On Tue, 26 Jul 2011, Oliver Neukum wrote: > Hi, > > this code made me think: > > /* Give this link TRB to the hardware */ > wmb(); > next->link.control ^= cpu_to_le32(TRB_CYCLE); > > Can you do this or may there be a CPU that speculatively writes before > it reads next->link.control ?
CPUs never do speculative writes. And even if they did, the wmb() would prevent the speculative write from preceding any statement that comes before the memory barrier. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
