On Wed, Jun 07, 2017 at 07:58:31PM -0700, Kees Cook wrote: > Many subsystems will not use refcount_t unless there is a way to build the > kernel so that there is no regression in speed compared to atomic_t. This > adds CONFIG_REFCOUNT_FULL to enable the full refcount_t implementation > which has the validation but is slightly slower. When not enabled, > refcount_t uses the basic unchecked atomic_t routines, which results in > no code changes compared to just using atomic_t directly. > > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > This is v2 of this patch, which I've split from the arch-specific > alternative implementation for x86. Getting this patch in will unblock > atomic_t -> refcount_t conversion, and the x86 alternative implementation > can be developed in parallel. Changes from v1: use better atomic ops, > thanks to Elena and Peter. Yeah, can we get this in ASAP? Without having to always incur the over this will allow us to convert subsystems to refcount_t broadly.
