[Intel-gfx] [PATCH 8/8] drm/i915: Keep track of reserved execlist ports

[Chris Wilson]

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?
-Chris