On Thu 2016-12-08 11:48:50, Luis R. Rodriguez wrote: > Only decrement *iff* we're possitive. Warn if we've hit > a situation where the counter is already 0 after we're done > with a modprobe call, this would tell us we have an unaccounted > counter access -- this in theory should not be possible as > only one routine controls the counter, however preemption is > one case that could trigger this situation. Avoid that situation > by disabling preemptiong while we access the counter.
I am curious about it. How could enabled preemption cause that the counter will get negative? Unaccounted access would be possible if put() is called without get() or if put() is called before get(). I do not see a way how the value might get negative when the calls are paired and ordered. Best Regards, Petr -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
