On Tue, 2018-04-24 at 04:15:54 UTC, Michael Ellerman wrote: > From: Michal Suchanek <msucha...@suse.de> > > A no-op form of ori (or immediate of 0 into r31 and the result stored > in r31) has been re-tasked as a speculation barrier. The instruction > only acts as a barrier on newer machines with appropriate firmware > support. On older CPUs it remains a harmless no-op. > > Implement barrier_nospec using this instruction. > > mpe: The semantics of the instruction are believed to be that it > prevents execution of subsequent instructions until preceding branches > have been fully resolved and are no longer executing speculatively. > There is no further documentation available at this time. > > Signed-off-by: Michal Suchanek <msucha...@suse.de> > Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Series applied to powerpc next. https://git.kernel.org/powerpc/c/a6b3964ad71a61bb7c61d80a60bea7 cheers