[PATCH 09/10] arch: introduce memremap()

[Dan Williams]

On Wed, Jul 22, 2015 at 5:55 PM, Luis R. Rodriguez <mcgrof at suse.com> wrote:
> On Wed, Jul 22, 2015 at 04:15:41PM -0700, Dan Williams wrote:
> Anyway so why is WB and WT allowed if you are going to remove WC and not add UC?
>

Because all existing usages of WB and WT mappings are clearly free of
I/O side effect concerns.  The WC and now UC usages are a muddy mix of
"sometimes there's I/O side effects, but it depends by arch and
driver".