Hi, On 27-03-2018 15:46, Sinan Kaya wrote: > > Sinan > "We are being told that if you use writel(), then you don't need a wmb() on > all architectures." > > Alex: > "I'm not sure who told you that but that is incorrect, at least for > x86. If you attempt to use writel() without the wmb() we will have to > NAK the patches. We will accept the wmb() with writel_releaxed() since > that solves things for ARM." > So this means we should always use writel() + wmb() in *all* accesses? I don't know about x86 but arc architecture doesn't have a wmb() in the writel() function (in some configs). I see the point in net drivers while you have dma + io accesses but for most drivers this shouldn't be needed, right? What about ordering of writes? Is it guaranteed that one write will happen before the next one ? Best Regards, Jose Miguel Abreu -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
