Re: [PATCH] KVM: selftests: Double check on the current CPU in rseq_test

Paolo Bonzini
2022-07-14T15:42:39Z

On 7/14/22 17:35, Sean Christopherson wrote:
>> Can you check that smp_rmb() and smp_wmb() generate correct instructions on
>> arm64?
>
> That seems like the most likely scenario (or a kernel bug), I distinctly remember
> the barriers provided by tools/ being rather bizarre.

Maybe we should bite the bait and use C11 atomics in tools/. I've long
planned an article "C11 atomics for kernel programmers", especially
because this will also be an issue when Rust gets into the mix...

Paolo