BTW.:
The v5 workaround code not only is less efficient (doing busy
splinocks), it also creates potential deadlocks in certain cases
(realtime priority), is not 100% secure and it might be that certain
chips even fail handling the swap instruction atomicly and thus the code
will not work at all.
Thus, IMHO, basing the userland part of Futex on this is not recommended.
The "common" Linux functions are guaranteed to work decently (with
Kernel support if necessary) and always are as fast as possible.
-Michael
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