Messages in this thread | | | Date | Wed, 12 Jul 2006 23:01:03 -0700 (PDT) | From | Dave Olson <> | Subject | Re: [PATCH 38 of 39] IB/ipath - More changes to support InfiniPath on PowerPC 970 systems |
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On Thu, 6 Jul 2006, Benjamin Herrenschmidt wrote:
| On Thu, 2006-07-06 at 16:34 -0700, Bryan O'Sullivan wrote: | > On Fri, 2006-07-07 at 08:37 +1000, Benjamin Herrenschmidt wrote: | > | > > > +int ipath_unordered_wc(void) | > > > +{ | > > > + return 1; | > > > +} | > > | > > How is the above providing any kind of serialisation ? | > | > It's not intended to; it tells the *caller* whether to do it. | | Ah ok. What barrier do you use for that ?
on x86_64, the sfence instruction, on others, wmb(), in the kernel. In user-land, pretty much the same underlying assembly instructions.
Dave Olson olson@unixfolk.com http://www.unixfolk.com/dave - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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