> 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. +1. If this gets in, I can refresh the rest of the patches in net, mm, ipc, block, etc. and send them for review again. Best Regards, Elena
