On Tue, Oct 01, 2019 at 09:16:23AM -0300, Jason Gunthorpe wrote: > > If the virtual address obtained from ioremap() is not > > backed by a page struct, virt_to_page() returns an > > invalid page pointer. However, sg_copy_buffer() can > > correctly recover the original virtual address. Such > > addresses can successfully be assigned to scatterlist > > segments to transfer data across the PCI bus with > > sg_copy_buffer() if it were not for the crash in > > PageSlab() when called by sg_miter_stop(). > > I thought we already agreed in general that putting things that don't > have struct page into the scatter list was not allowed?
Yes, that absolutely is the case.
