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On Sat, 2006-07-08 at 13:18 +0300, Avi Kivity wrote: > I didn't suggest the compiler could or should do it, just that it would > be possible (for the _user_) to write portable ISO C code to access PCI > mmio registers, if volatile's implementation serialized access. And how is this portable on complex multibus architectures, where the PCI access goes through a couple of transports before hitting the PCI hardware ? volatile has no notion of serialization. volatile guarantees that the compiler does not optimize and cache seemingly static values, i.e. it disables compiler optimizations. tglx - 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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