Realtime preemption locking core merged
The 5.15 merge window is off to a fast start; stay tuned for our usual full summary. It is worth mentioning, though, that the realtime preemption locking code has been pulled into the mainline with little fanfare. This work began in 2004 and has fundamentally changed many parts of the core kernel. With this pull, the sleepable locks that make deterministic realtime response possible have finally joined all of that other work (though the kernel must be built with the REALTIME configuration option to use them).

Congratulations are due to all of the realtime developers who pushed this project forward for nearly two decades.