[PATCH v6 4/4] Avoid extra load with CAS in __pthread_mutex_clocklock_common [BZ #28537]

[Florian Weimer]

* Arjan van de Ven via Libc-alpha:

> what exactly is the stable branch policy that would suggest to
> backport performance improvements like this ?  (most projects are
> sticking to "strict bugfixes and other gross oversights" as much as
> possible)

We occasionally backport safe (and not-so-safe) performance
optimizations.  We draw the line at ABI changes, those aren't possible.
It's also very desirable that all future releases have a superset of the
backports.

But anything else depends on who is willing to do the work.

Thanks,
Florian