On 09/10/2014 02:27 PM, Andy Lutomirski wrote: >> >> That's possible, but the only benefit is that we can enable WT on >> pre-PAT systems, which I do not think anyone cares now... WB & UC work >> on pre-PAT systems. WC & WT need PAT. I think this requirement is >> reasonable. > > It might end up being a cleanup, though. A whole bunch of > rarely-exercised if (!pat_enabled) things would go away. > Yes. Don't think of it as PAT vs non-PAT. Think of it as a specific set of cache types available on different processors. The fact that you may have to frob an MSR to initialize it is almost trivial in comparison. -hpa -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>