On Wed, Jul 01, 2015 at 08:55:57AM +0200, Geert Uytterhoeven wrote: > > > > I think doing this at runtime might be a better idea. E.g. a > > ioremap_flags with the CACHED argument will return -EOPNOTSUP unless > > actually implemented. On various architectures different CPUs or > > boards will have different capabilities in this area. > > So it would be the responsibility of the caller to fall back from > ioremap(..., CACHED) to ioremap(..., UNCACHED)? > I.e. all drivers using it should be changed... All of the zero users we currently have will need to be changed, yes. Note that I propose to leave ioremap(), aka ioremap_flags(..., 0) as a default that always has to work, -EOPNOTSUP is only a valid return value for non-default flaga. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>