Messages in this thread | | | Subject | Re: semantics of dma_map_single() | From | Vineet Gupta <> | Date | Mon, 17 Jul 2017 09:06:29 -0700 |
| |
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
| |