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
