* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > It might even be that this is the defined semantics of spin_unlock_wait(). > > As is, spin_unlock_wait() is somewhat ill defined. IIRC it grew from an > optimization by Oleg and subsequently got used elsewhere. And it being the > subtle bugger it is, there were bugs. I believe the historical, original spin_unlock_wait() came from early SMP optimizations of the networking code - and then spread elsewhere, step by step. All but one of the networking uses went away since then - so I don't think there's any original usecase left. Thanks, Ingo
