On Thu, Oct 23, 2014 at 6:52 AM, Roman Gushchin <klamm@xxxxxxxxxxxxxx> wrote: >> That find by Roman discovered that even though NET_DMA was marked >> broken we were still attempting to pin pages for dma offload. > > Not really. Actually I had NET_DMA in my config by mistake. Well, that is material to whether this patch should be applied. I had another report from someone stating that changing the get_user_pages() call to get_user_pages_fast() improved a network performance benchmark by a large margin. We shouldn't be pinning pages at all, so with those two reports I proceeded with deleting rather than mess around with more surgical disabling. Let me take a closer look and put together a smaller patch for -stable. -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html