I just found out that you can add efi=runtime
to the kernel command line if you need efivarfs using rt kernels. It is documented in https://docs.kernel.org/core-api/real-time/kernel-configuration.html that CONFIG_PREEMPT_RT also sets CONFIG_EFI_DISABLE_RUNTIME because calling into EFI can cause significant latency spikes. Best regards Jan -- Jan Dittberner - Debian Developer GPG-key: 4096R/0xA73E0055558FB8DD 2009-05-10 B2FF 1D95 CE8F 7A22 DF4C F09B A73E 0055 558F B8DD https://portfolio.debian.net/ - https://people.debian.org/~jandd/
