vmstat: squash 4 patches from upstream

Partial merge: torvalds/linux@7c8e018
Merge: torvalds/linux@bb0b6df
Merge: torvalds/linux@57c2e36
Partial merge: torvalds/linux@176bed1

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>

Used commit: https://github.com/Noxxxious/Zero/commit/d2aed608a6af202f1799927206b95637627d73fa