On Wed, 2017-08-02 at 00:59 +0200, Peter Zijlstra wrote: > > PowerPC for example uses PTESYNC before the TBLIE, so does a SYNC after > > work? Ben? > > From what I gather it is not. You have TLBSYNC for it. So the good news
tlbsync is pretty much a nop these days. ptesync is a strict superset of sync and we have it after every tlbie. > is that PPC-radix does all that and is fully serialized on the tlb > flush. Not sure for the PPC-hash case. > > At the same time, smp_mb() is not sufficient on ARM either, they need a > DSB barrier on both ends. > > So are we going to mandate tlb flush implementations are completely > ordered ? Cheers, Ben.
