Hello Chen, On Sun, Oct 04, 2015 at 12:55:29PM +0800, Chen Gang wrote: > Theoretically, the lock and unlock need to be symmetric, if we have to > lock f_mapping all firstly, then lock all anon_vma, probably, we also > need to unlock anon_vma all, then unlock all f_mapping.
They don't need to be symmetric because the unlocking order doesn't matter. To avoid lock inversion deadlocks it is enough to enforce the lock order. -- 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/
