On Thu, Oct 29, 2020 at 3:32 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > > Though I wanted to share the current state of affairs before investigating > that further. If there is consensus in going forward with this, I'll have a > deeper look into this issue. Me likee. I think this looks like the right thing to do. I didn't actually apply the patches, but just from reading them it _looks_ to me like you do the migrate_disable() unconditionally, even if it's not a highmem page.. That sounds like it might be a good thing for debugging, but not necessarily great in general. Or am I misreading things? Linus