On Tuesday 03 June 2008 18:15, Jeremy Higdon wrote: > On Tue, Jun 03, 2008 at 02:33:11PM +1000, Nick Piggin wrote: > > On Monday 02 June 2008 19:56, Jes Sorensen wrote: > > > Would we be able to use Ben's trick of setting a per cpu flag in > > > writel() then and checking that in spin unlock issuing the mmiowb() > > > there if needed? > > > > Yes you could, but your writels would still not be strongly ordered > > within (or outside) spinlock regions, which is what Linus wants (and > > I kind of agree with). > > Yes they would be. Writes from the same CPU are always ordered. Writes > from different CPUs are not, but that's only a concern if you protect They are not strongly ordered WRT writes to cacheable memory. If they were, then they would not leak out of spinlocks. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
