ca1e6e ("zswap: runtime enable/disable")

The following new message in kernel log may make end user confusing:

[    5.296308] zswap: loading zswap
[    5.299289] zpool: creating pool type zbud
[    5.302081] zpool: no driver for type zbud
[    5.310432] zswap: zbud zpool not available
[    5.313658] zswap: zpool creation failed

Thanks,
Ying Huang