Messages in this thread | | | Date | Thu, 6 Jul 2006 13:32:41 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [patch] spinlocks: remove 'volatile' |
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On Thu, 6 Jul 2006, Chris Friesen wrote: > > As long as you're not talking to external devices, each cpu must be coherent > with respect to itself, no? It's allowed to execute out-of-order, but it > needs to make sure that by doing so it doesn't cause changes that are visible > to software.
Right. But then "volatile" won't really matter either, unless you have some _ordering_ constraint, in which case "volatile" is not enough unless you're guaranteed to be single-threaded.
In other words, again, "volatile" is almost always the wrong thing to have, and just makes you _think_ your code is correct.
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