Messages in this thread | | | From | (Alan Cox) | Subject | Re: [PATCH] New phys_addr() syscall | Date | Sun, 19 Jul 1998 15:28:24 +0100 (BST) |
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> People writing pure userspace network drivers may also find this handy > if they want to DMA directly into userspace.
It doesnt help. You have locking and copy/write issues to worry about for the DMA case. This seems an extremely fringe and bizarre syscall to consider for general use!
There was a nice DMA to user space patch for 2.1.8x or so that worked well but Linus disliked (slow set up time). Nobody ever produced a better one or needed a fast set up time however
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