On Fri, May 22, 2020 at 11:44:07AM +0200, Peter Zijlstra wrote: > On Thu, May 21, 2020 at 05:38:50PM -0700, Paul E. McKenney wrote: > > Hello! > > > > Just wanted to call your attention to some pretty cool and pretty serious > > litmus tests that Andrii did as part of his BPF ring-buffer work: > > > > https://lore.kernel.org/bpf/20200517195727.279322-3-andriin@xxxxxx/ > > > > Thoughts? > > I find: > > smp_wmb() > smp_store_release() > > a _very_ weird construct. What is that supposed to even do? Indeed, it looks like one or the other of those is redundant (depending on the context). Also, what use is a spinlock that is accessed in only one thread? Finally, I doubt that these tests belong under tools/memory-model. Shouldn't they go under the new Documentation/ directory for litmus tests? And shouldn't the patch update a README file? Alan
