On Mon, Nov 06, 2006 at 03:33:19PM -0500, Ramkrishna Vepa wrote: > The 64 bit io operation on the IA64 platform is a 64 bit transaction on > the pci bus and is optimal to leave it as such. I prefer Jeff's > suggestion - > > guaranteeing that a "good enough for drivers" readq() and writeq() exist > on all platforms even 32-bit platforms where the operation isn't > inherently atomic.
For consistencies sake we really want to have readq() and writeq() available on all platforms. I remember that some IB cards require it to actually be a 64bit transactions, otherwise they have to do funny workarounds. I think the best solution is to define ARCH_HAS_ATOMIC_READQ_WRITEQ and let drivers do their workarounds based on that. I've Cc'ed Roland because he should be able to explain the IB issue in details. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
