Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> Quoting Mika Kuoppala (2017-09-12 09:36:18)
>> +static inline unsigned int
>> +execlist_active_ports(const struct intel_engine_execlist * const el)
>> {
>> - const unsigned int i = port_index(port, el);
>> + return READ_ONCE(el->port_count);
>
> READ_ONCE? Could we separate the racy check from the serialized uses
> inside the tasklet where we do want the compiler to go to town?
Hmm so substitute execlist_active_ports() in i915_irq.c with
READ_ONCE(el->port_count) and remove it in this function?
-Mika
> -Chris
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