On 11/4/21 15:18, Sean Christopherson wrote:
If I'm interpeting Paolo's suggestion
correctly, he's pointing out that oustanding stores to the function pointers in
@cbs need to complete before assigning a non-NULL pointer to perf_guest_cbs,
otherwise a perf event handler may see a valid pointer with half-baked
callbacks.
I think smp_store_release() with a comment would be appropriate, assuming my
above interpretation is correct.
Yes, exactly. It should even be rcu_assign_pointer(), matching the
synchronize_rcu() in patch 1 (and the change can be done in patch 1, too).
Paolo
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