![]() | |||||||||||||
Messages in this thread |
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-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2006-03-09 04:50 [W:0.235 / U:0.150 seconds] ©2003-2008 Jasper Spaans | |||||||||||||