On 11/5/06, Roland Dreier <[EMAIL PROTECTED]> wrote: > > I have mentioned this to Ralph in the past, just want to get ack/nak > > on that from you: also on 64bit arch a block driver (eg SCSI LLD eg > > SRP/iSER/etc) might get from higher level an SG whose pages are > > **not** mapped into the kernel virtual address space. For example this > > can happen with Direct I/O. > > No, I don't see how that could happen. Aren't all pages always mapped > by the the kernel direct mapping on 64-bit architectures?
I don't know exactly how this happens, but one of the comments i've got from Christoph on the iser code, is that one can't assume page_address(sg[i].page) will not be NULL for SG passed to a SCSI LLD, i think Direct I/O is one flow where this might happen. Or. _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
