Jesse Barnes writes: > So ultimately mmiowb() is the only thing drivers really have to care > about on Altix (assuming they do DMA mapping correctly), and the rules > for that are fairly simple. Then they can additionally use > read_relaxed() to optimize performance a bit (quite a bit on big > systems).
If I can be sure that all the drivers we care about on PPC use mmiowb correctly, I can reduce or eliminate the barrier in write*, which would be nice. Which drivers have been audited to make sure they use mmiowb correctly? In particular, has the USB driver been audited? Paul. - To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
