> From: aarcange@xxxxxxxxxx > > 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. OK, thanks. I shall continue to find another patches. :-) -- Chen Gang Open, share, and attitude like air, water, and life which God blessed ?韬{.n???檩jg???a?旃???)钋???骅w+h?璀?y/i?⒏??⒎???Щ??m???)钋???痂?^??觥??ザ?v???O璁?f??i?⒏?