On Wed, Dec 16, 2020 at 9:31 AM Stephane ANCELOT <sancelot@xxxxxxxxxxxxxxx> wrote: > > Hi, > > I have downloaded latest LTS kernel 5.4 . > > For unknown reasons, I dont understand why I can't enable full rt preempt, > Well, PREEMPT_RT is not available on v5.4 without the PREEMPT_RT patch set. You can check that there is no architecture support for PREEMPT_RT on the stable kernel. Just look at the Kconfig files defining those config symbols. Lukas
