Hello, Roman. On Fri, Nov 28, 2014 at 07:47:54PM +0300, Roman Gushchin wrote: > If cgroup_destroy_locked() sets the css refcount to a negative value, > we get an infinite loop in __css_tryget(). > > In this case css_refcnt() returns modified (non-negative value), so > both (t == v) and (t < 0) conditions are always false.
I don't follow. The count is biased and modified by unbiasing iff the value is negative. Here, @v is the unbiased value and @t is the verbatim value. If @v is different from @t due to unbiasing, @t must be negative satisfying the second condition and returning NULL, no? Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
