On Wed, Dec 16, 2020 at 9:39 AM Stephane ANCELOT <sancelot@xxxxxxxxxxxxxxx> wrote: > > > Le 16/12/2020 à 09:36, Lukas Bulwahn a écrit : > > 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. > Sorry, I thought it was now part of the mainstream kernel. I have not > understand :-\ PREEMPT_RT will be part of mainline on Christmas, we simply do not know which Christmas yet... maybe on the next one? If you rely on real-time Linux being in mainline, we can discuss off-list which possibilities you have to ensure that that happens. Lukas