On Sun, Sep 09, 2018 at 02:55:54PM +0200, Greg KH wrote:

> There are other examples of this, spectre fixes for arm32 are not in any
> stable tree older than 4.18.y.  Same for other arches and kernel
> versions.

Not really relevant to your point but just for clarity those should make
it back to the LTS versions at some point for arm32, they've been held
up behind some of the other entertaining backports.  Which is itself an
issue but there we are.