Re: [PATCH] video: fbdev: atyfb: only use ioremap_uc() on i386 and ia64

[Luis Chamberlain]

On Wed, Nov 13, 2019 at 11:31:54AM +0200, Andy Shevchenko wrote:
> On Wed, Nov 13, 2019 at 08:38:15AM +0100, Arnd Bergmann wrote:
> > On Wed, Nov 13, 2019 at 8:27 AM Christoph Hellwig <hch@xxxxxx> wrote:
> > >
> > > On Tue, Nov 12, 2019 at 10:24:23PM +0000, Luis Chamberlain wrote:
> > > > I think this would be possible if we could flop ioremap_nocache() to UC
> > > > instead of UC- on x86. Otherwise, I can't see how we can remove this by
> > > > still not allowing direct MTRR calls.
> > >
> > > If everything goes well ioremap_nocache will be gone as of 5.5.
> > 
> > As ioremap_nocache() just an alias for ioremap(), I suppose the idea would
> > then be to make x86 ioremap be UC instead of UC-, again matching what the
> > other architectures do already.
> 
> I think it's right thing to do, i.e. assume that ioremap() always does strong
> UC independently on MTRR settings.

Agreed wholeheartedly. What are the blockers from making that happen? Do
we have any left?

  Luis