RE: [RFC][PATCH 2/7] kref: Add kref_read()

From: Reshetova, Elena
Date: Thu Nov 17 2016 - 12:07:56 EST

> Even if we now find all occurrences of atomic_t used as refcounter
> (which we cannot actually guarantee in any case unless someone
> manually reads every line) and convert it to refcount_t, we still have
> atomic_t type present and new usage of it as refount will crawl in. It
> is just a matter of time IMO.

>Improve tooling. The patterns shouldn't be _that_ hard to find. Once the tools are good, new code isn't a problem either.

>Anything: atomic*_{{dec,sub}_and_test,{add,sub}_return,fetch_{add,sub}}
>followed by a call_rcu()/free().

Does not find everything unfortunately. Even if you add to above atomic*_add_unless() and also things like schedule_work(), still I fear we aren't covering everything.
What is worse, I don't think there is a mechanism to guarantee full coverage.