On Fri, Jan 13, 2017 at 07:27:41PM +0530, Balbir Singh wrote: > On Thu, Jan 12, 2017 at 11:30:28AM -0500, Jérôme Glisse wrote: > > When hotpluging memory we want more informations on the type of memory and > > its properties. Replace the device boolean flag by an int and define a set > > of flags. > > > > New property for device memory is an opt-in flag to allow page migration > > from and to a ZONE_DEVICE. Existing user of ZONE_DEVICE are not expecting > > page migration to work for their pages. New changes to page migration i > > changing that and we now need a flag to explicitly opt-in page migration. > > Given that ZONE_DEVICE is dependent on X86_64, do we need to touch all > architectures? I guess we could selectively enable things as we enable > ZONE_DEVICE for other architectures? Yes i need to change all architecture because the function prototype changes. I add the bug stuff to be bullet proof from new feature added that might cause trouble if arch does not handle them explicitly. If the bug stuff scares people i can remove it. Cheers, Jérôme -- 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>