On Fri, Sep 01, 2017 at 11:50:03PM +0200, Peter Zijlstra wrote: > > Did you read the other other part of the description? > > > > Further, both functions can be used to accurately trace the refcount > > (refcount_inc() followed by refcount_read() can't be considered > > accurate). > > I must admit to having overlooked that. But can we treat the two issues > separately? They are quite distinct. So for tracing purposes inc_return/dec_return don't cover the full set. In particular: inc_not_zero, dec_not_one and dec_and_*lock are not covered. dec_if_one I suppose we only care about the success case, in which case we knew it was one by inference.
