On Mon, 2015-08-24 at 14:21 -0400, Alan Stern wrote: > > In theory, an architecture could implement atomic bit operations > using > > a spinlock to insure atomicity. I don't know if any architectures > do > > this, but if they do then the scenario above could arise. > > Now that I see this in writing, I realize it's not possible after > all. > clear_bit() et al. will work with a single unsigned long, which > doesn't > leave any place for spinlocks or other mechanisms. I was thinking of > atomic_t. Refuting yourself you are making the assumption that the lock has to be inside the data structure. That is not true. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
