On Wed, 2015-06-17 at 11:15 +0100, Will Deacon wrote: > On Wed, Jun 17, 2015 at 10:43:48AM +0100, Andre Przywara wrote: > > Instead of referring to the Linux header including the barrier > > macros, copy over the rather simple implementation for the PowerPC > > barrier instructions kvmtool uses. This fixes build for powerpc. > > > > Signed-off-by: Andre Przywara <andre.przyw...@arm.com> > > --- > > Hi, > > > > I just took what kvmtool seems to have used before, I actually have > > no idea if "sync" is the right instruction or "lwsync" would do. > > Would be nice if some people with PowerPC knowledge could comment. > > I *think* we can use lwsync for rmb and wmb, but would want confirmation > from a ppc guy before making that change!
Ugh, memory barriers :) You probably can use lwsync, assuming you're only ordering cacheable vs cacheable. But, lwsync has given us pain in the past[1], so I'd be happier if you just used sync. cheers [1]: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51d7d5205d3389a32859f9939f1093f267409929 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
