----- On Nov 28, 2020, at 11:01 AM, Nicholas Piggin npiggin@xxxxxxxxx wrote: > And get rid of the generic sync_core_before_usermode facility. This is > functionally a no-op in the core scheduler code, but it also catches This sentence is incomplete. > > This helper is the wrong way around I think. The idea that membarrier > state requires a core sync before returning to user is the easy one > that does not need hiding behind membarrier calls. The gap in core > synchronization due to x86's sysret/sysexit and lazy tlb mode, is the > tricky detail that is better put in x86 lazy tlb code. Ideally yes this complexity should sit within the x86 architecture code if only that architecture requires it. Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
