On Fri, Aug 02, 2024 at 09:32:08PM -0700, Paul E. McKenney wrote: > Huh. One reason for the current smp_call_function_single() in > cpuhp_report_idle_dead() was some ARM32 CPUs that shut down caching on > their way out. this made it impossible to use shared-variable-based > CPU-dead notification. I wonder if Arnd's deprecation schedule > for ARM32-based platforms will allow us to go back to shared-memory > notification, which might make this sort of thing easier. All those idle paths should be doing ct_cpuidle_enter(), which includes telling RCU the CPU is going idle, no? I cleaned all that up a while back.
