Hardware: cubieboard2, cubietruck, Banana Pi
OS: Armbian, Archlinux with kernel >= 4.12.0 (4.12.x, 4.13.x, 4.14.x)
SoC: A20

Issue description: top shows that kworker constantly eats 8%~13% CPU, 
performance sensitive apps run stuttered, comparing to they behave on 
4.11.x.

I'm using cb2&ct with archlinux, Banana Pi & Armbian are reported on 
Armbian forum, the common ground is A20 SoC, kernels later than 4.12.0, 
considered to be a thermal sensor polling related BUG.

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