On Sat, Mar 19, 2016 at 06:45:19PM -0700, Linus Torvalds wrote: > It actually does seem to do that, although in an admittedly rather > questionable way. > > I think it should use path_openat() rather than do_filp_open(), but > passing in LOOKUP_RCU to do_filp_open() actually does work: it just > means that the retry after ECHILD/ESTALE will just do it *again* with > LOOKUP_RCU. It won't fall back to non-rcu mode, it just won't or in > the LOOKUP_RCU flag that is already set.
What would make unlazy_walk() fail? And if it succeeds, you are not in RCU mode anymore *without* restarting from scratch...
