Re: [PATCH net-next v2 2/4] udmabuf: emit one sg entry per pinned folio

[Jason Gunthorpe]

On Tue, Jun 16, 2026 at 06:04:03AM +0000, Kasireddy, Vivek wrote:

> > This is helpful for importers like net/core/devmem that expect dmabuf sg
> IMO, udmabuf needs to detect whether importers can handle segments that
> are > PAGE_SIZE and set the entries appropriately. Please look into how the
> GPU drivers and other dmabuf exporters/importers handle this situation, so
> that we can adopt best practices to address this issue.

Importers have to handle arbitary scatterlists, devmem is just broken
if it can't handle the output of sg_alloc_table_from_pages().

Jason