On Thu, Jul 27, 2017 at 11:48:53AM -0400, Waiman Long wrote: > atomic_long_sub_return_release() is implmented.
I've not had time to really thing about the problem at hand, but this I can answer: TSO (x86, s390, sparc): fully serialized PPC: lwsync; ll/sc (RCpc) ARM64: ll/sc-release (RCsc) other: smp_mb(); atomic_sub_return_relaxed();
