On 16/3/07 11:41, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: >> It's needed for writing data /after/ reading the consumer index that shows >> you have space to write. Looking through xenbus_comms.c I think all the >> barriers are correct except there is a spurious extra mb() in xb_read(), >> where there is a later rmb() which is sufficient by itself. All the others >> have a purpose. >> > > If Ingo couldn't work this out from reading the code then nobody else can, > and we have a maintainability problem which can only be solved with > adequate commenting. Agreed. I've fixed up the commenting, removed the spurious mb(), and I just need Jeremy to merge that change into the Xen pv_ops patchset. :-) -- Keir _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxx https://lists.osdl.org/mailman/listinfo/virtualization
