On Thu, Sep 06, 2018 at 01:46:46PM +0200, Thomas Gleixner wrote: > There are a few things we need to clarify upfront: > > Right now the pre and post vectors are marked managed and their > affinity mask is set to the irq default affinity mask. > > The default affinity mask is by default ALL cpus, but it can be tweaked > both on the kernel command line and via proc. > > If that mask is only a subset of CPUs and all of them go offline > then these vectors are shutdown in managed mode. > > That means we need to set the affinity mask of the pre and post vectors to > possible mask, but that doesn't make much sense either, unless there is a > reason to have them marked managed. > > I think the right solution for these pre/post vectors is to _NOT_ mark > them managed and leave them as regular interrupts which can be affinity > controlled and also can move freely on hotplug. Yes, agreed. Marking the pre/post vector as managed was a mistake (and I don't think it even was intentional, at least on my part).
