On Tue, 7 Nov 2023 13:57:33 -0800 Ankur Arora <ankur.a.arora@xxxxxxxxxx> wrote: > With PREEMPTION being always-on, some configurations might prefer > the stronger forward-progress guarantees provided by PREEMPT_RCU=n > as compared to PREEMPT_RCU=y. > > So, select PREEMPT_RCU=n for PREEMPT_VOLUNTARY and PREEMPT_NONE and > enabling PREEMPT_RCU=y for PREEMPT or PREEMPT_RT. > > Note that the preemption model can be changed at runtime (modulo > configurations with ARCH_NO_PREEMPT), but the RCU configuration > is statically compiled. I wonder if we should make this a separate patch, and allow PREEMPT_RCU=n when PREEMPT=y? This could allow us to test this without this having to be part of this series. -- Steve
