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 14:12:13 -0600 |
| |
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.
> It's also not all that informative. Are you supposed to set the > memory back before iounmapping?
Setting back to WB before iounmap is not required, but set_memory_wb is used when it wants to put it back to WB before unmapping.
> Can you do this with set_memory_wc on > an uncached mapping?
The table lists interfaces and their intended usage. Using set_memory_wc on an uncached mapping probably works, but is not an intended use.
Thanks, -Toshi
| |