On Tue, 27 May 2008 11:33:46 +1000 Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> wrote: > However, I'm using that as an excuse to bring back my pet subject, > which is basically, should we instead just finally mandate the use of > explicit rmb/wmb/mb's (which boils down to barrier() on x86) to > drivers who want to order memory consistent accesses vs. MMIO ? To me this seems like asking for a long series of weird bugs in drivers. Is the cost of a barrier in an MMIO operation so high that we can't afford to just put them in? Alan's suggestion of no-barrier versions for people who know what they're doing (and who think there's a reason to care) seems like a better way to go to me. jon -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
