Andriy Gapon d0a9542494 fix up r353340, don't assume that fcmpset has strong semantics ... fcmpset can have two kinds of semantics, weak and strong. For practical purposes, strong semantics means that if fcmpset fails then the reported current value is always different from the expected value. Weak semantics means that the reported current value may be the same as the expected value even though fcmpset failed. That's a so called "sporadic" failure. I originally implemented atomic_cas expecting strong semantics, but many platforms actually have weak one. Reported by: pkubaj (not confirmed if same issue) Discussed with: kib, mjg MFC after: 19 days X-MFC with: r353340		2019-10-11 17:01:02 +00:00
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kern	emulate illumos membar_producer with atomic_thread_fence_rel	2019-10-10 07:39:41 +00:00
rpc
sys	fix up r353340, don't assume that fcmpset has strong semantics	2019-10-11 17:01:02 +00:00