membarrier-rs
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Test sys_membarrier
Travis CI doesn't support Linux 4.14+, so we cannot properly test --features linux_membarrier in Travis.
They support Ubuntu 14.04, and it seems they have no plan to upgrade the Linux image: https://github.com/travis-ci/travis-ci/issues/5821
We can't do much about this, but a fallback for older Linux kernels (see #3) would at least make tests run on Linux.
Not much to do here. At least now tests pass on Travis. Close the issue?
I changed the issue name to reflect my intention more clearly. IMO, the issue here is that our CI doesn't test sys_membarrier at all...