On Thu, Jan 28, 2021 at 08:30:21AM +0800, Qu Wenruo wrote: > >> btrfs: support subpage for extent buffer page release > > > > I don't have this patch in my inbox so I can't reply to it directly, but > > you include refcount.h, but then use normal atomics. Please used the > > actual refcount_t, as it gets us all the debugging stuff that makes > > finding problems much easier. Thanks, > > My bad, my initial plan is to use refcount, but the use case has valid 0 > refcount usage, thus refcount is not good here.
In case you need to shift the "0" you can use refcount_dec_not_one or refcount_inc/dec_not_zero, but I haven't seen the code so don't know if this applies in your case.
