Hi Christoph, On 07/16/2017 11:42 PM, Christoph Hellwig wrote: > I would expect that it would support any contiguous range in > the kernel mapping (e.g. no vmalloc and friends). But it's not > documented anywhere, and if no in kernel users makes use of that > fact at the moment it might be better to document a page size > limitation and add asserts to enforce it. My first thought was indeed to add a BUG_ON for @size > PAGE_SIZE (also accounting for offset etc), but I have a feeling this will cause too many breakages. So perhaps it would be better to add the fact to Documentation that it can handle any physically contiguous range. -Vineet
