On Tue, Mar 27, 2018 at 09:46:51AM -0400, Sinan Kaya wrote: > On 3/27/2018 7:02 AM, Will Deacon wrote: > > - See Documentation/DMA-API.txt for more information on consistent memory. > > + can see it now has ownership. Note that, when using writel(), a prior > > + wmb() is not needed to guarantee that the cache coherent memory writes > > + have completed before writing to the MMIO region. The cheaper > > + writel_relaxed() does not provide this guarantee and must not be used > > + here. > > Can we say the same thing for iowrite32() and iowrite32be(). I also see wmb() > in front of these. I don't think so. My reading of memory-barriers.txt says that writeX might expand to outX, and outX is not ordered with respect to other types of memory. Will -- 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
