On Fri, Mar 20, 2015 at 4:17 PM, Luis R. Rodriguez <mcg...@do-not-panic.com> wrote: > From: "Luis R. Rodriguez" <mcg...@suse.com> > > When a system has PAT support enabled you don't need to be > using MTRRs. Andy had added arch_phys_wc_add() long ago to > help with this but not all drivers were converted over. We > have to take care to only convert drivers where we know that > the proper ioremap_wc() API has been used. Doing this requires > a bit of work on verifying the driver split out the ioremap'd > areas -- and if not doing that ourselves. Verifying a driver > uses the same areas can be hard but with a bit of love Coccinelle > can help with that. > > We're motivated to change drivers for a few reasons: > > 1) Take advantage of PAT when available > > 2) Help with the goal of eventually using _PAGE_CACHE_UC over > _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (de33c442e)
Nice! --Andy _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
