On June 19, 2025 5:32:26 AM EDT, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: >On Thu, Jun 19, 2025 at 05:07:10AM -0400, Steven Rostedt wrote: > >> Does #DB make in_nmi() true? If that's the case then we do need to handle that. > >Yes: #DF, #MC, #BP (int3), #DB and NMI all have in_nmi() true. > >Ignoring #DF because that's mostly game over, you can get them all >nested for up to 4 (you're well aware of the normal NMI recursion >crap). We probably can implement this with stacked counters. >Then there is the SEV #VC stuff, which is also NMI like. So if you're a >CoCo-nut, you can perhaps get it up to 5. The rest of the tracing infrastructure goes 4 deep and hasn't had issues, so 4 is probably sufficient. -- Steve
