On Thu, Mar 22, 2018 at 08:45:11PM +0000, Casey Leedom wrote: > I'm guessing~ that this line in the documentation ~may~ imply the GCC > ordering: > > ... Note that relaxed accesses to > the same peripheral are guaranteed to be ordered with respect to each > other. ... An arch can't guarentee "ordered with respect to each other" without preventing the compiler from re-ordering, so yes, any correct implementation of writel_relaxed must prevent compiler re-ordering. eg with volatile or a compiler barrier, or whatever. > In any case, we really only have a few places where we (the various Chelsio > drivers) need to worry about this: the "Fast Paths" where we have a lot of > I/O to the device. I think we should leave everything else alone. Yes. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
