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SubjectRe: [patch 21/26] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console
Ingo Molnar wrote:
>> + prod = intf->in_prod;
>> + mb();
>> + BUG_ON((prod - cons) > sizeof(intf->in));
> such mb()'s are typically a sign of "i have no clear idea what SMP
> serialization rules apply here, but something is needed because
> otherwise it breaks" ?

Hm, in this case its because it's sharing the memory with Xen, so
there's a particular ordering protocol. It needs some comments.


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