Re: [PATCH] New phys_addr() syscall

Alan Cox (alan@lxorguk.ukuu.org.uk)
Sun, 19 Jul 1998 15:28:24 +0100 (BST)

> 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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