On Tue, Sep 19 2023 at 15:21, Anton Ivanov wrote: > On 19/09/2023 14:42, Peter Zijlstra wrote: >> If you're working on one of them, then surely it's a simple matter of >> working on adding CONFIG_PREEMPT support :-) > > In the case of UML adding preempt will be quite difficult. I looked at > this a few years back. What's so difficult about it? Thanks, tglx