On Fri, 26 Jul 2024, Ankur Arora wrote:

However, recent changes in poll_idle() mean that a higher level
primitive -- smp_cond_load_relaxed() is used for polling. This would
in-turn use cpu_relax() or an architecture specific implementation.

Maybe explain here that smp_cond_load_relaxed will potentially wait for 
important events such as a cacheline changing. Thereby making the busy 
poll unnecessary and optimizing power use.