Messages in this thread | | | Subject | Re: [PATCH v2 6/6] x86, pat: Update documentation for WT changes | From | Toshi Kani <> | Date | Wed, 10 Sep 2014 15:34:55 -0600 |
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On Wed, 2014-09-10 at 13:29 -0700, Andy Lutomirski wrote: > On Wed, Sep 10, 2014 at 1:12 PM, Toshi Kani <toshi.kani@hp.com> wrote: > > On Wed, 2014-09-10 at 11:30 -0700, Andy Lutomirski wrote: > >> On Wed, Sep 10, 2014 at 9:51 AM, Toshi Kani <toshi.kani@hp.com> wrote: > >> > +Drivers may map the entire NV-DIMM range with ioremap_cache and then change > >> > +a specific range to wt with set_memory_wt. > >> > >> That's mighty specific :) > > > > How about below? > > > > Drivers may use set_memory_wt to set WT type for cached reserve ranges. > > Do they have to be cached?
Yes, set_memory_xyz only supports WB->type->WB transition.
> How about: > > Drivers may call set_memory_wt on ioremapped ranges. In this case, > there is no need to change the memory type back before calling > iounmap. > > (Or only on cached ioremapped ranges if that is, in fact, the case.)
Sounds good. Yes, I will use cashed ioremapped ranges.
Thanks, -Toshi
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