Hello, this is about testing if a kernel has been compiled with PREEMPT_RT. Previously, the PREEMPT_RT patch created a file /sys/kernel/realtime to enable user space tools to detect this. However, this patch has not been merged (yet?). The commit which creates this file is 3e7545de923c4e8184c2be0b95341fdc7ef1c193 as pointed out in thread [1] on the LinuxCNC forum. Many applications in the robotics space also use the existence of this file to check for PREEMPT_RT such as [2],[3]. My question is if this will be merged later on or the user space will have to accomodate this change. Cheers, Alex [1] https://forum.linuxcnc.org/38-general-linuxcnc-questions/54542-real-time-kerel-not-detected-on-patched-6-12?start=10 [2]https://github.com/ros-controls/realtime_tools/blob/5b85370c75371a5748b790101802910e53bb12f0/src/realtime_helpers.cpp#L48 [3] https://github.com/frankaemika/libfranka/blob/fd2951bc76e61d32d835241c40c26562148cd457/src/control_tools.cpp#L29
