> Outside of hard realtime code, there's zero reason to use spin locks. That is just not true. You _must_ use them in the case where the kernel is non-preempt

> Outside of hard realtime code, there's zero reason to use spin locks. That is just not true. You _must_ use them in the case where the kernel is non-preemptable. Additionally, if the locked resource is held for a very short time, a spin lock is likely a more efficient choice than a traditional mutex.