Kernel prepatch 4.15-rc8

The 4.15-rc8 kernel prepatch is out fortesting. Among other things, it includes the "retpoline" mechanismintended to mitigate variant 2 of the Spectre vulnerability. Testingof this change will be hard, though, since it requires a version of GCCthat almost nobody has - watch LWN for a full article in the near future."I'm still hoping that this will be the last rc, despite all the Meltdown and Spectre hoopla. But we will just have tosee, it obviously requires this upcoming week to not come with any hugesurprises."