On Wed, 2014-09-10 at 13:14 -0700, H. Peter Anvin wrote: > On 09/10/2014 12:30 PM, Toshi Kani wrote: > > > > When WT is unavailable due to the PAT errata, it does not fail but gets > > redirected to UC-. Similarly, when PAT is disabled, WT gets redirected > > to UC- as well. > > > > But on pre-PAT hardware you can still do WT.
Yes, if we manipulates the bits directly, but such code is no longer allowed for PAT systems. The PAT-based kernel interfaces won't work for pre-PAT systems, and therefore requests are redirected to UC- on such systems. Thanks, -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
