On Tue, 2014-06-10 at 23:32 -0400, Peter Hurley wrote: > While rcu list traversal over the vmap_area_list is safe, this may > arrive at different results than the spinlocked version. The rcu list > traversal version will not be a 'snapshot' of a single, valid instant > of the entire vmap_area_list, but rather a potential amalgam of > different list states. > > This is because the vmap_area_list can continue to change during > list traversal.
As soon as we exit from get_vmalloc_info(), information can be obsolete anyway, especially if we held a spinlock for the whole list traversal. So using the spinlock is certainly not protecting anything in this regard. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
