> What I mean is: this whole series is almost certainly a performance > regression, it has no off switch, and is doesn't obviously solve any problem. > It' didn't qualify as a so. And no one has benchmarked it. I think we > should seriously consider just not applying it.
Well it's kernel hardening to guard against possible future speculation attacks. Linus discussed it here for example: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1580667.html For the on/off switch I can add a CONFIG to enable it, even though it seems somewhat silly. -Andi
